TECHNICAL INFORMATION CVA 406x Coffee Systems

Transcription

1 TECHNICAL INFORMATION CVA 406x Coffee Systems 2012 Miele USA

2 Table of Contents CVA 4062/CVA 4066/CVA 4068 Coffee Systems A Warning and Safety Instructions General Risk of Burning or Scalding Touch Current Measurement Plumbing Information Before the First Use Cleaning in the Dishwasher B Modification History C Technical Data D Component Layouts Front View Interior View Electrical Components CVA 4062, CVA CVA Housing Service Removing the Appliance from a Cabinet Installation Installation Procedure Adjusting the Door Hinges Exterior Side Panels Door Inner Panel Coffee/Hot-Water Dispenser Function Adjusting the Dispenser Height Fault Repair Coffee or Espresso Too Cold Milk Froth Unsatisfactory or Sputtering Door Outer Panel, Control/Display Electronic Function Optical Interface (MDU) Control/Display Electronic EPWZ (N5) Touch Controls Fault Repair Diagnostic Support Cannot Establish a Connection RemoteVision InfoControl: Incorrect Language Set RemoteVision InfoControl: Time of Day Setting Varies RemoteVision InfoControl: Buzzer Inoperative RemoteVision InfoControl: Data Transfer Interference RemoteVision InfoControl: Mobile Receiver Display Faulty Machine Runs Automatically and Chirps When the Door is Opened Service Control/Display Electronic EPWZ (N5) Removal

3 4.2 Dispenser Present Switch (S87/6) Removal Dispensing Area Light (1H3, 2H3) Removal Door Removal Drive, Brew Unit Function Brew Unit Control Microswitch Locations Electronic Grind Amount Compensation Brew Unit Drive, Home Position Brew Unit Drive, Compressing Position (Brew Position) Brew Unit Drive, Drain Position Fault Repair Coffee Grounds Next to the Brew Unit Service Brew Unit Drive (M26) Removal Removing the Grind Amount Compensation Microswitch (S51/4) Removing the Brew Unit Position Microswitches (S60/1, S60/2) Grinder Function Adjusting the Grinder Setting Filling Ground Coffee Service Grinder (M25) Removal Flow-Thru Heaters Function Steam System Service Removing the Coffee/Hot Water Heater (2R1) Removing the Temperature Limiter, Fuse, Temperature Sensor from the Coffee/Hot-Water Heater Removing the Steam Heater (1R1) Removing the Temperature Limiter, Temperature Sensor, Fuse from the Steam Heater Pumps, Solenoids, Flow Meters Function Water Paths Overview Water Path Coffee Water Path Hot Water Water Path Hot Milk Water Path Milk Froth Service Hot-Water Solenoid (Y61) Removal Rinsing Solenoid (Y62) Removal Coffee/Hot Water Pump (2M7) Removal Steam Pump (1M7) Removal Flow Meter (B3/4) Removal Decompression Vessel Removal Ceramic Valve Removal Containers, Drip Tray, Accessories

4 2 Function Water Tank Filling the Water Tank Manually Filling the Water Tank Automatically Filling the Water Tank (CVA 4066 Models Only) Filling the Beans Container Fault Repair Milk Container Not Registered as Empty Milk Container Present But Not Registering Service Rinsing the Milk Pipework Cleaning the Milk Pipework Cleaning the Stainless-Steel Milk Container Descaling the Appliance Electronic Modules Function Machine Response after Power Supply Interruption Software IDs Fault Repair F1 -- Coffee/Hot Water NTC (2R30) Short-Circuited F2 -- Coffee/Hot Water NTC (2R30) Open-Circuited F3 -- Steam NTC (1R30) Short-Circuited F4 -- Steam NTC (1R30) Open-Circuited F10 -- No Water Intake F17 -- Insufficient Water Intake F28 -- Too Much Ground Coffee in Brew Unit F41 -- EEPROM Faulty/Data Fault F42 -- Line Frequency Not Registered F47 -- No Communication Between Control and Power Electronics F73 -- Brew Unit Fault F74 -- Ceramic Valve Fault F76 -- Fault during Pressing in Brew Unit F77 -- Ceramic Valve Initialization Fault F80 -- Coffee/Hot Water Heater (2R1) Not Heating F81 -- Steam Heater (1R1) Not Heating F82 -- Coffee/Hot Water Heater (2R1) Overheating F83 -- Steam Heater (1R1) Overheating F94 -- Water Intake Fault "Replace Drip Tray" Message, Even Though Drip Tray Is Inserted "Empty Drip Tray" Message, Even Though Drip Tray Is Not Full "X Servings until Descaling" Shown in Display Empty Waste Container Message, But Waste Container Is Not Full Clean Brew Unit Message Not Displayed Descaling Is Interrupted Fit Jets in Central Spout Message Displayed Fit Cover over Central Spout Message Displayed Service Customer Programming Mode Service Programming Mode Service Mode Power Electronic EPL (N4) Removal

5 080 Water Intake (CVA 4066 Only) Function Plumbed Water Line (CVA 4066 Only) Safety Concept for Water Intake Service Water Inlet Filter Removal Water Inlet Valve (1Y63, 2Y63) Removal Technical Service Bulletins Some CVAs May Experience a Power Electronic TRIAC Failure The Display Clock on Models CVA 4062 and CVA 4066 May Change Time Unexpectedly CVA & French Roast Coffee CVA Water Tank Cleaning CVA 4062 & CVA 4066 Milk Pipework Conversion CVA Door Hose Replacement CVA Replacement Coffee Grinders CVA 406X Hot Milk Temperatures Understanding CVA 40xx Temperature Fuses CVA 406x & MDU Updates List of Figures Figure A-1: Compression Fitting... 9 Figure D-1: Front View of Appliance Figure D-2: Interior View of Appliance Figure D-3: CVA 4062, CVA 4068 Component Layout Figure D-4: CVA 4066 Component Layout Figure 010-1: Removing the Appliance from a Cabinet Figure 010-2: CVA 4066 Plumbing Figure 010-3: CVA Feet Adjustment Figure 010-4: CVA Mounting Locations Figure 010-5: Door Hinge Adjustment Figure 021-1: Dispenser Height Adjustment Figure 025-1: Optical Interface for Diagnostic Support and Program Updating Figure 025-2: Right and Central Covers Figure 025-3: Hose and Wire Connections Figure 025-4: Main Dispenser Retaining Screws Figure 025-5: Control/Display Electronic Cover and Power Electronic Connection Figure 025-6: Control/Display Electronic Connections Figure 025-7: Door Hinge Screws Figure 030-1: Brew Unit Microswitches Figure 030-2: Brew Unit Switching Cam, Ground Quantity Compensation Microswitch. 37 Figure 030-3: Measurable Volume Areas 1, 2 and Figure 030-4: Selectable Volume Areas 1, 2 and Figure 030-5: Home Position, Rear View Figure 030-6: Home Position, Front View Figure 030-7: Compressing Position, Rear View Figure 030-8: Compressing Position, Front View Figure 030-9: Drain Position, Rear View

6 Figure : Drain Position, Front View Figure : Service Door Screws Figure : Service Door Open Figure : Brew Unit Removal Figure : Brew Unit Drive Retaining Screws Figure 040-1: Grinder Adjustment Figure 040-2: Ground Coffee Funnel and Lid Figure 040-3: Service Door Screws Figure 040-4: Service Door Open Figure 040-5: Bean Container Guide Retaining Screws Figure 040-6: Adjustment Lever Handle Figure 040-7: Grinder Retaining Screws Figure 050-1: Service Door Screws Figure 050-2: Service Door Open, Showing Heaters Figure 050-3: Coffee/Hot Water Heater Figure 050-4: Temperature-Regulating Components on Coffee/Hot Water Heater Figure 050-5: Temperature-Regulating Components on Coffee/Hot Water Heater Figure 050-6: Service Door Screws Figure 050-7: Service Door Open, Showing Heaters Figure 050-8: Steam Heater and Bracket Figure 050-9: Temperature-Regulating Components on Steam Heater Figure : Temperature-Regulating Components on Steam Heater Figure 051-1: CVA Water Path - Overview Figure 051-2: Coffee Water Path Figure 051-3: Hot-Water Path Figure 051-4: Hot-Milk Path Figure 051-5: Milk Froth Path Figure 051-6: Support Plate Retaining Screws Figure 051-7: Rinsing and Hot-Water Solenoids Figure 051-8: Hot-Water Solenoid Figure 051-9: Support Plate Retaining Screws Figure : Rinsing and Hot-Water Solenoids Figure : Rinsing Solenoid Figure : Service Door Screws Figure : Service Door Open Figure : Coffee/Hot Water and Steam Pumps Figure : Coffee/Hot Water Pump Figure : Steam Pump Figure : Flow Meter Figure : Flow Meter (1) and Plastic Support (2) Figure : Decompression Vessel and Ceramic Valve Figure : Ceramic Valve, Removed from Machine Figure 060-1: Pull Door Open Figure 060-2: Pull Water Tank Out Figure 060-3: Setting Water Fill to Automatic, Step Figure 060-4: Setting Water Fill to Automatic, Step Figure 060-5: Beans Container Figure 070-1: Brew Unit Positioning Microswitches Figure 070-2: Brew Unit Guide

7 Figure 070-3: Power Electronic Retaining Screws Figure 080-1: Brass Elbow Location Figure 080-2: Service Door Retaining Screws Figure 080-3: Water Inlet Valves List of Tables Table C-1: Technical Data Table 030-1: Switch Cam Settings Table 070-1: Software IDs Table 070-2: X Servings until Descaling versus Water Hardness Table 070-3: Customer Programming Settings Table 070-4: Service Programming Settings Table 070-5: Service Mode Table 070-6: Brew Unit Positions

8 A Warning and Safety Instructions CVA 4062/CVA 4066/CVA 4068 Coffee Systems 1 General Any repairs or maintenance performed by unqualified personnel could be dangerous. All applicable laws, codes, regulations, and accident prevention guidelines must be observed when serving, modifying, testing or maintaining appliances. All repairs should be performed by a trained technician in strict accordance with local, state and national codes. Before any service work is started, the machine must be safely disconnected from its power source. Even with the machine switched off, voltage may exist on some components. After work has been completed, as a matter of standard practice, a visual as well as an operational check should be performed. Note: Prior to starting service or repair work, remove all containers and the drip tray with the spill guard grid from the appliance. 2 Risk of Burning or Scalding Some components may be very hot, such as heaters. Also, some components may contain pressurized steam. Use caution when working on these parts. To protect from burns: 1. Allow the CVA to cool down for approximately one hour before starting service or repair work, so that the heaters can cool. 2. In service mode, pump cool water through the heater for a few minutes to shorten the cooling time. Use the component test for each pump. See Table

9 3 Touch Current Measurement Touch current measurement should be carried out on all accessible conductive parts that are not connected to ground. Warning! Touch current measurement may only be performed after the ground connection of the appliance under test has been checked and found to be satisfactory! A defective appliance, as well as accessible conductive parts that are not connected to ground, may carry dangerous voltages! 4 Plumbing Information A plumbed cold-water connection is available only in CVA 4066 models. These models have a factory-installed 90-degree elbow with a ¼ compression fitting (see Figure A- 1). Allow for an extra 2 ½ of depth for this elbow at the back of the coffee system when installing. Figure A-1: Compression Fitting An icemaker kit (not included with the coffee system) with either copper or plastic tubing will work efficiently when installed correctly. The length of this tubing should not exceed 5 feet (1.5 meters). A shutoff valve with customer access should be provided with a plumbed CVA 4066 coffee system. Water pressure for proper operation must be between 14.5 and 145 pounds per square inch. If the water pressure is higher than the maximum allowable pressure, install a water pressure reduction valve. The customer or installer will be responsible for supplying all plumbing material, as well as connectors to the CVA 4066 coffee system. If the water pressure is lower than the minimum pressure, disconnect from the water source and re-program the coffee system as a non-plumbed appliance. See Section for programming instructions. Connection to the water supply should be in accordance with all local, state and national regulations and codes. A licensed plumber may be required in some states; check with the local municipality. 9

10 CVA 4062/CVA 4066/CVA 4068 Coffee Systems 5 Before the First Use The appliance must be correctly installed and connected before first use. Carefully read all instructions on use and care of the CVA in the operating manual. Remove all containers from the CVA and clean them. Refer to the operating manual. Turn on the power switch. Follow the messages in the display. 6 Cleaning in the Dishwasher All removable parts of the coffee system are dishwasher safe, except for the brew unit, beans container, stainless-steel milk container and lid, and main dispenser cover. Regular cleaning in the dishwasher is important so that components do not clog over time. B Modification History When? Who? What? 7/2/2012 Jessica Naples Tech service bulletins added 2/1/2012 Jessica Naples Tech service bulletins added 1/8/2010 Jessica Naples Revision 11/6/2009 Jessica Naples Revision 10/15/2009 Jessica Naples Revision 5/15/2009 Jessica Naples Conversion for Website 3/6/2009 Sabine Hötte Revision 2/13/2009 Sabine Hötte Revision 12/2/2008 Sabine Hötte Revision 9/5/2008 Sabine Hötte Revision 6/6/2008 Sabine Hötte Revision 12/6/2007 Sabine Hötte Initial compilation 10

11 C Technical Data Model CVA 4062 CVA 4066 CVA 4068 Type Free-standing Built-in Tall unit X X X Wall unit Dresser unit X X X Door hinge Left Left Left Dimensions Appliance dimensions Height Width Depth Depth with door open Niche dimensions for built-in appliances Height Width Depth

12 Model CVA 4062 CVA 4066 CVA 4068 Weight Net weight (stainless-steel version) 62.0 lbs 62.0 lbs 62.0 lbs Estimated additional/less weight for: Aluminum version -0.8 lbs -0.8 lbs -- Glass version (Porsche/Poggenpohl lbs design) Hard-plumbing version lbs -- Features Hard-plumbing connection -- X -- Water intake protection (WPM) -- X -- Connection hose length (for hardplumbing connection) Capacity Water tank 0.6 gal 0.6 gal 0.6 gal Beans container 17.6 oz oz oz. Waste container 15 pucks 15 pucks 15 pucks Drip tray capacity 27±3 fl. oz. 27±3 fl. oz. 27±3 fl. oz. Grinder X X X Ground coffee funnel X X X Pumps Stainless-steel flow-thru heaters Height-adjustable coffee dispensing nozzle for cup height Hot-water spout X X X System lock X X X Power consumption in standby mode < 1W < 1W < 1W Can be combined with built-in dish warmer No No No Electrical connection Rated load 1.2kW 1.2kW 1.2kW Fuse rating 10A 10A 10A Voltage 120V 120V 120V Frequency 60Hz 60Hz 60Hz No. of phases No. of neutral conductors Connection cable length Accessories supplied Milk container Milk container handle Large cleaning container Small cleaning container Measuring spoon Bypass cap Hard-plumbing connection hose Allen (hex) key Power cord H05VV-F3G Descaling tablets Cleaning tablets for brew unit Cleaning agent for milk pipework

13 Model CVA 4062 CVA 4066 CVA 4068 Accessories supplied Test strips for measuring water hardness Tube of silicone O-ring Advice sheet - Coffee residue Wiring diagram Allen keys for niche Drink sizes See Section and Table Drink temperatures At flow-thru heater See Section and Table Espresso 187 ± 5 F 187 ± 5 F 187 ± 5 F At dispenser Coffee 187 ± 5 F 187 ± 5 F 187 ± 5 F Table C-1: Technical Data 1 Measure the temperature half an inch (1 centimeter) below the dispenser, not in the cup. 13

14 D Component Layouts 1 Front View CVA 4062/CVA 4066/CVA 4068 Coffee Systems Figure D-1: Front View of Appliance 1 On/Off touchpad 7 Door grip 2 Display 8 Hot-water dispenser 3 Left arrow, <, to scroll through program options 9 Lighting 4 OK touchpad, to confirm selected program options 10 Drip tray and save settings 5 Right arrow, >, to scroll through program options 11 Main dispenser (height-adjustable) 6 Hot Water touchpad 12 Stainless-steel milk container 14

15 2 Interior View Figure D-2: Interior View of Appliance 1 Main switch 7 Water tank 2 Storage drawer 8 Brew unit 3 Ground-coffee chute 9 Waste container 4 Grind adjustment lever 10 Main dispenser connector (connects the brew unit to the main dispenser) 5 Beans container 11 Stainless-steel milk container 6 Drip tray with no-spill grid for transport 15

16 3 Electrical Components 3.1 CVA 4062, CVA 4068 CVA 4062/CVA 4066/CVA 4068 Coffee Systems Figure D-3: CVA 4062, CVA 4068 Component Layout 1 Switch, ground coffee funnel 18 Monitoring switch, grounds container 2 Power electronic (EPL) 19 Flow meter 3 Bean container sensor 20 Steam pump with temperature limiter 4 Grinder with temperature limiter 21 Coffee/hot water pump with temperature limiter 5 Door contact switch 22 Step contact switch, grinding amount 6 Bean container sensor 23 Milk container present/level switch 7 Control/display electronic (EPWZ) 24 Steam solenoid 8 On/Off switch 25 Coffee/hot water NTC 9 Coffee/hot water heater temperature limiter 26 Coffee/hot water heater 10 Dispensing area light 27 Coffee/hot water heater fuse 11 Dispensing monitoring switch 28 Steam heater 12 Dispensing area light 29 Steam heater NTC 13 Brew unit drive with 2 brew unit position switches and 1 brew unit presence switch 30 Steam heater temperature limiter 14 Float switch, water container, minimum level 31 Steam heater fuse 15 Drip tray level switch and drip tray sensor (3 contact springs) 32 Interference suppression filter 16 Ceramic valve with valve step contact switch 33 Not used and valve position switch 17 Hot-water solenoid 34 Main power socket 16

17 3.2 CVA 4066 Figure D-4: CVA 4066 Component Layout 1 Switch, ground coffee funnel 19 Hot-water solenoid 2 Power electronic (EPL) 20 Monitoring switch, grounds container 3 Bean container sensor 21 Flow meter 4 Grinder with temperature limiter 22 Steam pump with temperature limiter 5 Door contact switch 23 Coffee/hot water pump with temperature limiter 6 Bean container sensor 24 Step contact switch, grind amount 7 Control/display electronic (EPWZ) 25 Milk container present/level switch 8 On/Off switch 26 Rinsing solenoid 9 Coffee/hot water heater temperature limiter 27 Coffee/hot water NTC 10 Dispensing area light 28 Coffee/hot water heater 11 Dispensing monitoring switch 29 Coffee/hot water heater fuse 12 Dispensing area light 30 Steam heater 13 Float switch, water container, maximum level 31 Steam heater NTC 14 Brew unit drive with 2 brew unit position switches and 1 brew unit presence switch 32 Steam heater temperature limiter 15 Float switch, water container, minimum level 33 Steam heater fuse 16 Water supply valves 34 Interference suppression filter 17 Drip tray level switch and drip tray sensor (3 contact springs) 35 Not used 18 Ceramic valve with valve step contact switch 36 Main power socket and valve position switch 17

18 010 Housing 18

19 4 Service 4.1 Removing the Appliance from a Cabinet 1. Turn off the water supply (CVA 4066). 2. Disconnect the appliance from power. 3. Open the door. 4. Remove the containers and drip tray. 5. Remove the four retaining screws (Figure 010-1, Item 1). Figure 010-1: Removing the Appliance from a Cabinet 6. Slide the appliance out of its cabinet. 7. Disconnect the appliance from the water supply (CVA 4066). 8. Disconnect the power connections. < 19

20 4.2 Installation Note: Make sure that the cabinet or the walls are stable enough to support the appliance. The CVA is designed to be built into cabinets and must be fully installed before any operation is preformed. This appliance can be installed above another appliance but there must be a solid, closed shelf between the base of the coffee machine and the top of the appliance installed below. Exercise caution while operating the appliance. Coffee, hot water and steam can cause burns and damage to surrounding areas. Allow an additional depth of 2 ½ for CVA 4066 installations (see Figure 010-2). Figure 010-2: CVA 4066 Plumbing Installation Procedure Note: Make sure power is not supplied to the appliance while installation or maintenance work is being preformed. Disconnect the power supply to the work area by unplugging the appliance and tripping the circuit breaker. The coffee system must be installed into cabinetry before being used. 1. For installation, provide the proper clearances and shelving support. Also allow an additional depth of 2.5 for CVA 4066 models. 2. Connect to a plumbed cold-water supply (CVA 4066 systems). Before installing the CVA system into the cabinet, check/test the water connections for leaks. 20

21 3. The on-site water line must have a water valve to turn water off when needed. If not present, have a water valve installed by a licensed plumber. 4. If necessary, unscrew the height-adjustable feet (Figure 010-3) on the underside of the machine by about 1 16 " (2 millimeters). These feet can be turned by up to ⅜ (10 millimeters), if necessary. Figure 010-3: CVA Feet Adjustment 4. Plug the power cord into the electrical outlet. 5. Connect the appliance to the water supply, test for leaks. 6. Push the appliance all the way back into the cabinet and center it. If the cabinet has ¾" (19mm) side walls, mark the four holes for mounting. (See Figure 010-4, Items 1 and 2, for location.) 7. Take the appliance out of the cabinet and carefully drill four holes at the screw marks ( 1 16 " [2mm], diameter 3 16 " [4.5mm]). 8. Push the appliance back into the cabinet until fully seated. 9. Open the front of the appliance and turn the 4 screws, tightening them against the inside of the cabinet. The screws should be tightened equally to ensure that the appliance is centered to the cabinet. See Figure Figure 010-4: CVA Mounting Locations 10. Fill the bean and water containers. 11. Program user settings appropriate for the CVA model. 12. Perform an operational check. Check for leaks. 13. Provide the customer with an operational overview. 21

22 4.2.2 Adjusting the Door Hinges The door hinges can be adjusted if the door cannot be opened easily. To adjust the door sideways, turn the screw as shown in Figure 010-5, Item 1. To adjust the door forwards or backwards, turn the screw as shown in Figure 010-5, Item 2. Figure 010-5: Door Hinge Adjustment 22

23 011 Exterior Side Panels 23

24 020 Door Inner Panel 24

25 021 Coffee/Hot-Water Dispenser 25

26 2 Function 2.1 Adjusting the Dispenser Height To prevent the coffee or espresso from cooling prematurely, and to achieve a better crema, the coffee dispenser can be adjusted to minimize the distance to the cup. 1. Slowly move the coffee dispenser up or down. See Figure Figure 021-1: Dispenser Height Adjustment 3 Fault Repair 3.1 Coffee or Espresso Too Cold Machine settings. Suggested Remedies: Note: Measure the temperature half an inch (1 centimeter) below the dispenser, not in the cup. The temperature should be 187 F (± 3 F). 1. Pre-warm cups. 2. Set the temperature for coffee and espresso to maximum; see Section and Table Set the grinding setting at least one level lower (finer). 4. Increase the grind (ground coffee) amount; see Section and Table Activate pre-brewing; see Section and Table Note: Additional increase in brewing temperature will burn the coffee and ruin its taste. 3.2 Milk Froth Unsatisfactory or Sputtering Symptom: Milk froth is unsatisfactory. The hot dispensed milk sputters and spits. Defective dispenser. 26

27 Since machine no , an improved dispenser (mat. no ) has been installed. Replace the defective dispenser with this new dispenser, if necessary. The rubber stoppers have become loose and gotten stuck in the machine when the dispenser is removed. Remove the stuck rubber stoppers from the machine. Re-insert them in the nozzles. Insert the dispenser back in the machine. Rubber stoppers in the dispenser nozzles were not removed when the dispenser was cleaned. Remove both rubber stoppers from the dispenser nozzles. Clean the stoppers and the nozzles; see the operating manual. Advise the customer about the cleaning instructions in the operating manual. Milk container inserted incorrectly. If the milk container is crooked or not inserted deeply enough, air can be drawn into the milk hose. This will lead to unsatisfactory milk froth. Insert the milk container correctly. Drip tray grid incorrectly inserted. Insert the drip tray grid correctly. 27

28 CVA 4062/CVA 4066/CVA 4068 Coffee Systems 025 Door Outer Panel, Control/Display Electronic 28

29 2 Function 2.1 Optical Interface (MDU) The appliance has an optical interface for diagnostic support or program updating; see Figure 025-1, Item 1. Its location can be found by using the optical interface search function of the Miele Diagnostic Support unit (MDU). Figure 025-1: Optical Interface for Diagnostic Support and Program Updating 2.2 Control/Display Electronic EPWZ (N5) The control/display electronic is located in the door (Figure D-3 or D-4, Item 8). It is connected to the power electronic EPL (N4) via a communication cable and controls the messages in the display. 2.3 Touch Controls Select a program using the < and > touchpads. See Figure D-1, Items 3 and 5. Confirm selections with the OK touchpad (Figure D-1, Item 4). Use Back to go back to the previous screen. 3 Fault Repair 3.1 Diagnostic Support Cannot Establish a Connection Symptom: The connection cannot be made via the optical interface. Diagnostic support cannot be used with a machine logged onto RemoteVision. 3 remedies are possible: 1. Access the service mode, or 2. Briefly disconnect the machine from the power supply, or 3. Log off the machine from the RemoteVision system. Subsequently, diagnostic support can be connected to the machine via the optical interface. RemoteVision cannot be used while this connection is in place. 29

30 To deactivate the optical interface again, depending on the selected remedy: 1. Quit the machine service mode, or 2. Briefly disconnect the machine from the power supply again, or 3. Log on the machine to the RemoteVision system. After a maximum of 1 minute, the RemoteVision system can be used again. 3.2 RemoteVision InfoControl: Incorrect Language Set See DTD for XIC RemoteVision InfoControl: Time of Day Setting Varies See DTD for XIC RemoteVision InfoControl: Buzzer Inoperative See DTD for XIC RemoteVision InfoControl: Data Transfer Interference See DTD for XIC RemoteVision InfoControl: Mobile Receiver Display Faulty See DTD for XIC Machine Runs Automatically and Chirps When the Door is Opened Faulty grounding of the fascia panel. The ground spring in the upper door hinge does not have contact with the stainless-steel panel. Note: The fascia panel is coated with Cleansteel and is thus nonconductive, so measure resistance on the edge of the panel. 1. Use an ohmmeter to measure the resistance between the housing edges and ground. 2. Release the top hinge on the door. 3. Move the spring back and forth. The spring should press against the stainless-steel fascia. 4. Secure the hinge. 5. Check the resistance again. 4 Service 4.1 Control/Display Electronic EPWZ (N5) Removal 1. Disconnect the appliance from power. 2. Turn off the water supply (CVA 4066). 3. Open the door. 4. Remove the milk container. 5. Remove the three right cover retaining screws (T10); see Figure 025-2, Item 1. 30

31 6. Remove the right cover. 7. Remove the five central cover retaining screws (T10); see Figure 025-2, Item Remove the central cover. Figure 025-2: Right and Central Covers 9. Disconnect the three milk and coffee hoses; see Figure 025-3, Item B. 10. Disconnect the milk container sensor connection from the control/display electronic (blue wire); see Figure 025-3, Item A. 11. Remove the stainless-steel cover from the front of the main dispenser. Figure 025-3: Hose and Wire Connections 12. Release the plastic elbow with water line from its guide in the upper right-hand corner of the control/display electronic's cover (near Item 2 in Figure 025-4). 13. Release all hoses and wires from their guides in the control/display electronic's cover. Mark the location of each hose. 14. Remove the four main dispenser retaining screws (T10). See Figure 025-4, Item 1. 31

32 15. Remove the main dispenser. CVA 4062/CVA 4066/CVA 4068 Coffee Systems Figure 025-4: Main Dispenser Retaining Screws 16. Remove the three control/display electronic cover retaining screws (Figure 025-5, Item 1). 17. Disconnect the power electronic connection (Figure 025-5, Item 2). 18. Remove the control/display electronic cover. Figure 025-5: Control/Display Electronic Cover and Power Electronic Connection 19. Disconnect all electrical connections from the control/display electronic; see Figure 025-6, Items 1, 2 and Carefully remove the housing containing the control/display electronic. 21. Unsnap at the bottom first, then at the top. 32

33 Figure 025-6: Control/Display Electronic Connections 1 Control panel (A1) connection 2, 3 Power electronic (2N1) connections 4.2 Dispenser Present Switch (S87/6) Removal 1. Remove the side cover. 2. Remove the central cover. 3. Squeeze the tabs of the microswitch housing inwards. 4. Pull the housing up and out; remove the microswitch from the housing. 4.3 Dispensing Area Light (1H3, 2H3) Removal Note: Refer to Figure D-2 or D-3, Items 10 and 12, for component location. 1. Remove the side cover. 2. Remove the central cover. 3. Unsnap the appropriate lighting unit from its holder. 4. Disconnect the wiring harness. 4.4 Door Removal 1. Disconnect the appliance from power. 2. Turn off the water supply (CVA 4066). 3. Open the door. 4. Remove the control/display electronic. See Section Remove the screws that hold the door hinge to the front door cover (see Figure 025-7, Item 1) and remove the door from the appliance. 33

34 Figure 025-7: Door Hinge Screws Note: The Teflon hoses are different colors to prevent crossing the lines during reassembly. Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 34

35 030 Drive, Brew Unit 35

36 2 Function 2.1 Brew Unit Control Coffee is dispensed into the hopper of the brew unit by the grinder operation. The brew unit drive motor is energized and the brew unit drives toward the brew position; the ground coffee is compressed between the filters. Once the brew unit position switch is actuated, power to the brew unit drive motor is interrupted. Hot water is pumped into the brew unit, which passes through the filters, mixes with the grounds, and then exits the brew unit as coffee. The brew unit drive motor is now energized in the reverse position. This drives the brew unit back toward the home position. The compressed used grounds are dumped as pucks into the waste container. Once the brew unit home switch is actuated, power to the brew unit drive motor is interrupted Microswitch Locations The brew unit is controlled by 4 microswitches (Figure 030-1). The drive system and actuator disk are in the neutral position when the left-hand actuator of the double cam is activating the upper microswitch (Figure 030-1, Item 3). This is the initial default position of the brew unit. When the brew unit is correctly installed, the brew unit present microswitch (Figure 030-1, Item 2) is activated. After the brew unit has been activated, if one of the two positioning microswitches (Figure 030-1, Item 3 or 4) has not switched within approximately 10 seconds, fault F73 will be indicated (see Section ). 1 Grind amount compensation microswitch (S51/4) 2 Brew unit present monitoring microswitch (S87/2) 3 Top position control (home setting) microswitch (S60/1) 4 Bottom position control (compressing and drain position) Figure 030-1: Brew Unit Microswitches Electronic Grind Amount Compensation The grind amount compensation balances out variations in grinder settings and coffee types. The grind amount can be set in the customer programming mode for the various coffee types (coffee, espresso, cappuccino). The setting range is divided into levels 1 36

37 to 7, which cover grinding times of 5.5 to 9.5 seconds (± 1.6 seconds ground quantity compensation). To prevent the brewing mechanism from overfilling, the maximum grinding time is limited to 10 seconds. During the brewing process, the switching cam on the brew unit (Figure 030-2, Item 1) passes over the microswitch actuator (Figure 030-2, Item 2). Figure 030-2: Brew Unit Switching Cam, Ground Quantity Compensation Microswitch The further the switch cam advances, the greater the ground quantity in the brew unit. Five different settings can be registered: Position Microswitch Position Switching Process 1 In front of the first cam Off 2 On the first cam Off, On 3 Between the two cams Off, On, Off 4 On the second cam Off, On, Off, On 5 Behind the second cam Off, On, Off, On, Off Table 030-1: Switch Cam Settings Three volume areas can be measured for the ground quantity; see Figure They represent the selectable volume areas on the machine; see Figure Figure 030-3: Measurable Volume Areas 1, 2 and 3 37

38 Figure 030-4: Selectable Volume Areas 1, 2 and 3 If the measure quantity varies from the set quantity, then the grinding time will be increased or decreased by approximately 0.2 seconds as appropriate during the next grinding cycle. Because the maximum ground quantity compensation is ±1.6 seconds, this adjustment can be repeated up to 8 times Brew Unit Drive, Home Position If the brew unit is in the home position, the left cam of the double-cam element activates the top microswitch; the bottom microswitch is not switched (Figure 030-5). The pawl is in the home position (Figure 030-6). Figure 030-5: Home Position, Rear View Figure 030-6: Home Position, Front View 38

39 2.1.4 Brew Unit Drive, Compressing Position (Brew Position) The drive moves until the second cam of the double-cam element switches the bottom microswitch, and the top microswitch is no longer switched (Figure 030-7). The pawl presses down on the spring (Figure 030-8) and closes the drain valve. The ground coffee is slightly compressed and brewed. Figure 030-7: Compressing Position, Rear View Figure 030-8: Compressing Position, Front View Brew Unit Drive, Drain Position After the coffee is brewed, the drive moves back until the first cam of the double-cam element activates the bottom microswitch and the top microswitch is switched (Figures and ). The tension of the spring is released, the drain valve is opened, and the residual water runs into the drip tray before the coffee puck is dropped. 39

40 Figure 030-9: Drain Position, Rear View Figure : Drain Position, Front View 3 Fault Repair 3.1 Coffee Grounds Next to the Brew Unit Symptom: After approximately 5 coffee servings, there is a large amount of coffee grounds next to the brew unit. The grind amount compensation is set to maximum. See the function description for grind amount compensation, Section

41 Note: Since machine no , a new brew unit (mat. no ) has been incorporated. 1. Replace the brew unit. 2. So that the grinding amount compensation can be re-adjusted, restore all settings to their factory defaults; see Section and Table Service 4.1 Brew Unit Drive (M26) Removal 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure , Item 1. Figure : Service Door Screws 5. Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure

42 1 Grind amount compensation microswitch 2 Brew unit drive Figure : Service Door Open 7. Disconnect the brew unit drive electrical connection (red and black wires). 8. Disconnect plug ST4 from the power electronic. 9. Open the appliance door. 10. Remove all containers from the appliance. 11. Release the brew unit. Push in on the handle and slide it to the left. Remove the brew unit from the machine. See Figure Figure : Brew Unit Removal 12. Remove the five T10 screws securing the brew unit drive; see Figure , Item 1. 42

43 13. Remove the white cam. 14. Remove the brew unit drive. Figure : Brew Unit Drive Retaining Screws Note: When re-installing the brew unit drive, ensure that the white cam is in the home position. See Brew Unit Drive, Home Position, Section Removing the Grind Amount Compensation Microswitch (S51/4) 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure , Item Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure Disconnect the microswitch electrical connection; see Figure , Item 1, for location. 8. Release the microswitch from its retaining tabs to remove. 4.3 Removing the Brew Unit Position Microswitches (S60/1, S60/2) 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure , Item Release the wiring harness (black cable) connecting the control and power electronics from its guide. 43

44 6. Open the service door. See Figure Unsnap the cover containing the microswitches and the double-cam element. 8. Disconnect the appropriate microswitch's wiring harness. 9. Release the microswitch from its retaining tabs to remove. 44

45 040 Grinder 45

46 2 Function 2.1 Adjusting the Grinder Setting Push the slide control to the left for a finer grind or to the right for a coarser grind. See Figure You should be able to feel the adjustment settings when moving the slide control. If the slide control will not move, close the machine and dispense a cup of coffee, then try to move the slide control again Figure 040-1: Grinder Adjustment 2.2 Filling Ground Coffee A funnel for ground coffee is provided in case the customer would like to prepare a different coffee type, such as decaffeinated coffee. 1. Pull the container for the ground coffee out of the appliance and lift the funnel lid (Figure 040-2, Item 1). 2. Place one spoonful of ground coffee into the funnel (Figure 040-2, Item 2), using the supplied spoon, and close the lid. 3. Push the container into the appliance and close the door. Figure 040-2: Ground Coffee Funnel and Lid For more information, see "Preparing drinks - Coffee and espresso prepared from ground coffee" in the operating manual. 4 Service 4.1 Grinder (M25) Removal 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure 040-3, Item 1. 46

47 Figure 040-3: Service Door Screws 5. Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure Figure 040-4: Service Door Open 7. Open the appliance door. 8. Remove the bean container. 9. Remove the five T10 screws securing the bean container guide; see Figure 040-5, Item 1. 47

48 Figure 040-5: Bean Container Guide Retaining Screws 10. Pull off the adjustment lever handle; see Figure Figure 040-6: Adjustment Lever Handle 11. Remove the bean container guide and disconnect the wiring harness. 12. Slide the adjustment lever all the way to the right; see Figure Remove the three grinder retaining screws (T10); see Figure 040-7, Item 1. Remove the three rubber bushings and brass rods underneath the screws. 48

49 14. Remove the T10 screw securing the ground coffee chute to the grinder (Figure 040-7, Item A) and remove the chute. Figure 040-7: Grinder Retaining Screws 15. Remove the grinder halfway. 16. Disconnect all electrical connections to the grinder. 17. Carefully remove the grinder from the appliance. Note: When re-installing the grinder, first install the rubber bushings in their notches on the grinder, then slide the brass rods into place. 49

50 050 Flow-Thru Heaters 50

51 2 Function 2.1 Steam System The appliance has two heating systems. This allows for independent preparation of froth/cappuccino or espresso/coffee. The second heating system can be turned off to save energy during the heating phase, e.g., if froth is not prepared very often. When the steam system is turned off and froth or cappuccino is selected, the appliance must heat up first to produce steam. The steam system is turned on by default. 4 Service 4.1 Removing the Coffee/Hot Water Heater (2R1) 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure 050-1, Item 1. Figure 050-1: Service Door Screws 5. Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure

52 1 Steam heater 2 Coffee/hot water heater Figure 050-2: Service Door Open, Showing Heaters 7. Remove the 2 bottom rear panel retaining screws (T10). 8. Remove the bottom rear panel. 9. Remove the two spring clips from the coffee/hot-water heater water line connections (arrows, Figure 050-3). 10. Remove the four heater bracket retaining screws (T10); see Figure 050-3, Item Remove the heater/bracket assembly. Figure 050-3: Coffee/Hot Water Heater 12. Unscrew the temperature sensor, temperature limiter and fuse from the heater; see Figure 050-4, Items 1, 2 and Disconnect the heater electrical connection (yellow/green wire; sometimes secured with a screw). 52

53 1 Temperature limiter 2 Fuse 3 Temperature sensor Figure 050-4: Temperature-Regulating Components on Coffee/Hot Water Heater Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 4.2 Removing the Temperature Limiter, Fuse, Temperature Sensor from the Coffee/Hot-Water Heater 1. Remove the coffee/hot water heater; see Section Temperature limiter 2 Fuse 3 Temperature sensor Figure 050-5: Temperature-Regulating Components on Coffee/Hot Water Heater 2. To remove the temperature limiter, unscrew its mounting bracket from the heater. Disconnect the electrical connections and unsnap the temperature limiter from the mounting bracket. 3. To remove the fuse, unscrew its mounting bracket from the heater. Disconnect the electrical connections. Remove the T20 screw securing the mounting bracket and separate the bracket from the fuse. 4. To remove the temperature sensor, unscrew it from the heater and disconnect its wiring harness. 53

54 4.3 Removing the Steam Heater (1R1) 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure 050-6, Item 1. Figure 050-6: Service Door Screws 5. Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure Steam heater 2 Coffee/hot-water heater Figure 050-7: Service Door Open, Showing Heaters 7. Remove the two spring clips from the heater water connections (arrows, Figure 050-8). 54

55 8. Remove the four heater bracket retaining screws (T10); see Figure 050-8, Item Remove the heater/bracket assembly. Figure 050-8: Steam Heater and Bracket 10. Unscrew the temperature sensor, temperature limiter and fuse from the heater; see Figure 050-9, Items 1, 2 and Disconnect the heater electrical connection (yellow/green wire; sometimes secured with a screw). 1 Temperature limiter 2 Temperature sensor 3 Fuse Figure 050-9: Temperature-Regulating Components on Steam Heater Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 55

56 4.4 Removing the Temperature Limiter, Temperature Sensor, Fuse from the Steam Heater 1. Remove the steam heater; see Section Temperature limiter 2 Temperature sensor 3 Fuse Figure : Temperature-Regulating Components on Steam Heater 2. To remove the temperature limiter, unscrew its mounting bracket from the heater. Disconnect the electrical connections and unsnap the temperature limiter from the mounting bracket. 3. To remove the temperature sensor, unscrew it from the heater and disconnect its wiring harness. 4. To remove the fuse, unscrew its mounting bracket from the heater. Disconnect the electrical connections. Remove the T20 screw securing the mounting bracket and separate the bracket from the fuse. 56

57 051 Pumps, Solenoids, Flow Meters 57

58 2 Function 2.1 Water Paths Overview Figure 051-1: CVA Water Path - Overview 1 Steam heater 10 Coffee/hot-water heater 2 Steam pump 11 Ceramic valve 3 Water tank 12 Pressure relief valve 4 Flow meter 13 Drain valve 5 Coffee/hot-water pump 14 Decompression vessel 6 Milk container 15 Brew unit 7 Hot-milk dispenser 16 Milk froth dispenser 8 Rinsing solenoid 17 Drip tray 9 Hot-water solenoid 18 Large cleaning container 58

59 2.1.2 Water Path Coffee The highlighted path in Figure details the flow of water in the coffee- and espresso-making process. Water flows from the water tank (3), through the flow meter (4), and into the coffee/hot-water pump (5), where it is pumped out through the coffee/hot-water heater (10). From there it flows through the pressure relief valve (12), then the brew unit filled with coffee (15) and finally through the dispenser into the cup(s). The coffee puck drops into the waste container, and the residual water runs via the drain valve (13) into the drip tray (17). Figure 051-2: Coffee Water Path 3 Water tank 12 Pressure relief valve 4 Flow meter 13 Drain valve 5 Coffee/hot-water pump 15 Brew unit 10 Coffee/hot-water heater 17 Drip tray Water Path Hot Water The highlighted path in Figure details the flow of water for hot-water production. When hot water is selected, water is drawn from the water tank (3), through the flow meter (4), and into the coffee/hot-water pump (5), where it is pumped out through the coffee/hot-water heater (10). The hot-water solenoid (9) opens the hot-water path, and the hot water runs through the hot-water dispenser into the cup. 59

60 Figure 051-3: Hot-Water Path 3 Water tank 9 Hot-water solenoid 4 Flow meter 10 Coffee/hot-water heater 5 Coffee/hot-water pump 17 Drip tray Water Path Hot Milk The highlighted path in Figure details the flow of steam and milk in the hot-milk process. When hot milk is selected, the steam pump (2) draws water from the water tank (3). The water is then pumped through the steam heater (1). The steam is now sent through the ceramic valve (11), after which it mixes with milk from the milk container (6). The hot milk is dispensed via the hot-milk dispenser (7) into the cup. Any remaining vapor is drained out through the decompression vessel (14). Figure 051-4: Hot-Milk Path 1 Steam heater 7 Hot-milk dispenser 2 Steam pump 11 Ceramic valve 3 Water tank 14 Decompression vessel 6 Milk container 60

61 2.1.5 Water Path Milk Froth The highlighted path in Figure details the flow of steam and milk for milk froth production for cappuccino or latte macchiato (or solely milk froth). When one of these beverages is selected, the steam pump (2) will draw water from the water tank (3). The water is then pumped through the steam heater (1). The steam is now sent through the ceramic valve (11), after which it mixes with milk from the milk container (6). The milk froth is dispensed via the milk froth dispenser (16) into the cup. Any remaining vapor is drained out through the decompression vessel (14). Figure 051-5: Milk Froth Path 1 Steam heater 11 Ceramic valve 2 Steam pump 14 Decompression vessel 3 Water tank 16 Milk froth dispenser 6 Milk container 61

62 4 Service 4.1 Hot-Water Solenoid (Y61) Removal 1. Remove the appliance from its cabinet. See Section Remove the two screws securing the support plate (one T10 and one T20); see Figure 051-6, Item Open the support plate. Figure 051-6: Support Plate Retaining Screws 62

63 1 Rinsing solenoid 2 Hot-water solenoid Figure 051-7: Rinsing and Hot-Water Solenoids 4. Remove the two spring clips from the hot-water solenoid water connections; see arrows, Figure Remove the solenoid. 6. Disconnect all solenoid electrical connections. Figure 051-8: Hot-Water Solenoid Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 63

64 4.2 Rinsing Solenoid (Y62) Removal 1. Remove the appliance from its cabinet. See Section Remove the two screws securing the support plate (one T10 and one T20); see Figure 051-9, Item Open the support plate. Figure 051-9: Support Plate Retaining Screws 64

65 1 Rinsing solenoid 2 Hot-water solenoid Figure : Rinsing and Hot-Water Solenoids 4. Remove the three spring clips from the rinsing solenoid water connections; see Figure Remove the solenoid. 6. Disconnect all solenoid electrical connections. Figure : Rinsing Solenoid Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 65

66 4.3 Coffee/Hot Water Pump (2M7) Removal 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure , Item 1. Figure : Service Door Screws 5. Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure Figure : Service Door Open 7. Remove the two bottom rear panel retaining screws. 8. Remove the bottom rear panel. 66

67 9. The coffee/hot-water pump is shown in Figure , Item 1. 1 Coffee/hot-water pump 2 Steam pump Figure : Coffee/Hot Water and Steam Pumps 10. Remove the spring clip from the Teflon hose connection on the pressure relief valve and disconnect the Teflon hose; see Figure , Item Disconnect the two pump electrical connections. 12. Remove the four pump retaining screws (T10); see Figure , Item Remove the pump. 14. Pull the silicone hose off of the pump; see arrow, Figure Release the temperature limiter retainer using needlenose pliers and remove the temperature limiter. See Figure , Item Unscrew the pressure relief valve; see Figure , Item Pull off the pump rubber brackets (top and bottom). 67

68 1 Pressure relief valve 2 Pump retaining screws 3 Temperature limiter Figure : Coffee/Hot Water Pump Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 4.4 Steam Pump (1M7) Removal 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure , Item Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure Remove the two bottom rear panel retaining screws. 8. Remove the bottom rear panel. 9. The steam pump is shown in Figure , Item Disconnect the pump electrical connections. 11. Remove the four pump retaining screws (T10); see Figure , Item Remove the pump. 13. Release the spring clip securing the Teflon hose and pull the hose free; see Figure Pull the silicone hose off of the pump; see Figure Release the spring clip securing the temperature limiter (needlenose pliers) and remove the temperature limiter. See Figure , Item Pull off the pump rubber brackets (top and bottom). 68

69 1 Pump retaining screws 2 Temperature limiter Figure : Steam Pump Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 4.5 Flow Meter (B3/4) Removal 1. Remove the appliance from its cabinet. See Section Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 3. Remove the top cover. 4. Remove the three service door retaining screws; see Figure , Item Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. See Figure Remove the two bottom rear panel retaining screws. 8. Remove the bottom rear panel. The flow meter is shown in Figure , Item 1. 69

70 Figure : Flow Meter 9. Disconnect the silicone hoses from the flow meter; see Figure Disconnect the flow meter wiring harness. 11. Remove the flow meter from its plastic support. See Figure , Item 2. Figure : Flow Meter (1) and Plastic Support (2) Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 70

71 4.6 Decompression Vessel Removal 1. Remove the appliance from its cabinet. See Section Open the front door of the appliance and take out the waste container. 3. Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 4. Remove the top cover. 5. Remove the three service door retaining screws; see Figure , Item Release the wiring harness (black cable) connecting the control and power electronics from its guide. 7. Open the service door. See Figure If necessary, remove the bottom rear panel retaining screws and bottom rear panel. 9. Pull off the drain tube from the decompression vessel. See Figure , Item Remove the 2 T10 screws securing the decompression vessel. See Figure , Item 2. Remove the vessel. Figure : Decompression Vessel and Ceramic Valve 4.7 Ceramic Valve Removal 1. Remove the appliance from its cabinet. See Section Open the front door of the appliance and take out the waste container. 3. Carefully remove the top cover retaining screws. The larger (T20) screws have metal washers underneath that can easily be misplaced. 4. Remove the top cover. 5. Remove the three service door retaining screws; see Figure , Item Release the wiring harness (black cable) connecting the control and power electronics from its guide. 71

72 7. Open the service door. See Figure If necessary, remove the bottom rear panel retaining screws and bottom rear panel. 9. Pull off the drain tube from the decompression vessel. See Figure , Item 1. The ceramic valve is located at Figure , Item Remove the 2 spring clips from the 2 water lines at the front of the ceramic valve. See Figure , Item 1. Disconnect the water lines. Figure : Ceramic Valve, Removed from Machine 11. Remove the 2 T10 screws securing the ceramic valve to the side panel (screws are located next to the solenoid mounting bracket). 12. Free the ceramic valve, then remove the 2 spring clips securing the water line at the rear of the valve (brown elbow). See Figure , Item 2. 72

73 060 Containers, Drip Tray, Accessories 73

74 2 Function 2.1 Water Tank The CVA 4066 coffee system has a different water tank than the CVA There are two magnetic floats in the water tank to monitor water levels (versus only one float in the CVA 4062's water tank). An anti-splash tube is attached to the lid of the water tank to prevent splashing of water while filling. 2.2 Filling the Water Tank Bean and water quality are important for a good espresso or coffee. Therefore, the water tank in a CVA 406x coffee system should be washed and filled with fresh cold drinking water before each day of use (a reminder will be displayed when the machine is turned on). In CVA 4066 systems, the water can be filled automatically with fresh cold water. See Section Note: Never add hot water or any other liquids except cold water to the water tank. Do not use deionized or mineral water. Mineral water leads to heavy calcium buildup in the machine that can cause damage Manually Filling the Water Tank 1. Open the appliance door by holding the grip next to the hot water spout and pulling the door towards you. See Figure Figure 060-1: Pull Door Open 2. Pull the water tank out. See Figure Figure 060-2: Pull Water Tank Out 3. Fill the container with fresh, cold tap water to the "Max" mark. The valve on the water tank ensures that water cannot leak out. 4. Close the lid and push the water tank into the machine until it clicks into place. 74

75 Note: The water tank must be positioned correctly or the valve will leak. If the water tank has not clicked into place, pull the tank out, then check and clean the niche Automatically Filling the Water Tank (CVA 4066 Models Only) 1. Select Settings from the main menu. Figure 060-3: Setting Water Fill to Automatic, Step 1 2. Touch < or > to scroll to Plumbed water supply. Touch OK to select. Figure 060-4: Setting Water Fill to Automatic, Step 2 3. Select On for a plumbed CVA (4066) system, then confirm with OK. Note: When Plumbed is set to Off, the water tank must be filled manually with fresh tap water. Refer to Section for filling instructions. When Plumbed is set to On, the water tank is automatically filled. 2.3 Filling the Beans Container The beans container is to be filled with fresh coffee or espresso beans. No flavored coffee beans or caramelized, pre-treated or ground coffee should be placed in this container as doing so will damage the grinder. Refer to the operating manual for types of coffee that are permitted. 1. Pull the bean container out. Figure 060-5: Beans Container 2. Push the lid back and fill the container with coffee beans. 3. Push the lid back into place and push the beans container back into the appliance. 4. Close the door. 75

76 3 Fault Repair 3.1 Milk Container Not Registered as Empty Moisture in the handle. This moisture causes a short circuit to the housing, and thus prevents sensing. Rinse off the handle, shake it out and let it dry. 3.2 Milk Container Present But Not Registering Electromagnetic interference (EMI). Contact the factory. 4 Service 4.1 Rinsing the Milk Pipework Note: To prevent milk from going sour in the coffee system and/or clogging the pipework, the pipework should be rinsed through after each use. Rinsing is not a substitute for cleaning the pipework at the end of each day! 1. Switch the appliance on. 2. From the customer settings menu, select Maintenance and then OK. 3. Select Rinse the milk pipework and touch OK. 4. Select Start and touch OK. 5. When prompted, fill the large plastic container with cold water to the max mark and then press OK. 6. When prompted again, fit the lid from the stainless-steel milk container on the large plastic container, then turn it counterclockwise until it engages with the container. Insert it in the coffee system where the stainless-steel milk container normally sits. Close the appliance door and touch OK. 7. Follow the directions in the display. 8. When the customer settings menu reappears in the display, the pipework has been rinsed. The appliance may now be switched off. 4.2 Cleaning the Milk Pipework Note: To prevent milk from going sour in the coffee system and/or clogging the pipework, the pipework should be cleaned at the end of each day. If the milk pipework in the milk container lid is clogged, clean it under running water, using the supplied cleaning brush, until all milk deposits are removed. 76

77 1. Switch the appliance on. 2. From the customer settings menu, select Maintenance and then touch OK. 3. Select Clean milk pipework and touch OK. 4. Select Start and touch OK. 5. When prompted to dissolve the cleaning agent in the large plastic container, fill this container with lukewarm water to the max mark, add the cleaning agent, and press OK. Lukewarm water must be used to dissolve the cleaning agent properly. It is important to use the supplied Miele cleaning agent as it has been developed specifically for this machine. 6. When prompted again, fit the lid from the stainless-steel milk container on the large plastic container, then turn it counterclockwise until it engages with the container. Insert it in the coffee system where the stainless-steel milk container normally sits. Close the appliance door and touch OK. 7. Follow the directions in the display. 8. When Prog. finished appears in the display, the pipework has been cleaned. The appliance may now be switched off. 4.3 Cleaning the Stainless-Steel Milk Container Note: It is important to keep the neck and seals of this container clean. Any soiling can lead to malfunction of the milk container. 1. Clean the stainless-steel milk container and lid by hand with soap and hot water. 2. Rinse the handle under running water and then clean it thoroughly with a damp cloth to remove all milk residue. 3. If the milk pipework in the milk container lid is clogged, clean it under running water, using the supplied cleaning brush, until all milk deposits are removed. Note: Do not fill the container to the neck. Leave a gap of about to Descaling the Appliance The CVA coffee system must be descaled regularly. The CVA will display a reminder message to descale and will lock the appliance if not descaled. Descale tablets are large tablets that were supplied with the machine, and are specially developed for the CVA coffee system to optimize the descaling process. Descale tablets can be purchase online or calling Miele directly. Refer to the operating manual for descaling instructions. Note: CVA 4066 models: Set Plumbed water supply to Off before descaling (touch OK to save the setting). After the appliance has been descaled, reset Plumbed water supply to On and save (by touching OK). Refer to Section for setting instructions. 77

78 070 Electronic Modules 78

79 2 Function 2.1 Machine Response after Power Supply Interruption After a power failure, the machine remains switched off (standby). The fault memory and all modifications made by the operator are saved. 2.2 Software IDs Production Index ID No. Software Version 00 Pre-production models 10 Software release 1 (corresponds to machine no. 10/ (12/2/2008) EPL: 1815 (V1) EPX: 1814 (V7) CVA 4062: CVA 4066: Software release 2 70 (corresponds to machine no. 70/ (5/28/2009)) Table 070-1: Software IDs EPL: 1913 (V1) EPX: 1912 (V1) CVA 4062: CVA 4066: Fault Repair 3.1 F1 -- Coffee/Hot Water NTC (2R30) Short-Circuited Coffee/hot water NTC (2R30) short-circuited. 1. Check the connection leads. 2. Replace the connection leads, if necessary. 3. Check the temperature sensor via service mode. Note: The approximate resistance values of this NTC are 100kΩ at 77 F (25 C), 5.5kΩ at 212 F (100 C), and 1kΩ at 320 F (160 C). 4. Check the resistance of the temperature sensor at different temperatures and compare to the above values. 5. Replace the temperature sensor, if necessary. 3.2 F2 -- Coffee/Hot Water NTC (2R30) Open-Circuited Coffee/hot water NTC (2R30) open-circuited. 1. Check the connection leads. 2. Replace the connection leads, if necessary. 3. Check the temperature sensor via service mode. 79

80 Note: The approximate resistance values of this NTC are 100kΩ at 77 F (25 C), 5.5kΩ at 212 F (100 C), and 1kΩ at 320 F (160 C). CVA 4062/CVA 4066/CVA 4068 Coffee Systems 4. Check the resistance of the temperature sensor at different temperatures and compare to the above values. 5. Replace the temperature sensor, if necessary. 3.3 F3 -- Steam NTC (1R30) Short-Circuited Steam NTC (1R30) short-circuited. 1. Check the connection leads. 2. Replace the connection leads, if necessary. 3. Check the temperature sensor via service mode. Note: The approximate resistance values of this NTC are 100kΩ at 77 F (25 C), 5.5kΩ at 212 F (100 C), and 1kΩ at 320 F (160 C). 4. Check the resistance of the temperature sensor at different temperatures and compare to the above values. 5. Replace the temperature sensor, if necessary. 3.4 F4 -- Steam NTC (1R30) Open-Circuited Steam NTC (1R30) open-circuited. 1. Check the connection leads. 2. Replace the connection leads, if necessary. 3. Check the temperature sensor via service mode. Note: The approximate resistance values of this NTC are 100kΩ at 77 F (25 C), 5.5kΩ at 212 F (100 C), and 1kΩ at 320 F (160 C). 4. Check the resistance of the temperature sensor at different temperatures and compare to the above values. 5. Replace the temperature sensor, if necessary. 80

81 3.5 F10 -- No Water Intake Water container inserted incorrectly. Insert the water container correctly. Hose connections interrupted, blocked or kinked. 1. Check hose connections. 2. Replace hoses, if necessary. Water container valve jammed or clogged. 1. Check water container valve. 2. Replace water container, if necessary. Flow meter (B3/4) defective or clogged. 1. See Flow Meter (B3/4) Removal, Section Install a new flow meter. Coffee/hot water pump (2M7) defective. 1. See Coffee/Hot Water Pump Removal, Section Install a new coffee/hot water pump. Water paths need to be descaled. 1. Descale the appliance; see the operating instructions. 2. Replace the coffee/hot-water heater, including the brew-unit hose and spout. Brew unit jammed. Follow the remedy procedure outlined in F73 -- Brew Unit Fault (Page 83). Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 3.6 F17 -- Insufficient Water Intake Water container inserted incorrectly. Insert the water container correctly. 81

82 CVA 4062/CVA 4066/CVA 4068 Coffee Systems Hose connections interrupted, blocked or kinked. 1. Check hose connections. 2. Replace hoses, if necessary. Water container valve jammed or clogged. 1. Check water container valve. 2. Replace water container, if necessary. Flow meter (B3/4) defective or clogged. 1. Install a new flow meter. See Flow Meter (B3/4) Removal, Section Coffee/hot water pump (2M7) defective. 1. Install a new coffee/hot water pump. See Coffee/Hot Water Pump Removal, Section Water paths need to be descaled. 1. Descale the appliance; see the operating instructions. 2. Replace the coffee/hot-water heater, including the brew unit hose and spout. Brew unit jammed. Follow the remedy procedure outlined in F73 -- Brew Unit Fault (Page 83). Warning! In order to avoid possible water system faults (e.g., clogging or blocking of valves), grease, oil or other slip lubricants should never be used when assembling and installing water system parts. 3.7 F28 -- Too Much Ground Coffee in Brew Unit Excessive ground coffee was taken in through the funnel. 1. Remove the ground coffee. 2. Advise the customer about correct dispensing amounts as outlined in the operating instructions. 82

83 3.8 F41 -- EEPROM Faulty/Data Fault EEPROM faulty/data fault. 1. See Control/Display Electronic EPWZ (N5) Removal, Section Install a new control/display electronic. 3.9 F42 -- Line Frequency Not Registered Frequency fluctuations or power-supply interference. None F47 -- No Communication Between Control and Power Electronics Faulty interface between control and power electronics. 1. Check the wiring harness between the control electronic and the power electronic. 2. Replace the wiring harness, if necessary F73 -- Brew Unit Fault 1 Top positioning microswitch (basic setting) (S60/1) 2 Bottom positioning microswitch (pressure setting and drainage setting) (S60/2) Figure 070-1: Brew Unit Positioning Microswitches After the brew unit is activated, if one of the two microswitches has not been activated within approximately 10 seconds, fault code F73 is indicated. Brew unit jammed. 1. Switch off the appliance at the main switch. 2. Remove the brew unit from the appliance. 3. Check if the guide (Figure 070-2, Item 1) is correctly inserted in the brew unit. 83

84 Figure 070-2: Brew Unit Guide 4. In service mode, without the brew unit, initialize the brew unit drive; see Table in Section If initialization is not possible, replace the brew unit drive. See Brew Unit Drive (M26) Removal, Section Note: When re-installing the brew unit drive, make sure that the pawl is in the home position. See Brew Unit Drive, Home Position, Section Microswitch defective or connection leads open-circuited. 1. Check the connection leads. 2. Replace the connection leads, if necessary. 3. Check the microswitch via the service mode; see Table in Section If the microswitch is electrically defective, replace the microswitch. 5. If the microswitch is mechanically defective (cam worn down), replace the cam. 6. If the cam is not available as a separate part, replace the entire brew unit drive. See Brew Unit Drive (M26) Removal, Section Note: When re-installing the brew unit drive, make sure that the pawl is in the home position. See Brew Unit Drive, Home Position, Section F74 -- Ceramic Valve Fault Possible Causes: 1. Ceramic valve (M29) motor defective. 2. Ceramic valve position switch (S60/3) defective. Replace the ceramic valve. See Section

85 3.13 F76 -- Fault during Pressing in Brew Unit The brew unit guide is inserted incorrectly. Re-insert the guide correctly (Figure 070-2, Item 1). Grind amount too high. Reduce the grind amount; see Table in Section Grind level too coarse. Adjust the grind level to a finer setting F77 -- Ceramic Valve Initialization Fault Faulty initializing of ceramic valve. 1. Test the ceramic valve in the service mode; see Table in Section Replace the ceramic valve, if necessary; refer to Section Ceramic valve reference switch (S51/1) defective. Replace the ceramic valve. See Section F80 -- Coffee/Hot Water Heater (2R1) Not Heating Coffee/hot water heater (2R1) not heating. 1. Test the coffee/hot water heater in service mode. 2. Replace the heater, if necessary; see Section The fuse has blown. Replace the fuse F81 -- Steam Heater (1R1) Not Heating Steam heater (1R1) not heating. 1. Test the steam heater in service mode. 2. Replace the heater, if necessary; see Section The fuse has blown. 85

86 Replace the fuse. CVA 4062/CVA 4066/CVA 4068 Coffee Systems Note: In order for the customer to be able to continue to prepare coffee and obtain hot water in the period before the service technician arrives, he or she can switch off the steam system F82 -- Coffee/Hot Water Heater (2R1) Overheating Coffee/hot water heater overheating. The temperature is greater than 266 F (130 C). If the coffee/hot water heater is on steadily and operating temperature limiter F1/8, replace the power electronic; see Section F83 -- Steam Heater (1R1) Overheating Steam heater overheating. The temperature is greater than 356 F (180 C). If the steam heater is on steadily and operating temperature limiter F1/5, replace the power electronic; see Section F94 -- Water Intake Fault During commissioning, the appliance water intake shutoff valve was closed. 1. Shut the appliance off at the main switch. 2. Open the shutoff valve. 3. Confirm the fault message with OK. 4. Switch on the main switch. Hose kinked. Lay the hose such that it is not kinked. During water intake a large quantity of hot water has been dispensed. The top float in the water container has not switched within 5 minutes. Confirm the fault message with OK. During water intake the drip tray has been emptied. The top float in the water container has not switched within 5 minutes. Confirm the fault message with OK. 86

87 During water intake the water container has been emptied. The top float in the water container has not switched within 5 minutes. Confirm the fault message with OK "Replace Drip Tray" Message, Even Though Drip Tray Is Inserted The inserted drip tray or drip tray overflow is occasionally not detected. The drip tray contact springs are dirty or covered with film (rinse aid from the dishwasher). The contacts in the machine are corroded. The spring pressure of the contacts is insufficient. Since machine no , the material of the springs both in the machine and on the drip tray has been modified in order to increase contact strength. Replace the contact springs (mat. no ). Make sure that they are installed correctly. Replace the drip tray (mat. no ). Connectors for the contact springs are incorrectly installed. Check the contact spring connectors "Empty Drip Tray" Message, Even Though Drip Tray Is Not Full The inserted drip tray or drip tray overflow is occasionally not detected. The drip tray contact springs are dirty or covered with film (rinse aid from the dishwasher). The contacts in the machine are corroded. The spring pressure of the contacts is insufficient. Since machine no , the material of the springs both in the machine and on the drip tray has been modified in order to increase contact strength. Replace the springs (mat. no ). Make sure that they are installed correctly. Replace the drip tray (mat. no ). The connection wires to the contact springs for registering the presence of the drip tray are interchanged. Check the contact spring connection plugs. The base plate has filled with water. The drip tray contacts register "drip tray full." 1. Remove the appliance from its cabinet. 2. Remove the top cover. 3. Remove the service door. 4. Use the medicine dropper, mat. no , to remove water from the appliance. 87

88 3.22 "X Servings until Descaling" Shown in Display The maximum permitted flow of coffee/hot water or the maximum time for steam dispensing has been reached. The values monitored for this depend on the set water hardness. See Table Water hardness setting Grains per gallon Approx. figures applicable until "50 servings until descaling" is displayed Max. permitted flow of coffee/hot water [pulses] Total steam dispensing time [min] Max. permitted flow of coffee/hot water [gal (L)] Soft , (200) Medium , (130) Hard , (90) Very hard > 18 72, (60) Table 070-2: X Servings until Descaling versus Water Hardness Descale the appliance; see the operating instructions Empty Waste Container Message, But Waste Container Is Not Full If the waste container has not been emptied in the past 48 hours, the message Empty waste container will automatically appear. No fault! Advise the customer of this automatic message. The waste container was emptied while the appliance was shut off. Emptying of the waste container was not registered by the electronic. After 48 hours the message Empty waste container will appear automatically. No fault! Advise the customer of this automatic message Clean Brew Unit Message Not Displayed Symptom: According to the operating instructions, the Clean brew unit message should appear after 200 uses. Software fault. Clean the brew unit as outlined in the operating instructions. 88

89 3.24 Descaling Is Interrupted Symptom: The machine stalls 1 minute before the end of descaling. Defective triac on the power electronic. Modified power electronic after machine no Power electronic EPL 865, mat. no , for CVA 5060 and CVA 5068 machines; power electronic EPL 866, mat. no , for CVA 5065 machines. Install a new power electronic. See Section Fit Jets in Central Spout Message Displayed Jets are not installed or are incorrectly inserted in main dispenser. Install or re-install jets in the main dispenser Fit Cover over Central Spout Message Displayed The stainless-steel cover is missing from the main dispenser. Install or re-install the stainless-steel cover over the main dispenser, then confirm with OK. 4 Service 4.1 Customer Programming Mode Initial requirements: Switch the appliance on. Accessing: 1. Press < or > until Settings appears in the top row of the display. 2. Press OK. Acknowledgement indicator: Customer programming options are displayed. Options: 1. Touch < or > to scroll to the desired programming function (see Table 070-3). Press OK to select the function. 2. After selecting a function, touch < or > to scroll to the desired option. See Table Press OK to select the option. 3. To go back to the previous menu, touch < or > until Back is marked. Press OK. 89

90 CVA 4062/CVA 4066/CVA 4068 Coffee Systems Save and quit: 1. To save and quit, press OK. 2. To quit without saving any changes, press On/Off. Note: If the language is not set correctly, use the language setting. Factory settings are shown in bold. icon as a guide to get to the Programming Function Language Time Option cestina dansk (Danish) deutsch (German) english espanol (Spanish) francais (French) hrvatski (Croatian) italiano (Italian) magyar (Hungarian) nederlands (Dutch) norsk (Norwegian) polski (Polish) português (Portuguese) slovenscina (Slovene/Slovenian) suomi (Finnish) svenska (Swedish) türkce (Turkish) griechisch (Greek) russisch (Russian) ukrainisch (Ukranian) chinesisch (Chinese) Display On On for 60 seconds No display Description The set language will remain the same even if a reset is performed. The clock is permanently displayed. When the machine is switched off, the clock dims after 60 seconds. The panel does not show the time of day. 12 h Time is shown in 12-hour format. Time Format 24 h Time is shown in 24-hour format. Use the < and > buttons to set the Set e.g., 8:34 current time. 90

91 Programming Function Timer Coffee Jug Prog. the Amount Amount of coffee Pre-Brewing Temperature Option Set Activate Switch on at (e.g., 7:30) Switch off after (e.g., 0:15 for 15 minutes) Switch off at (e.g., 9:00) Select coffee pot size (3 cups to 8 cups) Espresso: ml (60mL) Coffee: ml (125mL) Cappuccino Latte Macchiato Hot milk: 1-80 s (45 s) Milk froth: 1-60 s (42 s) Espresso: ml (60mL) Milk froth: 1-60 s (15 s) Espresso: ml (60mL) Milk froth: 1-60 s (15 s) Hot water: ml (125mL) Espresso 1 7 (4) Coffee 1 7 (4) Cappuccino 1 7 (4) Latte Macchiato Normal Long Without Espresso Coffee Cappuccino 1 7 (4) Minimum Low Medium High Maximum Minimum Low Medium High Maximum Minimum Low Medium High Maximum Description The machine is switched on at the specified time. The appliance will be switched off after the specified interval has elapsed. The machine is switched off at the specified time. Press Start to begin filling the pot. Press OK at any time during filling to abort the process. Press Start, then OK, to begin programming. Press OK as soon as Save appears in the display and the desired amount has been reached. The amount will be saved for all future preparations. When the maximum amount of water or milk is reached, the machine will automatically stop dispensing. Grinding time can be adjusted between 3.9 and 10 seconds. Pre-brew 1.5 seconds. Pre-brew 3 seconds. No pre-brewing. Minimum = 205 F at flow-through heater. Low = 208 F at flow-through heater. Medium = 212 F at flow-through heater. High = 215 F at flow-through heater. Maximum = 219 F at flow-through heater. 91

92 Programming Function Option Description Temperature Automatic Rinse Latte Macchiato Hot Water On Off On Minimum Low Medium High Maximum Minimum Low Medium High Maximum Minimum = 205 F at flow-through heater. Low = 208 F at flow-through heater. Medium = 212 F at flow-through heater. High = 215 F at flow-through heater. Maximum = 219 F at flow-through heater. The appliance rinses when it's switched on, and, after a beverage is dispensed, shortly before it switches off. Automatic rinse is switched off. The steam system is switched on. The appliance uses two heating systems so that milk froth/hot milk and coffee/espresso can be prepared at the same time. The steam system is switched off. If Steam System milk froth or hot milk is rarely required, then the steam system can be switched off in order to save energy. If milk froth Off or hot milk is selected while the steam system is switched off, then the appliance must heat up first. The steam system will remain switched on as long as the machine is not completely shut off afterwards. Lighting Brightness 0 7 (4) Dim to bright. Info No. of drinks Portions until descaling Total beverages Espresso Coffee Cappuccino Latte Macchiato Hot milk Milk froth Hot water The number of servings (total or per beverage) is displayed. The number of servings until descaling is shown. 92

93 Programming Function Safety Option On Description System lock is switched on. The machine can be safeguarded against accidental switch-on. Water Hardness Display Volume Showroom Program Factory Default Off Soft 1 (0-4 grains per gallon) Medium 2 (5-9 grains per gallon) Hard 3 (10-18 grains per gallon) Very Hard 4 (> 18 grains per gallon) Contrast 1 7 (4) Brightness 1 7 (7) Buzzer tones 0 7 (4) Keypad tones 0 7 (4) Demo program Off All settings User profiles Table 070-3: Customer Programming Settings System lock is switched off. Set the water hardness. The water hardness settings affects the calculation for 50 servings until descale. The harder the water, the sooner the message appears. See Table Set the contrast and brightness. Set the buzzer and keypad volumes. The appliance can be used but will not heat. The message Demo mode for dealer only or Demo mode is active for dealer only will be displayed if demo mode has been activated. Press OK to confirm the message. Demo mode is off. All settings that can be modified in customer programming only will be restored to their factory settings. The language will remain and demo mode will stay switched on. Settings that can be modified in either customer programming or service mode will not be affected. All user profiles will be deleted. 4.2 Service Programming Mode Initial requirements: Switch the appliance off. Accessing: 1. Press and hold Hot Water. 2. Press On/Off once. 3. Release Hot Water. 4. Press Hot Water again 5 times; hold on the 5th time until the programming mode is displayed. Note: Access has to be completed within 10 seconds. 93

94 CVA 4062/CVA 4066/CVA 4068 Coffee Systems Acknowledgement indicator: Programming is shown in the display, along with the service programming options. Options: 1. Touch < or > to scroll to the desired programming function (see Table 070-4). Press OK to select the function. 2. After selecting a function, touch < or > to scroll to the desired option. See Table Press OK to select the option. 3. To go back to the previous menu, touch < or > until Back is marked. Press OK. Programming Function Option Description Reset All settings will be restored to their factory settings. However, the language will remain, demo mode will stay switched on and the fault memory will not be cleared. With hard The machine is hooked up to Plumbed plumbing plumbing. 1 Water W/out hard The machine is not hooked up to Model Supply plumbing plumbing. Variants W/dish warmer A dish warmer is connected. Dish W/out dish Warmer No dish warmer. Service warmer 2 Reset Release the descale lock. Descale Back Go back w/out lifting descale lock. Clean Milk Back Go back w/out lifting cleaning lock. Pipework 2 Reset Release the cleaning lock. 2 Back Go back w/out lifting cleaning lock. Brew Unit Reset Release the cleaning lock. Table 070-4: Service Programming Settings 1 2 Functional only in CVA 4066 machines. Descale the appliance, clean the milk pipework, and clean the brew unit after performing service work to avoid damaging the appliance. 94

95 4.3 Service Mode Initial requirements: Switch the appliance off. Accessing: 1. Press and hold Hot Water. 2. Press On/Off once. 3. Release Hot Water. 4. Press Hot Water again 3 times; hold on the 3rd time until the service mode is displayed. Note: Access has to be completed within 10 seconds. Acknowledgement indicator: Service is shown in the display, along with the service options. Options: 1. Touch < or > to scroll to the desired service function (see Table 070-5). Press OK to select the function. 2. After selecting a function, touch < or > to scroll to the desired option. See Table Press OK to select the option. 3. To go back to the previous menu, touch < or > until Back is marked. Press OK. Service Function Option Description ID Number ID number ID number of control electronic. EPX The material number of the Mat.no.var. variant file for the control/display electronic is displayed. EPL ID number ID number of power electronic. Fault Memory OK Delete All logged faults are shown. All saved faults will be deleted. Component Test K1/80 (Dish Warmer) On Off 1: The dish warmer connection is switched on. 0: The dish warmer connection is switched off. M25 (Grinder) On Off 1: The grinder runs. 0: The grinder switches off. 95

96 Service Function Option Description Component Test M26 (Brew Unit) M29 (Ceramic Valve) Initialize Home position Drain position Compressing position Move counterclockwise for set period of time Move clockwise for set period of time Initialize Home position Closed position Hot milk position Pressure release, position 1 Milk froth pressure release Milk froth Hot milk pressure release Pressure release, position 2 Step counterclockwise Step clockwise Continuous clockwise Continuous counterclockwise The brew unit is moved through its positions and then back to the home position. To prevent mechanical damage, always initialize as a last step. The brew unit moves into the specified position. The brew unit moves in the specified direction. The ceramic valve is moved through its positions and then back to the home position. To avoid mechanical damage, always initialize as a last step. The ceramic valve is moved into the home position. The ceramic valve is moved into the closed position. The ceramic valve is moved into the hot milk position. The ceramic valve is moved into pressure release position 1. The ceramic valve is moved into the milk froth pressure release position. The ceramic valve is moved into the milk froth position. The ceramic valve is moved into the hot milk pressure release position. The ceramic valve is moved into pressure release position 2. The ceramic valve is moved counterclockwise. The ceramic valve is moved clockwise. The ceramic valve is moved continuously clockwise. Press OK to stop. The ceramic valve is moved continuously counterclockwise. Press OK to stop. 96

97 Service Function Option 1M7 (Steam Pump) 2M7 (Coffee/Hot Water Pump) 1R1 (Steam Heater) On Off Start Stop On Off Description The steam pump runs. The steam pump is switched off. The coffee/hot water pump runs. The number of pulses from the flow meter will display. If this value is approximately 33, then the water flow is sufficient. If this value is greater than zero but less than 33, then the water flow is insufficient (see Fault Code F17, Section ). If this value is zero, then there is no water flow (see Fault Code F10, Section ). The coffee/hot water pump is switched off. The steam heater heats. The current temperature at the steam heater will be displayed. Only switch on the heater briefly so that it does not get too hot and thus melt the fuse. The steam heater is switched off. Component Test 2R1 (Coffee/Hot Water Heater) On The coffee/hot water heater heats. The current temperature at the coffee/hot water heater will be displayed. Only switch on the heater briefly so that it does not get too hot and thus melt the fuse. Off The coffee/hot water heater is switched off. Y61 (Hot-Water Solenoid) Open Close The solenoid for hot water is opened. The solenoid for hot water is closed. Y62 (Rinsing Solenoid) Open Close The rinsing solenoid is opened. The rinsing solenoid is closed. 1Y63 (Water Supply Valve) On Off 1: The water supply valve is switched on. 0: The water supply valve is switched off. 2Y63 (Water Supply Valve) On Off 1: The water supply valve is switched on. 0: The water supply valve is switched off. 97

98 Service Function Option Component Test Sensor Test 1Y63+2Y63 (Water Supply Valves) Drain System B3/14 (Bean Container) S12/1 (Water Container Minimum Level Switch) S12/2 (Drip Tray Level Switch) S12/3 (Water Container Maximum Level Switch) S12/4 (Milk Container Present/Level Switch) S24 (Door Contact Switch) S51/1 (Ceramic Valve Step Contact Switch) Description 1: The water supply valves are On switched on. 0: The water supply valves are Off switched off. Empty the water container or remove it from the appliance. Press OK to drain the water circuit. The flow meter is monitored. When it no longer registers pulses, the drain process is finished. Repeat Drain draining as necessary until no water remains in the circuit. To avoid damaging water-carrying components, always drain the water system before storing or transporting the machine, especially in winter. Fill the water container with water. Press OK to fill the water circuit. Filling will take place until the water container is empty. Fill Press OK to end the process. To ensure error-free circulation, always fill the system before initial operation. The bean container is empty or 0 not inserted. The bean container is inserted 1 and full. The water container is empty or 0 not inserted. The water container is inserted 1 and full. The drip tray is not inserted or not 0 full. 1 The drip tray is inserted and full. The water container is not 0 inserted or is inserted and full The water container is inserted and empty. The milk container is not inserted or is inserted but empty. The milk container is inserted and full. 1 The door is closed. 0 The door is open. The ceramic valve step contact 0 switch is open. The ceramic valve step contact 1 switch is closed. 98

99 Service Function Option Sensor Test Operating Hours S51/4 (Grind Amount Compensation Microswitch) S60/1, S60/2 (Brew Unit Position Switches) S60/3 (Ceramic Valve Position Switch) S87/1 (Drip Tray Presence Switch) S87/2 (Brew Unit Presence Switch) S87/4 (Waste Container Presence Switch) S87/5 (Ground Coffee Funnel Presence Switch) S87/6 (Dispenser Presence Switch) Total 1R1 2R1 Portions No. of descaling prog. No. of cleaning prog. Table 070-5: Service Mode Description The grind amount compensation 0 switch is open. The grind amount compensation 1 switch is closed. Move the brew unit into the appropriate position using the component test and compare to the switch reading on the display (see Table 070-6). The ceramic valve position switch 0 is open. The ceramic valve position switch 1 is closed. 0 The drip tray is not inserted. 1 The drip tray is inserted. The brew unit is not inserted or is 0 inserted but not locked in place. The brew unit is inserted and 1 locked in place. The waste container is not 0 inserted. 1 The waste container is inserted. 0 The ground coffee funnel is open. The ground coffee funnel is 1 closed. The dispenser is missing or was 0 not pushed in to the switching point. The dispenser is correctly 1 inserted. Espresso Coffee Cappuccino Latte Macchiato Hot milk Milk froth Hot water Clean milk pipework Clean brew unit Total operating hours are shown. Operating hours (pure heating time) of the steam heater are shown. Operating hours (pure heating time) of the coffee/hot water heater are shown. The number of servings is displayed. The number of descales is displayed. The number of cleanings is displayed. 99

100 Display Reading S60/1 S60/2 Brew Unit Position Switch, Top Description Brew Unit Position Switch, Bottom Brew Unit Position 1 0 Closed Open Home position 0 1 Open Closed Compressing position 1 1 Closed Closed Drain position 0 0 Open Open End position top 1 1 Closed Closed End position bottom Table 070-6: Brew Unit Positions 4.4 Power Electronic EPL (N4) Removal 1. Remove the appliance from its cabinet. See Section Remove the three top rear panel retaining screws (two T10s, one T20). 3. Remove the top rear panel. 4. Disconnect all electrical connections from the power electronic. 5. Remove the four power electronic retaining screws (T10); see Figure 070-3, Item Remove the power electronic. Figure 070-3: Power Electronic Retaining Screws 100

101 080 Water Intake (CVA 4066 Only) 101

102 2 Function 2.1 Plumbed Water Line (CVA 4066 Only) The CVA 4066 model is designed for operation with a permanent cold tap water connection, but can be converted from water line to water tank use by programming the plumbed water line connection to On or Off. When the appliance is set to On, it uses the cold-water line. Additionally, the water tank for the CVA 4066 contains two reed switches, one for a low water level and one for a high water level (see Items 13 and 15 in Figure D-4). The water tank is automatically filled when the low water level reed switch sends a signal to the electronic for additional water. When the appliance is set to Off, the water tank is used and must be filled manually with fresh tap water. Refer to Section or the operating manual for further installation information for the CVA 4066 coffee system. 2.2 Safety Concept for Water Intake 2 water inlet valves (1Y63, 2Y63): These solenoids are connected in series in the water path. One solenoid is controlled by the power electronic and one by the control/display electronic. Power electronic (N4), control/display electronic (N5): If one electronic is defective, the second solenoid will be closed by the other electronic. Water container monitoring with 2 float switches (S12/1, S12/3): The bottom float switch monitors the minimum level in the water container. The top float switch switches off the water inlet valves. Water intake duration: The water intake time is monitored. If the top float switch has not switched after 2 minutes, the water inlet valves are closed. Drip tray/appliance base plate: If the presence of water is registered by the drip tray contacts, the water inlet valves are closed. 4 Service 4.1 Water Inlet Filter Removal Note: Whenever a CVA 4066 coffee system is serviced, this requires removing the appliance from a cabinet. After removing the appliance from the cabinet, always remove and clean the water inlet filter as a preventative measure, since this filter is not accessible by the customer. 1. Remove the appliance from its cabinet. See Section Unscrew the brass elbow from the rear of the coffee system (see arrow, Figure 080-1). 102

103 Figure 080-1: Brass Elbow Location 3. Pull out the inlet filter (behind the brass elbow) using needlenose pliers. 4. Check and clean the inlet filter with hot water and a brush. 4.2 Water Inlet Valve (1Y63, 2Y63) Removal 1. Remove the appliance from its cabinet. See Section Remove the top cover retaining screws. 3. Remove the top cover. 4. Remove the service door retaining screws; see Figure 080-2, Item 1. Figure 080-2: Service Door Retaining Screws 5. Release the wiring harness (black cable) connecting the control and power electronics from its guide. 6. Open the service door. 7. Unscrew the brass elbow from the rear of the coffee system (see arrow, Figure 080-1). Remove and clean the water intake filter as a preventative measure. Reinstall the filter. 103

104 8. Disconnect the water inlet valve electrical connections (four wires); mark/label these wires. The valve on the right is the primary valve; valve on the left, the secondary valve. See Figure 080-3, Item Remove the two water inlet valve retaining screws (T20s with washers); see Figure 080-3, Item Pull off the hose; see Figure 080-3, Item 3. Figure 080-3: Water Inlet Valves 1 Water inlet valve electrical connections 2 Water inlet valve retaining screws 3 Hose 104

105 090 Technical Service Bulletins 1 Some CVAs May Experience a Power Electronic TRIAC Failure Symptoms: A machine that hangs during the last two minutes of descaling and has an NTC fault stored in memory is most likely affected by this failure. Machines that stay warm even after several hours of being in standby mode are also likely to have this fault. Some machines will display no obvious symptoms. Models affected: CVA 4062, CVA 4066, CVA 2652, CVA If a CVA 2650 or CVA 2660 was upgraded with a heater conversion kit, this behavior may be seen on these models. Serial number ranges: CVA 406X: * CVA 26X2: * *Be aware that you may encounter 9-digit serial numbers in the near future. Nature of the problem: TRIACS are solid-state devices used to switch AC line voltage on and off. These devices are used in the CVA electronic to control the heaters. In this scenario, when the TRIAC fails, it continues to pass one half of the AC sine wave to the heater continuously (either the coffee or steam heater). This means that the affected heater is being fed with 50% voltage as long as the machine is plugged in and the main power switch is on. Diagnosis: The machine must be plugged in, main power switch on and in standby mode (clock display visible only). Remove the top panel; if the machine has been in standby mode for several hours, neither of the heaters should be warm. Check voltage on both heaters; there should be no AC or DC reading. Use your clamp meter on the live line if it indicates two or more amperes flowing, the machine is faulty. If any of these conditions are present, follow the repair procedure as noted below. Repair: See the tables below for the specific part numbers. 1. Replace the power-control electronic. 2. Replace the NTC. 3. Replace the temperature limiter. If the temperature fuse is open, you must also replace the heater, gaskets, temperature fuse and elbows along with the above parts. All replaced electronics must be returned to Princeton, Attention Engineering Services, and marked with the serial number and incident number. Additionally, you must use the word TRIAC somewhere in the resolution notes. 105

106 CVA TRIAC failure parts matrix: Coffee heater: CVA 4062/CVA 4066/CVA 4068 Coffee Systems Description CVA 4062 CVA 4066 CVA 2652 CVA 2662 Electronic NTC Temp Limiter Heater Fuse Gaskets (4) Elbows / / / / Steam heater: Description CVA 4062 CVA 4066 CVA 2652 CVA 2662 Electronic NTC Temp Limiter Heater Fuse Gaskets (4) Elbows (2) The Display Clock on Models CVA 4062 and CVA 4066 May Change Time Unexpectedly On some CVA coffee systems, the display clock may change suddenly back to 12:00 without any warning or user intervention. This applies specifically to the CVA 4062 and CVA 4066 models. Other functions of the coffee system are not affected. This is a software issue. To resolve it please apply the firmware update provided in the latest version of the MDU software (V ) If you experience any difficulty when connecting to the CVA with the optical interface, remember you may need to turn the machine off for a few seconds using the main power switch. 3 CVA & French Roast Coffee In many cases, customers who use Starbucks or Costco French Roast coffee are experiencing frequent episodes of brew unit blockages. We do not recommend using this style of coffee at this time. The preferred method for brewing French Roast is to use a French Press. Our manufacturing engineers are looking into this situation and if there are any changes, we will announce it here. In the meantime, you can quote this passage from the Starbucks UK Website: GB/_Worlds+Best+Coffee/_Coffee+Detail+Pages/French+Roast.htm Brewing French Roast The best brewing method for French Roast is the coffee press (cafetiere). 106

107 4 CVA Water Tank Cleaning Plumbed CVA appliances CVA 4066 & CVA 4075 When using a plumbed water supply for CVA appliances, there is the possibility that, over time, certain impurities may collect in the water tank. These impurities may exist in many municipal and private water supplies. To remedy this, Germany recommends that the fresh-water tanks in these appliances should be cleaned in the dishwasher every days. There is no fault with the equipment and no reason to replace the tank. 5 CVA 4062 & CVA 4066 Milk Pipework Conversion The factory has designed a new milk pipework scheme for these coffee systems. The purpose of this conversion is to make the pipework more easily accessible to the customer for cleaning. This conversion has also been applied to production machines since early summer The new owner s manual also reflects this conversion and provides new cleaning instructions. The conversion details and instructions can be found on the following pages: As of November 2010, the following part numbers apply: Cover including conversion instructions Central spout connection Central spout Removable milk pipework Danger! Safety glasses must be worn for this procedure. Before starting any service work, the machine must be disconnected from the power supply. Even with the machine switched off, voltage may be applied to some components. Risk of burning or scalding! Components may be hot. Pressurized steam may exist in the system. To avoid the risk of burning, the following should be carried out: The machine should be switched off approximately 1 hour before starting service and repair work to allow the flow-through heaters to cool or Using the service mode, water should be pumped through the flowthrough heaters for approximately 30 seconds to cool them. Note: Service and repair work should only be carried out by suitably qualified persons in accordance with all appropriate local and national safety regulations. Servicing, modification, testing and maintenance of electrical appliances should only be carried out in accordance with all appropriate legal requirements, accident prevention regulations and valid standards. 107

108 1. Open the door. 2. Remove the milk container. 3. Remove the 3 screws securing the right cover (Figure 1, Item 1). 4. Remove the cover. 5. Remove the 5 screws securing the central cover (Figure 1, Item 2). 6. Remove the central cover. 7. Remove the screw securing the coupling piece (Figure 1, Item 3). Figure 1 8. Remove the screw securing the hose holder (Figure 2, Item 3). 9. Remove the hose holder. 10. Pull off the hose from the coupling piece (Figure 2, Item 2). 11. Remove the coupling piece. 12. Remove the screw securing the sensor holder (Figure 2, Item 1). 13. Remove the milk container sensor. 14. Pull off the milk hoses from the central spout connection (Figure 2, Item 4). 108

109 Figure Remove the front stainless-steel fascia piece from the central spout. 16. Remove the central spout from the front. 17. Slide the height adjustment mechanism upwards. 18. Remove the 2 retaining spring clips (Figure 3, Item 1). 19. Pull out the hoses with ground connections. 20. Unclip the microswitch with its housing from below (Figure 3, Item 2) and remove it. 109

110 Figure Remove the 4 screws securing the holder (Figure 4, Item 1). 22. Disconnect the connection to the left light (Figure 4, Item 2). Figure Remove the holder, as well as the complete height adjustment mechanism (Figure 5). 110

111 Figure Remove the 2 screws securing the central spout connection (Figure 6, Item 1). 25. Remove the central spout connection. Figure Install the new central spout connection (Figure 7) in position and carefully tighten the 2 retaining screws (Figure 6, Item 1) by hand only. 111

112 Figure Install the connection holder, taking care to ensure that no connections are trapped, and re-install the 4 retaining screws (Figure 4, Item 1). 28. Reconnect the connection to the left light (Figure 4, Item 2). 29. Remove the 2 O-rings from the old central spout connection and slide them onto the 2 hose connections (Figure 8, Item 1). Figure Re-install the ground connections (Figure 9, Item 1) on the hose connections. 31. Install the hose connections on the central spout connection and re-install the 2 retaining spring clips (Figure 9, Item 2). 112

113 Figure Re-install the microswitch with its housing and clip it in place (Figure 3, Item 2). 33. Re-install all connections in their guides. 34. To ensure that the new cover can be secured, the screw boss (Figure 10, Item 1) must be shortened by exactly 15 mm using diagonal cutters or an appropriate tool. Particular care should be take to work precisely as otherwise the cover will be pressed out or retracted. Figure To ensure that height adjustment is possible, use diagonal cutters or an 113

114 appropriate tool to cut out a corner approximately 12 mm x 12 mm from the height adjustment mechanism (see Figure 11, Item 1). Figure Install the coupling piece in the new cover and re-install the retaining screw (Figure 1, Item 3). 37. Install the hose on the coupling piece (Figure 2, Item 2). 38. Install the hose holder (Figure 2, Item 3) and re-install the retaining screw. 39. Install the milk container with holder (Figure 2, Item 1) and re-install the retaining screw. 40. Lay the sensor connections behind the guide. 41. Install the new cover and re-install the 5 retaining screws (Figure 1, Item 2). 42. Install the new removable milk pipework in the new cover. 43. Install the right cover and re-install the 3 retaining screws (Figure 1, Item 1). 44. Install the milk container. 45. Slide the new central spout upwards from the front until clicking of the microswitch can be heard. 46. Re-install the front stainless-steel fascia piece on the central spout. 6 CVA Door Hose Replacement In some cases, service is necessary to repair a worn or damaged hose leading to the door on one of these coffee systems. Because of the complexity of this assembly, and the need to remove & reapply heat-shrink tubing, a full hose assembly has been made available as a repair part. In the event a repair is needed, use part number

115 7 CVA Replacement Coffee Grinders Should the need arise to replace a grinder assembly in any whole-bean CVA system, be advised that you (or the servicer) may find some coffee residue in the new grinder. This is normal. These grinders are calibrated at the factory using real coffee beans. There is no need to question the fact that this is a new part. 8 CVA 406X Hot Milk Temperatures In some cases, customers prefer to have hotter milk temperatures when making cappuccino or latte macchiato. The temperature of the hot milk & froth should be 54 C +/- 4 C ( F). If the temperatures are not in this range, replace the coupling connector, part number (#23 & #24 on the parts diagram). In order to get the best temperature results when dispensing latte macchiato, decrease the milk component by one-third, and increase the froth component by the same amount. This can be done in programming mode under Manually Setting Beverage Sizes. 115

116 Setting Ranges Factory Setting Espresso ml 60mL Coffee ml 125mL Cappuccino Espresso ml 60mL Milk froth 1 60 s 15 s Espresso ml 60mL Latte Macchiato Milk froth 1 60 s 15 s Hot milk 1 80 s 15 s Hot milk 1 80 s 45 s Milk froth 1 60 s 42 s Hot water ml 125mL 9 Understanding CVA 40xx Temperature Fuses The CVAs have temperature fuses on both the coffee and steam heaters. These fuses are SODs (single-operation devices) designed to protect the system from a runaway heater scenario. The heaters are controlled by NTC feedback to the electronic and energized via a TRIAC. TRIACS are power transistors designed to switch high-current AC devices on and off. As a second layer of temperature control, the heaters have self-resetting bimetal thermostats which interrupt the AC power to the heater at a predetermined 116

117 temperature (steam = 160 C; coffee = 116 C). As a final layer of protection, the temperature fuses are calibrated to open at 216 C. Once this fuse opens, the heater will no longer operate. Runaway Heater Scenario: In some cases, a TRIAC can fail. This device can fail open or shorted. If it fails open, AC power can no longer be sent to the heater. If it fails shorted, it will continuously deliver AC to the heater, regardless of the NTC feedback. At this point, the heater will cycle based on its bimetal self-resetting thermostat. Since this is a mechanical device being stressed in this scenario, it also can possibly fail. Once this happens, the heater can run away and possibly damage other components or the entire appliance. This is where the temperature fuse will activate and shut the heater down permanently. This is not the only scenario that can cause runaway heat. Other causes could be a faulty NTC or an internally shorted heater. If you find a heater with an open temperature fuse: During the diagnosis process, if you find that a temperature fuse has opened, all of the other parts in this circuit should be suspect. 1. Ohm out the heater element (steam = 12.5Ω and coffee = 12.7Ω) and be sure to check both ends of the element against the heater case (ground). This should read infinity ( ). If either of these tests fail, the heater is bad. The heater may have caused the electronic to fail. 2. Disconnect the heater and see if voltage is present (with the machine turned off via the electronic, not the mains switch). If voltage is present, the electronic is bad. 3. Ohm out the NTC sensor (approx 130kΩ at room temp.) and make sure its resistance decreases as you warm it up. If in doubt, replace it. 4. Once the determination has been made, the parts should be replaced, and in all cases, replace the appropriate bimetal self-resetting thermostat. To replace the temperature fuse, the part designated for the CVA 2650 will work. Currently, the temperature fuses are not listed under the CVA 40xx models in the parts CD. We expect that to change in the near future. 10 CVA 406x & MDU Updates When accessing a CVA coffee system with the MDU, you may see an indication that a software update is available (or required). Before attempting an update, check the serial number, because some earlier electronics will not accept this update. Any serial below must have the EPX (control electronic) replaced first. Use part number or later. Remember, when preparing to apply an update with the MDU, double-click the update to view the details page. There will also be a link on the details page with more specific information. 117

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