TECHNICAL INFORMATION DG 408x Steam Ovens

TECHNICAL INFORMATION DG 408x Steam Ovens 2012 Miele USA

Table of Contents A Warning and Safety Instructions... 5 B Modification History... 5 C Technical Data... 5 D Component Layouts... 7 1 Appliance Overviews... 7 2 Electrical Components... 9 010 Casing... 11 1 Technical Data... 12 2 Function... 12 2.1 Air and Vapor Ducting... 12 2.2 Fan Coastdown... 13 2.3 Door Contact Switch (S24)... 13 2.4 Release Element (Y56) for Steam Reduction... 13 3 Fault Repair... 14 3.1 Fan Coastdown Too Long... 14 3.2 Top Clearance Too Small When Combined with Warming Drawer (DG 4080)... 14 4 Service... 15 4.1 Removing the Appliance from its Niche... 15 4.2 Removing the Side Panels... 15 4.3 Rear Panel Removal... 16 4.4 Fan (M2/1) Removal... 17 4.5 Removing the Door Contact Switch (S24)... 18 4.6 Upper Air Duct Removal... 18 4.7 Fan Wheel Removal... 20 020 Door... 21 3 Fault Repair... 22 3.1 Whistling Sound When Closing the Door... 22 4 Service... 22 4.1 Door Removal... 22 4.2 Installing the Door... 23 4.3 Door Disassembly... 23 030 Oven Cavity... 24 1 Technical Data... 25 2 Function... 25 2.1 Floor Heater Element... 25 2.2 PT 1000 Temperature Sensor (R30 or R30/10)... 25 4 Service... 25 4.1 PT 1000 Temperature Sensor (R30 or R30/10) Removal... 25 4.2 Removing the Floor Heater Element (R28)... 26 4.3 Floor Heater Temperature Regulator (2F1) and Temperature Limiter (2F8) Removal... 28 040 Water Tank... 29 1 Technical Data... 30 2 Function... 30 2.1 Steam Generation... 30 3 Fault Repair... 31 3.1 Appliance Does Not Heat... 31 3.2 Appliance Heats Too Slowly... 31 2

3.3 Appliance Generates Strong Steam at First Use, or After a Power Outage/Reset 32 3.4 Appliance Appears to be Incorrectly Installed... 32 3.5 Steam Generator is Discolored... 32 4 Service... 33 4.1 Checking the Resistance of the Steam Generator Heater (1R25, 2R25)... 33 4.2 Removing the Steam Generator Heater (1R25, 2R25)... 34 4.3 Removing the Steam Generator Temperature Regulator (1F1) and Temperature Limiter (1F8)... 34 4.4 Removing the Steam Duct and Seal... 35 4.5 Accessing the Tank Float/Float Switch Actuating Magnet (DG 4080 Only)... 36 4.6 Removing the Reed Contact Float (PCB) (S12)... 36 4.7 Removing the Steam Generator Present Switch (S84)... 37 4.8 Removing the Steam Generator Socket... 37 060 Fascia, Electronics... 38 2 Function... 39 2.1 Optical Interface... 39 2.2 Electronics Overview... 40 2.3 Warming Function... 41 2.4 Power Management... 41 2.5 Descaling... 41 3 Fault Repair... 42 3.1 Fault Code Summary... 42 3.2 F05 - Short Circuit in PT 1000 Temperature Sensor... 42 3.3 F06 - Open Circuit in PT 1000 Temperature Sensor... 42 3.4 F20 - Heating Fault... 42 3.5 F44 - Control Electronic/Power Electronic Interface is Faulty... 44 3.6 Displays Look Different... 44 3.7 Wrong Language Setting... 44 3.8 Display Dims... 44 3.9 Time of Day Shown in 12-Hour Format/24-Hour Format... 44 3.10 Cooking Program Does Not Start... 45 3.11 Excessive Steam in the Oven Cavity... 45 3.12 Cooked Food Is Not Kept Warm... 45 3.13 Recommended Temperatures Are Changed... 45 3.14 Display Is Hard To Read... 45 3.15 Buzzer at the End of a Cooking Cycle is Too Loud/Soft/Short... 45 3.16 When Touching a Keypad, Tone is Too Loud or Too Soft... 46 3.17 System Lock Is Possible/Not Possible... 46 3.18 Temperature in C / F... 46 4 Service... 46 4.1 Programming Mode... 46 4.2 Service Mode... 49 4.3 Removing the Fascia Panel Assembly... 51 4.4 Removing the Control Electronic (DG 4082)... 53 4.5 Removing the Selection Electronic... 53 070 Technical Service Bulletins... 54 1 DG 4080 Steam Oven Displays F20 in a New Installation... 54 List of Figures Figure D-1: Overview of DG 4080 (Front View)... 7 Figure D-2: Overview of DG 4082 (Front View)... 8 Figure D-3: DG 4080 Electrical Components... 9 Figure D-4: DG 4082 Electrical Components... 10 3

Figure 010-1: Ducting... 12 Figure 010-2: Screws on the Bottom of the Appliance (DG 4080)... 15 Figure 010-3: Appliance Retaining Screws... 15 Figure 010-4: Side Panel Screws (DG 4082 Shown)... 16 Figure 010-5: Rear Panel Screws... 16 Figure 010-6: Fan Screws and C-Clip... 17 Figure 010-7: Fan Connections... 17 Figure 010-8: Door Contact Switch Removal... 18 Figure 010-9 Fascia Fastening Screws... 19 Figure 010-10: Upper Air Duct Retaining Screws and Hose... 19 Figure 010-11: Silicone Seal... 20 Figure 010-12: Front Lugs... 20 Figure 020-1: Hinge Clamps... 22 Figure 020-2: Door Removal... 22 Figure 020-3: Door Handle Removal... 23 Figure 030-1: Temperature Sensor R30 Removal (DG 4080)... 26 Figure 030-2: Temperature Sensor R30/10 Removal (DG 4082)... 26 Figure 030-3: Floor Heater Cover... 27 Figure 030-4: Floor Heater Removal (DG 4080)... 27 Figure 030-5: Floor Heater Removal (DG 4082)... 28 Figure 040-1: Steam Generator... 30 Figure 040-2: Hose Clamp... 32 Figure 040-3: Steam Generator Heater Contacts... 33 Figure 040-4: Housing Base... 34 Figure 040-5: Steam Generator Temperature Regulator and Temperature Limiter... 35 Figure 040-6: Steam Duct Retaining Screws... 35 Figure 040-7: Removing the Top Cover from the Steam Duct Assembly... 36 Figure 040-8: Reed Contact Float... 37 Figure 040-9: Steam Generator Present Switch... 37 Figure 060-1 Optical Interface... 39 Figure 060-2: EPL700 Electronic Overview (DG 4080 Shown)... 40 Figure 060-3: AC Power Electrical Circuit (DG 4080)... 41 Figure 060-4: Fascia Panel Assembly (DG 4080)... 51 Figure 060-5: Control Electronic Screws (DG 4080)... 52 Figure 060-6: Fascia Panel (DG 4082)... 52 Figure 060-7: Removing the Control Electronic (DG 4082)... 53 List of Tables Table C-1: US Data Sheet... 6 Table 010-1: Cooling Fan Data... 12 Table 030-1: Floor Heater Data... 25 Table 030-2: PT 1000 Temperature Sensor Resistance Values... 25 Table 030-3: Threshold Temperatures... 25 Table 040-1: Steam Generator Data... 30 Table 060-1: Fault Codes... 42 Table 060-2: Programming Mode... 49 Table 060-3: Service Mode... 50 4

A Warning and Safety Instructions Service may only be carried out by qualified electricians and in keeping with the appropriate safety regulations. All applicable guidelines, accident prevention rules and laws must be observed. Before service or repair work can be started, all cables carrying power must be safely disconnected. Even when the appliance is disconnected from power, elements may carry voltage. A general visual check must be performed at all times. A touch current measurement must be conducted on all conductive parts that are not connected to ground. Wear protective gloves and use the edge protection (mat. no. 5057680) to prevent cuts by sharp edges. B Modification History When? Who? What? 2/2/2012 Jessica Naples Tech service bulletins added 5/27/2010 Jessica Naples Compilation for Website C Technical Data Figure C-1: DG 408x 5

Model DG 4080 DG 4082 Design Steam oven Steam oven Construction Built-in Built-in Door stop Bottom Bottom Dimensions Appliance dimensions H x W x D 18.0 x 23.4 x 18.2 17.9 x 23.6 x 16.7 Depth with door open 30.8 30.8 Niche dimensions Height 17.6 17.8 17.7 Width 22.0 22.4 22.0 22.4 Depth min. 19.7 min. 19.7 Weight 59.4 lbs 61.8 lbs Capacity 0.88 cu. ft. 0.88 cu. ft. Cavity height 9.4 9.5 Cavity base dimensions W x D 13.2 x 14.4 13.2 x 14.4 Levels in cavity (for racks) 4 (incl. 1 for condensate tray) Equipment Vapor cooling system X Water supply hookup System lock during operation X Oven cavity floor heater X Automatic steam reduction X Recipe book X Water tank capacity 1.3L Operational features Standard text display X Recessed controls X Temperature control 104 212 F Automatic shutoff X Fault indication X Door contact switch X Programmable cooking time X Use of residual energy X Steady water level indicator X Warming function X Operating modes Cooking levels 4 Heat X Defrost X Descale X Automatic programs X Own favorites X Interference suppressed X Heaters Floor heater 300W 350W Steam generator 2200W 2200W Power connection Voltage (208) 240 VAC 240VAC Frequency 60Hz 60Hz Electrical connection NEMA 6-15 NEMA 6-15 Connected load 2500W 2700W Fuse (circuit breaker) rating 15A 15A Table C-1: US Data Sheet 6

D Component Layouts 1 Appliance Overviews Figure D-1: Overview of DG 4080 (Front View) 1 Door release 2 Control panel 3 Air vent 4 Door seal 5 Steam channel 6 Steam generator (with insert) 7 Steam generator compartment 8 Steam generator electrical connection 9 Runners (4) 10 Steam port 11 Drip channel 12 Floor heater 13 Temperature sensor 14 Vent port 7

Figure D-2: Overview of DG 4082 (Front View) 1 Control panel 2 Door release 3 Air vent 4 Door seal 5 Steam channel 6 Steam generator compartment 7 Steam generator (with insert) 8 Steam generator electrical connection 9 Runners 10 Steam port 11 Drip channel 12 Floor heater 13 Temperature sensor 14 Air vent 8

2 Electrical Components Figure D-3: DG 4080 Electrical Components 1 (2F1, 2F8) Floor heater temperature regulator (239 F) and temperature limiter (402 F) 2 (S4) Door contact switch 3 (R28) Floor heater 4 (1N1) Selection electronic EW 5 (2N1) Control electronic EPX 6 (3N1) Power electronic EPL (1K1/1, 2K1/1) Steam generator relay (not shown) (K1/3) Floor heater relay (not shown) (K1/5) Fan relay (not shown) (K1/61) Release element relay (not shown) 7 (Z2) Interference suppression capacitor 8 (Y56) Release element 9 (X2) Socket for power cable 10 (X7) Plug strip 11 (R30) PT1000 temperature sensor 12 (M2) Fan 13 (S12) Water level float switch (PCB) 14 (S84) Steam generator present switch 15 (1R25, 2R25) Steam generator heater elements 16 (1F1, 1F8) Steam generator temperature regulator (410 F) and temperature limiter (568 F) 9

Figure D-4: DG 4082 Electrical Components 1 (2F1, 2F8) Floor heater temperature regulator (239 F) and temperature limiter (402 F) 2 (R28) Floor heater 3 (S4) Door contact switch 4 (2N1) Control/selection electronic EW 5 (R30/10) PT1000 temperature sensor 6 (1N1) Power electronic 7 (X2) Power socket 8 (Z2) Interference suppression capacitor 9 (Y56) Release element 10 (X7) Plug strip 11 (M2/1) Cooling fan 12 (S84) Steam generator switch 13 (S12) Water level float switch (PCB) 14 (1R25, 2R25) Steam generator heater 15 (1F1, 1F8) Steam generator temperature regulator (410 F) and temperature limiter (568 F) 10

010 Casing DG 4080 DG 4082 11

1 Technical Data Cooling fan M2 (DG 4080) or M2/1 (DG 4082) Voltage 240VAC, 60Hz Output 15W Table 010-1: Cooling Fan Data 2 Function 2.1 Air and Vapor Ducting Figure 010-1: Ducting 1 Steam inlet 2 Oven vent hose 3 Cool air/vapor outlet 4 Cool air inlet 5 Release element for steam reduction (door opener) 6 Steam vent hose During the cooking process, fresh steam is pumped into the oven cavity (Figure 010-1, Item 1). The generated vapors are pushed out through the vent opening. Through a hose at the rear of the oven cavity, the vapors move 12

to the air duct (Figure 010-1, Item 2). The fan draws in cool air through the air vents in the housing, and the cool air mixes with the vapors in the air duct (Figure 010-1, Item 4). The cool air/vapor mix is expelled through the gap between the fascia and the oven cavity (Figure 010-1, Item 3). Excess steam from the steam generator is carried directly to the fan via the vent hose (Figure 010-1, Item 6) and pushed out at the front of the appliance. Shortly before cooking time is up, relay K1/61 activates the release element, which causes a metal rod to slowly open the door a crack. This reduces the steam in the oven cavity. See Figure 010-1, Item 5. Once the buzzer sounds to indicate the end of cooking time, the door slowly closes. 2.2 Fan Coastdown To reduce the vapors that are still in the oven cavity after cooking has ended, the fan continues running after the appliance is switched off. This prevents steam from settling on the fascia of the cabinetry when opening the door condensate from forming in the housing by residual steam. Coastdown duration depends on whether or not the steam generator has been removed from the appliance after the cooking process. Warm cooked food in the appliance delays the cooling and leads to a longer coastdown time. Coastdown time is not adjustable! If steam generator was removed: Coastdown takes at least 8 minutes. If after the first 8 minutes the interior temperature has not dropped below 113 F (45 C), then the coastdown time is extended for an additional 8 minutes until the interior temperature drops below 113 F (45 C). If steam generator was not removed: Coastdown takes at least 60 minutes. If after the first 60 minutes the interior temperature has not dropped below 113 F (45 C), then the cooldown time is extended for an additional 8 minutes until the interior temperature drops below 113 F (45 C). 2.3 Door Contact Switch (S24) If the door is opened during the cooking process, the door contact switch signals the control electronic, which switches off the steam generator heater (1R25, 2R25). Note: With the door open a crack, new cooking selections can be made. However, the steam generator heater will not be switched on for approximately one to two minutes. 2.4 Release Element (Y56) for Steam Reduction Shortly before cooking time is up, relay K1/61 activates the release element, which slowly opens the door a crack. This reduces the steam in the oven cavity. After the buzzer sounds to signal the end of cooking time, the door slowly closes again. While the door is open a crack, new cooking selections can be made. However, the steam generator heater will not be switched on for approximately one to two minutes. 13

3 Fault Repair 3.1 Fan Coastdown Too Long Symptom: Coastdown is at least 8 minutes and can be more than 60 minutes. Steam generator remains in the appliance after cooking has ended. Coastdown duration depends on whether or not the steam generator has been removed from the appliance after the cooking process. Warm cooked food in the appliance delays the cooling and leads to a longer coastdown. Coastdown time is not adjustable! Steam generator was removed: Coastdown takes at least 8 minutes. If after the first 8 minutes the interior temperature has not reduced to below 113 F (45 C), then the coastdown is extended for an additional 8 minutes until the interior temperature drops below 113 F (45 C). Steam generator was not removed: Coastdown takes at least 60 minutes. If after 60 minutes the oven cavity temperature has not dropped below 45 C, the coastdown duration is extended in increments of 8 minutes until the oven cavity temperature is below 45 C. In addition, if food remains in the oven cavity, the cooling-off period is delayed and causes a longer coastdown. 1. Remove steam generator and cooked food after a cooking program. 2. Leave door open. 3. Empty steam generator before inserting it again. 3.2 Top Clearance Too Small When Combined with Warming Drawer (DG 4080) Symptom: When combining the appliance with the built-in EGW 4000 warming drawer, the clearance on top to the cabinetry is too small. This becomes particularly obvious if other Miele machines are built in next to it. Two screw heads at the bottom of the appliance meet exactly with rivets at the top of the EGW 4000 warming drawer. This causes the appliance to be positioned slightly higher, and the gap within the cabinetry to be insufficient to allow proper installation. Series modification: The position of the rivets on the warming drawer has been changed so that the screw caps will not meet the rivets. Note: Both screws can be permanently removed, since they are only used during production and will not have any adverse effects if removed. Remove both screws (Figure 010-2, Item 1). 14

Figure 010-2: Screws on the Bottom of the Appliance (DG 4080) 4 Service 4.1 Removing the Appliance from its Niche 1. Open the door. 2. Take the steam generator and equipment out of the oven cavity. 3. Remove the appliance retaining screws (Figure 010-3, Item 1). 4. Slide the appliance out of its niche. 5. Disconnect the appliance from the power supply. Figure 010-3: Appliance Retaining Screws 4.2 Removing the Side Panels 1. Uninstall the appliance. See Section 010-4.1. 2. Remove the side panel screws; see Figure 010-4, Item 1. 3. Take off the side panel(s). 15

Figure 010-4: Side Panel Screws (DG 4082 Shown) 4.3 Rear Panel Removal 1. Uninstall the appliance. See Section 010-4.1. 2. Remove the T20 screws securing the rear panel (Figure 010-5, Item 1). 3. Remove the rear panel. Figure 010-5: Rear Panel Screws 16

4.4 Fan (M2/1) Removal 1. Uninstall the appliance. See Section 010-4.1. 2. Remove the right side panel. See Section 010-4.2. 3. Remove the screws securing the fan (Figure 010-6, Item 1). 4. Remove the C-clip securing the blower wheel (Figure 010-6, Item 2). 5. Turn the blower wheel as necessary to permit access to the motor mounting screws. Figure 010-6: Fan Screws and C-Clip 6. Disconnect hoses (Figure 010-7, Item 1) as necessary to access the fan motor from the underside of the air duct. 7. Raise the air duct slightly (Figure 010-7, Item 2) and take out the fan motor (Figure 010-7, Item 3). 8. Disconnect all fan connections. Figure 010-7: Fan Connections 17

4.5 Removing the Door Contact Switch (S24) 1. Uninstall the appliance. See Section 010-4.1. 2. Remove the left side panel. See Section 010-4.2. 3. Unhook the door spring (Figure 010-8, Item 1). 4. Remove the two Phillips screws (Figure 010-8, Item 2). 5. Remove the switch from its support plate. 6. Disconnect the switch connections (Figure 010-8, Item 3). DG 408x Steam Ovens Figure 010-8: Door Contact Switch Removal 4.6 Upper Air Duct Removal 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the side panels. See Section 010-4.2. 4. Remove the rear panel. See Section 010-4.3. 5. Remove four screws securing fascia panel (Figure 010-9, Item 1, left and right sides). 18

Figure 010-9 Fascia Fastening Screws 6. Remove the fascia/support panel assembly. 7. Disconnect plug ST3 from the electronic, and remove wiring from the top of the ducting. 8. Remove 17 screws (Figure 010-10, Item 1). 9. Disconnect the hose (Figure 010-10, Item 2). Figure 010-10: Upper Air Duct Retaining Screws and Hose 10. Using an appropriate tool, slice open the silicone seal (Figure 010-11, Item 1). 19

Figure 010-11: Silicone Seal 11. Slide the upper duct assembly back to release the front lugs from the frame (Figure 010-12). Lift the assembly upward to remove. Figure 010-12: Front Lugs Warning! When re-installing the upper air duct, the silicone has to be replaced to seal the air duct. The front lugs on the upper air duct are fragile and break off easily! 4.7 Fan Wheel Removal 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the side panels. See Section 010-4.2. 4. Remove the rear panel. See Section 010-4.3. 5. Remove the upper air duct; see Section 010-4.6. 6. Remove the C-clip (Figure 010-6, Item 2). 7. Remove the fan wheel. 20

020 Door DG 4080 DG 4082 21

3 Fault Repair 3.1 Whistling Sound When Closing the Door Symptom: When the oven is in a heated state and the oven door is opened and then closed again, there is a whistling sound. When opening the door, cool air gets into the oven cavity. The cool air expands in the hot oven cavity and slightly increases the pressure when the door is closed. None. The appliance is in good working order. The whistling sound cannot be eliminated. 4 Service 4.1 Door Removal 1. Open the door to the fully open position. 2. Flip up the clamp arms on both hinges (Figure 020-1). Figure 020-1: Hinge Clamps 3. Slowly close the door until the clamps are touching the frame of the oven interior. 4. While holding the door with both hands, lift the door until the hinges disengage. Remove the door. See Figure 020-2. Figure 020-2: Door Removal 22

4.2 Installing the Door 1. Place the door on the hinges and slide it down. 2. Open the door fully. 3. Push the clamps back down. 4. Close the door. 4.3 Door Disassembly 1. Door removal 2. Lay the door on a soft work surface (mat or cloth), with the inner side facing up. 3. Remove 3 Phillips screws on the bottom edge of the inner door (Figure 020-3, Item 1). 4. DG 4082 only: Remove 4 Phillips screws from the top of the inner door (Figure 020-3, Item 2). 5. Take off the inner door. 6. Remove the 2 Phillips screws securing the door handle (Figure 020-3, Item 3). 7. Remove the door handle. Figure 020-3: Door Handle Removal Note: When assembling the door, make sure to carefully position the seal running along the edges of the inner door. Ensure that the seal is seated and remains flush with the edge of the glass. 23

030 Oven Cavity DG 4080 DG 4082 24

1 Technical Data Floor heater (R28) Output power 300W (DG 4080); 350W (DG 4082) Table 030-1: Floor Heater Data PT 1000 Temperature Sensor (R30 or R30/10) Temperature ( C) Temperature ( F) Resistance (Ω) 0 32 1000 20 68 1078 25 77 1097 30 86 1117 50 122 1194 100 212 1385 150 302 1573 200 392 1758 250 482 1941 300 572 2120 Table 030-2: PT 1000 Temperature Sensor Resistance Values Threshold temperature Floor heater temperature regulator (2F1) 239 F Floor heater temperature limiter (2F8) 402 F Table 030-3: Threshold Temperatures 2 Function 2.1 Floor Heater Element The floor heater element is located in the center of the oven cavity floor, and prevents water from condensing and accumulating at the bottom of the oven cavity. 2.2 PT 1000 Temperature Sensor (R30 or R30/10) The PT 1000 temperature sensor is a printed circuit board (PCB) which is used to provide the electronic with data to calculate the oven cavity temperature. The sensor s resistance increases as the temperature increases. Details are listed in Table 030-2. 4 Service 4.1 PT 1000 Temperature Sensor (R30 or R30/10) Removal 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the side panels. See Section 010-4.2. 4. Remove the rear panel. See Section 010-4.3. 5. Slide or move insulation as necessary. 6. DG 4080: Disconnect the temperature sensor (Figure 030-1, Item 1) from the power electronic. Take off the retaining clip (030-Figure 1, Item 2). 25

Remove the temperature sensor from its seal. Figure 030-1: Temperature Sensor R30 Removal (DG 4080) 7. DG 4082: Disconnect the ground wire from the temperature sensor, and the temperature sensor wiring harness from the power electronic. See Figure 030-2, Item 1. Remove the temperature sensor from its seal. Figure 030-2: Temperature Sensor R30/10 Removal (DG 4082) 4.2 Removing the Floor Heater Element (R28) 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 26

3. Tip the appliance onto its back. 4. Use a pair of diagonal cutters to snip the lugs securing the cover to the base (Figure 030-3). Remove the cover. Figure 030-3: Floor Heater Cover 5. DG 4080: Remove the 7mm nut securing the ground wire (Figure 030-4, Item 1). a. Disconnect the ground wire. b. Take off the retaining clip. c. Remove the inner 7mm retaining nut (Figure 030-4, Item 2). d. Take off the clip and the heater assembly. e. Disconnect all electrical connectors to the heater element. f. Push the heater element into the oven cavity. Figure 030-4: Floor Heater Removal (DG 4080) 6. DG 4082: Cut the cable tie (Figure 030-5, Item 1). a. Remove the nut securing the ground wire (Figure 030-5, Item 2). b. Disconnect the ground wire. c. Take off the retaining bracket (Figure 030-5, Item 3). d. Disconnect the heater connections (Figure 030-5, Item 4). e. Push the heater element into the oven cavity to remove. 27

Figure 030-5: Floor Heater Removal (DG 4082) Note: Make sure that the seal is installed properly when installing the heater element. When re-installing the cover, rotate it slightly (one-quarter turn) and screw into place. To prevent adverse operation make note of (or mark) all electrical connections during disassembly, so they can be connected correctly during reassembly. 4.3 Floor Heater Temperature Regulator (2F1) and Temperature Limiter (2F8) Removal 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Tip the appliance onto its back. 4. Using a pair of cutters, remove the cover from the base (Figure 030-3). 5. Remove the 7-millimeter nut securing the ground wire (Figure 030-4, Item 1). 6. Disconnect the ground wire. 7. Take off the retaining bracket. 8. Remove the retaining nut (Figure 030-4, Item 2). 9. Take off clip with temperature regulator and temperature limiter. 10. Remove connectors to temperature regulator and temperature limiter. 28

040 Water Tank 29

1 Technical Data Steam Generator Heater (1R25, 2R25) Output Temperature Regulator (1F1) Threshold Temperature Temperature Limiter (1F8) Threshold Temperature Table 040-1: Steam Generator Data 1 Depends on distributor 2 x 1.1kW 410 F (DG 4080); 410 F or 482 F (DG 4082) 1 568 F (DG 4080); 568 F or 604 F (DG 4082) 1 2 Function 2.1 Steam Generation 1 Inner chamber 2 Outer chamber 3 Float 3a Magnet 4 Water level float switch (PCB) (S12) 5 Steam generator present switch (S84) 6 Steam generator heater (1R25, 2R25) Figure 040-1: Steam Generator 2.1.1 Construction The insert divides the steam generator into an inner chamber (Figure 040-1, Item 1) and an outer chamber (Figure 040-1, Item 2). Both chambers are connected by an opening. The steam generator is equipped with dual heater 30

elements (1R25, 2R25), (Figure 040-1, Item 6), to heat the water in the inner chamber. As water evaporates from the inner chamber, it is automatically replenished with water from the outer chamber. 2.1.2 Water Level The electronic continuously displays the water level, which is automatically calculated by the electronic using a float (with magnet) within the steam generator (Figure 040-1, Items 3 and 3a) and the water level float switch (S12) (Figure 040-1, Item 4). After a pre-set heating countdown, the steam generator heater element steam switches off and the display prompts the user to add water. 2.1.3 Steam Generator Present Switch (S84) The steam generator present switch registers if the steam generator is installed in the appropriate position. 2.1.4 Heating The steam generator can only be activated when The steam generator switch is activated by the presence of the steam generator (Figure 040-1, Item 5) The water level float switch registers a sufficient quantity of water is present within the steam generator (Figure 040-1, Item 4) The oven door is closed. During the heating-up phase, generally both heater circuits are activated. In the maintenance phase, after the required temperature has been reached, only one heater circuit is cycled (on/off) to maintain the oven cavity temperature. If the temperature drops below a certain threshold, e.g., after the oven door is opened, both heater elements may be activated. 3 Fault Repair 3.1 Appliance Does Not Heat 1. Ensure that the appliance is electrically connected to the proper supply. 2. Ensure that the appliance is NOT in the demonstration mode. 3. Ensure that the proper steam generator is being used. If a steam generator from a different model number (e.g., DG 2xxx) is used it can result in adverse operation. 3.2 Appliance Heats Too Slowly 1. Ensure that the appliance is electrically connected to the proper supply. 2. Ensure that the appliance is NOT in the demonstration mode. 3. Ensure that the proper steam generator is being used. If a steam generator from a different model number (e.g., DG 2xxx) is used it can result in adverse operation. 31

3.3 Appliance Generates Strong Steam at First Use, or After a Power Outage/Reset Automatic altitude adjustment. After the first cooking process at 212 F and as part of the descaling process, the boiling temperature is automatically adjusted to the altitude of the location. None needed. 3.4 Appliance Appears to be Incorrectly Installed Symptom: The hose clamp (Figure 040-2, Item 1) is positioned on the middle of the hose. Figure 040-2: Hose Clamp No error. The hose clamp serves as kink prevention. The hose clamp prevents kinks that get into the hose at this point, which would reduce the diameter of the hose. The clamp is not meant to keep the hose in place. None. Leave the hose clamp in its position. 3.5 Steam Generator is Discolored Symptom: Steam generator and insert are discolored yellow. Light exposure. This is only a cosmetic problem. Quality and function of the steam generator are not diminished. To avoid this, do not expose the steam generator to daylight for longer periods of time. 32

4 Service 4.1 Checking the Resistance of the Steam Generator Heater (1R25, 2R25) Note: The steam generator heater consists of two heaters (240V/1100W), which are switched in parallel. 1. Heater element 1R25: Using an ohmmeter, measure the resistance between contact points 2 and 3 (Figure 040-3). If the measured value is approximately 100Ω, the heater element is in good condition. 2. Heater element 2R25: Using an ohmmeter, measure the resistance between contact points 1 and 3 (Figure 040-3). If the measured value is approximately 50Ω, the heater element is in good condition. 3. Heater elements 1R25 and 2R25: Using an ohmmeter, measure the resistance between contact points 1 and 2 (Figure 040-3). If the measured value is approximately 50Ω, the heater elements are in good condition. Figure 040-3: Steam Generator Heater Contacts 33

4.2 Removing the Steam Generator Heater (1R25, 2R25) DG 408x Steam Ovens Note: The heater is integrated into the steam generator housing. Should a heater element require replacement, the steam generator must be replaced as an assembly. The heater elements are not replaced separately. 1. Open the door. 2. Remove the steam generator. 3. Remove the insert from the steam generator housing. 4.3 Removing the Steam Generator Temperature Regulator (1F1) and Temperature Limiter (1F8) 1. Open the door. 2. Remove the steam generator. 3. Remove the insert from the steam generator housing. 4. Remove the bottom cover from the housing by gently pulling the cover from the assembly while using a screwdriver to release the locking tabs, as shown in Figure 040-4. Figure 040-4: Housing Base Caution! Do NOT pry the bottom cover off. It can be easily removed using the procedure outlined above. 5. Remove the two T20 screws (Figure 040-5, Item 1). 6. Remove the temperature regulator and temperature limiter. 7. Disconnect all temperature regulator and temperature limiter connections. 34

Figure 040-5: Steam Generator Temperature Regulator and Temperature Limiter 4.4 Removing the Steam Duct and Seal 1. Open the door. 2. Remove the steam generator. 3. Remove the insert from the steam generator housing. 4. Remove the bottom cover from the housing by gently pulling the cover from the assembly while using a screwdriver to release the locking tabs, as shown in Figure 040-4. 5. Remove the two steam duct retaining screws (T10s). See Figure 040-6, Item 1. Note: When re-installing the seal, make sure that the notch is positioned as shown in Figure 040-6, Item 2. Figure 040-6: Steam Duct Retaining Screws 6. Remove the steam duct and seal. 35

4.5 Accessing the Tank Float/Float Switch Actuating Magnet (DG 4080 Only) 1. Open the door. 2. Remove steam generator. 3. Remove the insert from steam generator housing. 4. Remove the top cover retaining screw (Figure 040-7, Item 1). 5. Slide the top cover off to remove it from the steam duct assembly. Note: The two spring clips (Figure 040-7, Item 2) will release from the top cover during removal. They will need to be re-installed into the cover prior to reassembly. 6. Slide the float assembly upward from the track to remove. 7. Slide the new float into the track. Ensure that the float can move freely through the track. Reassembly: 1. Hold the top cover upside down. 2. Install and hold the top cover spring clips in position and slide the steam duct assembly into the cover. 3. Reposition the steam duct assembly and slide it into the cover track. 4. Re-install the retaining screw (Figure 040-7, Item 1). Figure 040-7: Removing the Top Cover from the Steam Duct Assembly 4.6 Removing the Reed Contact Float (PCB) (S12) 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the right side panel. See Section 010-4.2. 4. Disconnect the connection from the float PCB (Figure 040-8, Item 1). 5. Remove the PCB with a pair of pliers. 36

Figure 040-8: Reed Contact Float 4.7 Removing the Steam Generator Present Switch (S84) 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the right side panel. See Section 010-4.2. 4. Pull the retaining tabs back to access the switch (Figure 040-9, Item 1) and slide the switch out. 5. Disconnect all switch connections. Figure 040-9: Steam Generator Present Switch 4.8 Removing the Steam Generator Socket 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the right side panel. See Section 010-4.2. 4. Remove the retaining plate from the socket. 5. Release the socket tabs. 6. Remove the socket via the rear of the appliance. 37

060 Fascia, Electronics DG 4080 DG 4082 38

2 Function 2.1 Optical Interface The appliance has an optical interface to support diagnosis. See Figure 060-1, Item 1. The interface can be located with the Find Optical Interface function of the Miele diagnostic support (MDU). Figure 060-1 Optical Interface 39

2.2 Electronics Overview 2.2.1 Main Electronic Figure 060-2: EPL700 Electronic Overview (DG 4080 Shown) 40

2.2.2 AC Power Electrical Circuit Figure 060-3: AC Power Electrical Circuit (DG 4080) 2.3 Warming Function If the appliance is not switched off after a cooking process, foods can be kept warm at 158 F for a maximum of 15 minutes. In this case the display shows Warming. This function can be set in customer programming. Warming is cancelled automatically when the door is opened. The factory setting is Off for DG 4080 and On for DG 4082. 2.4 Power Management Starting with ID795, the electronic is equipped with a power management feature. If this feature is enabled, the oven floor heater will not be activated during the heating-up phase and only one steam generator element will be used during operation. The factory setting is Off. 2.5 Descaling Descaling agent is added to the water (see the operating manual for instructions). 1-minute exposure phase: In this phase the process can still be aborted without subsequent forced descaling. 41

11-minute descaling phase: The un-calibrated appliance is heated to 194 F (90 C); the calibrated appliance, 203 F (95 C). Rinse and refill with fresh water. 10-minute calibration phase: The boiling temperature is adjusted for the altitude of the location. See the operating manual for the descale procedure. 3 Fault Repair 3.1 Fault Code Summary Fault Code Description of Fault Cause and Remedy F05 Short circuit in PT 1000 temperature sensor See Section 060-3.2. F06 Open circuit in PT 1000 temperature sensor See Section 060-3.3. F20 Heating fault See Section 060-3.4. F44 (newer DG 4080s, Faulty control electronic/ DG 4082) power electronic interface See Section 060-3.5. Table 060-1: Fault Codes 3.2 F05 - Short Circuit in PT 1000 Temperature Sensor PT 1000 temperature sensor (R30) or connector short-circuited. Replace the temperature sensor. See Section 030-4.1. 3.3 F06 - Open Circuit in PT 1000 Temperature Sensor PT 1000 temperature sensor (R30) or connector open-circuited. Replace the temperature sensor. See Section 030-4.1. Electronic not plugged in or poor plug contact. 1. Check plug for correct position and contact. 2. Insert plug properly. 3. If plug is defective, replace the temperature sensor. See Section 030-4.1.. 3.4 F20 - Heating Fault Symptom: Fault code F20 shows up if no temperature increase is registered within 5 minutes. If the appliance is in a preheated state, this time is reduced to 3 minutes. After a new start, fault code F20 no longer shows up. It only appears again if a new fault occurs. 42

Steam generator not seated correctly or seal not sufficiently lubricated. Lubricate the seal with silicone grease (part no. 05132001). Slide the steam generator in properly, over the guides in the floor of the housing. Steam generator heater (1R25, 2R25) defective. Test the steam generator in service mode; refer to Section 060-4.2. Note: The heater elements are integrated into the housing of the steam generator and cannot be replaced separately. Replace the entire steam generator assembly if either of these heater elements is defective. Temperature sensor does not register the increase in temperature. Check if the temperature sensor is seated in its seal. Re-fit it, if necessary. Water being used is extremely cold. Use water at room temperature. Heavy mineral deposits. Descale appliance. See the operating instructions. Float for monitoring water level is jammed. Safety cutoff after 38 minutes straight heating time. Check float and guide at the insulated part of the steam generator. Replace float or steam generator insulation, if necessary. Problems with the contact of the steam generator socket. Replace the steam generator and its 3-pin socket; see Section 040-4.7. Software fault. At an altitude higher than 2183 feet (2000 meters) above sea level, the descaling process is aborted. F20 appears in the display. Since production index 41/..., a UBS altitude adjustment package (mat. no. 08349700) has been used. The UBS contains the electronics mat. nos. 06054305 and 06427543. After installing this UBS, the oven will have the preheat function. 43

3.5 F44 - Control Electronic/Power Electronic Interface is Faulty Symptom: Faulty communication between control electronic and power electronic. Defective connectors or plugs between the electronics. Check connectors and plugs. Replace as necessary. Defective control electronic. Replace the control electronic. See Section 060-4.4. Defective power electronic. Replace the power electronic. 3.6 Displays Look Different Symptom: The displays of different appliances with Navitronic controls (H 4000, H 4000 BM, DG 4000) have a different appearance. Different angles of view (units next to each other, or one above the other), different light reflection. Use the Brightness and Contrast functions to adjust the displays; see Section 060-4.1. 3.7 Wrong Language Setting Several languages are available. Use the language icon as a guide to set the desired language. 3.8 Display Dims The time of day indication can be programmed. See Section 060-4.1. 3.9 Time of Day Shown in 12-Hour Format/24-Hour Format The time format can be programmed. See Section 060-4.1. 44

3.10 Cooking Program Does Not Start Start is set to manual. Start can be set as manual or automatic. If start was set to manual, then the start of a cooking cycle has to be confirmed manually. Set start to automatic ; refer to Section 060-4.1. 3.11 Excessive Steam in the Oven Cavity Steam reduction has been shut off. Turn on steam reduction; refer to Section 060-4.1. 3.12 Cooked Food Is Not Kept Warm Warming function has been shut off. Turn on the warming function; refer to Section 060-4.1. Steam reduction has been shut off. Warming is not possible while steam reduction is shut off. Turn on steam reduction; refer to Section 060-4.1. Check if warming is turned on; see Section 060-4.1. 3.13 Recommended Temperatures Are Changed Recommended temperatures can be programmed. See Section 060-4.1. 3.14 Display Is Hard To Read Display brightness and contrast can be set. See Section 060-4.1. 3.15 Buzzer at the End of a Cooking Cycle is Too Loud/Soft/Short The melody, volume and duration of the buzzer tone can be set. See Section 060-4.1. 45

3.16 When Touching a Keypad, Tone is Too Loud or Too Soft DG 408x Steam Ovens Keypad volume can be programmed. The keypad tone can also be turned on or off. See Section 060-4.1. 3.17 System Lock Is Possible/Not Possible Symptom: The lock icon is not present in the display. To accept or not to accept the system lock can be programmed. See Section 060-4.1. 3.18 Temperature in C / F The temperature format can be programmed. See Section 060-4.1. 4 Service 4.1 Programming Mode Initial requirements: Shut off the appliance. Accessing: Note: Access has to be completed with 10 seconds. 1. Touch and hold the Timer pad for DG 4082, or the Clear pad for DG 4080. 2. Touch and hold the On pad. 3. Release the Timer (Clear) and On pads at the same time. 4. Touch the Timer (Clear) pad five times and hold on the fifth time until the programming mode appears. Acknowledgement indicator: The display shows the programming options. LANGUAGE CLOCK TEMPERATURES TEMPERATURE WATER HARDNESS More Options: Touch the pad next to the desired option (refer to Table 060-2). Press Timer (Clear) to go back one level. Touch the pad next to the desired setting (refer to Table 060-2). Press Timer (Clear) to go back one level. 46

Option Available Settings Factory Setting LANGUAGE 1 deutsch If the language setting is english english espanol francais italiano polski português incorrect, follow the icon to locate the language menu. CLOCK 1 The time of day can be entered using the numeric keypad. -- Size Normal Normal Large 12-hour clock The time of day is shown 12-hour format 24-hour clock in 12-hour format. The time of day is shown in 24-hour format. Clock display On The time of day will be shown in the display when the appliance is shut off. Off When the appliance is shut off, the display remains dark. RECOMMENDED CUSTOM 105 F - 212 F 212 F TEMP. or CANNING 175 F - 212 F 212 F TEMPERATURES 1 REHEAT 175 F - 212 F 212 F DEFROST 125 F - 140 F 140 F TEMPERATURE 1 F F WATER HARDNESS 1 (DG 4080 only) WATER HARDNESS 1 (DG 4082 only) C Level 1 (# - # ppm) Level 2 (# - # ppm) Level 3 (# - # ppm) Level 4 (# - # ppm) Touch pad next to Softer or Harder until the desired level is indicated. On Level 4 Level 4 Level 8 Level 8 Level 12 Level 16 STEAM REDUCTION 1 On Shortly before the cooking time is up, the release element opens the door a crack to reduce steam in the oven cavity; see Section 010-2.4. Off Steam reduction is shut off. When steam reduction is shut off, the warming option cannot be used. On 47

Option Available Settings Factory Setting WARMING FUNCTION 1 On If the appliance is not shut off after a cooking Off for DG 4080; on for DG 4082 process, foods can be kept warm at 158 F for a maximum of 15 minutes. In this case the display reads, Warming. Off The warming function is BUZZER or TONE OPTIONS 1 Minute Minder/Timer 1 Tone Minute Minder/Timer 2 shut off. 1-5 1 1-5 1 Tone Keypad Tone On When a pad is touched, a tone is emitted. Off When a pad is touched, no tone is emitted. Volume 1-5 5 Tone Short The buzzer sounds three times. Long The buzzer sounds for 1 hour. DISPLAY 1 Brightness 1-5 4 START Automatic start The cooking cycle starts SETTINGS 1 On Short Contrast 1-5 4 Automatic start automatically. Manual start The cooking cycle has to be confirmed manually. SYSTEM LOCK 1 Accept The appliance can be safeguarded against accidental operation. Do not accept The appliance cannot be safeguarded against accidental operation. RESET 1 TEMPERATURES Only the recommended temperatures revert to factory settings. RESET ALL SETTINGS (DG 4082 only) All settings made by the customer revert to factory settings, except for favorites and the fault memory. FAVORITES All favorites are deleted. All settings made by the customer are reset to factory settings when Yes is pressed. Favorites are erased. The fault memory remains. Do not accept -- -- 48

Option Available Settings Factory Setting RESTART or NEW A restart is like a power disconnection. All -- START settings made by the customer, as well as favorites and the fault memory, remain. RESET DESCALING or DESCALE - CLEAR 2 The descaling lock is cleared. Warning! After service is completed, the appliance has to be descaled. -- Table 060-2: Programming Mode 1 These settings can also be changed in customer programming. 2 Descaling is only visible when the descaling lock is active. In order to activate the descaling lock, start the descaling process, let it run for more than one minute and then interrupt the program. Back (without saving): Touch the Timer (Clear) pad. Save and back: Touch the pad next to OK. Quit: Touch the Off pad. 4.2 Service Mode Initial requirements: Shut off the appliance. Accessing: Note: Access must be completed with 10 seconds. 1. Touch and hold the Timer pad for DG 4082, or the Clear pad for DG 4080. 2. Touch and hold the On pad. 3. Release the Timer (Clear) and On pads at the same time. 4. Touch the Timer (Clear) pad three times and hold on the third time until the service mode appears. Acknowledgement indicator: The display shows the service options. INDEX FAULT INDEX FUNCTION TEST SENSOR TEST RUNNING TIME More Options: Touch the pad next to the desired option (see Table 060-3). Press Timer (Clear) to go back one level. Touch the pad next to the desired setting (see Table 060-3). Press Timer (Clear) to go back one level. 49

Option Setting/Activation Description INDEX CONTROL ELECTRONIC e.g., EPX 702 ID33795 V.2 The ID number of the control electronic (2N1) is indicated. POWER ELECTRONIC e.g., EPL 700 ID00796 The ID number of the power electronic (3N1) is indicated. FAULT INDEX No Faults or fault code, e.g., F 01 All faults registered so far are indicated; refer to Table 060-1. Delete faults All saved faults are deleted. FUNCTION TEST ALL OFF All components are switched off. HEATING CIRCUIT 1/ STEAM GENERATOR On Steam generator heater (1R25) is switched on. (1R25) Off Steam generator heater (1R25) is switched off. HEATING CIRCUIT 2/ STEAM GENERATOR On Steam generator heater (2R25) is switched on. (2R25) Off Steam generator heater (2R25) is switched off. LOWER HEAT ELEM. On Floor heater R28 is switched on. or FLOOR HEATER Off Floor heater R28 is switched off. FAN (M2) On The fan (M2) is switched on. Off The fan (M2) is switched off. DOOR OPENER (Y56) On The release element (Y56) is activated and controls the door opener via a metal rod, which opens the door a crack. Off The door closes again slowly. BUZZER On The buzzer sounds. Off The buzzer goes silent. DISPLAY The display alternately lights up and goes dark. SENSOR TEST STEAM GENERATOR CONTACT or STEAM GENERATOR Closed Steam generator is inserted. The steam generator switch (S84) is switched on. CONTROL Open Steam generator is not inserted. LEVEL INDICATOR or FILL INDICATOR Closed The steam generator is filled. The level switch (S12) is switched on. Open The steam generator is not filled. DOOR SWITCH Closed Door is closed. Door contact switch (S4) is switched on. Open The door is open. TEMP INTERIOR e.g., 81 F The temperature at the PT 1000 temperature sensor (R30) is indicated. (F06 if open circuited.) KEYPAD or FUNCTION PAD PANEL All keypads, with the exception of Timer and Off (DG 4082) or Clear and Off (DG 4080), can be checked by touch. RUNNING TIME HEATING CIRCUIT 1 e.g., 0008h The operating hours of heater 1R25 are indicated. HEATING CIRCUIT 2 e.g., 0008h The operating hours of heater 2R25 are indicated. LOWER HEAT ELEM. or FLOOR HEATER DESCALE or NO. OF DESCALES Table 060-3: Service Mode e.g., 0005h e.g., 1 The operating hours of heater R28 are indicated. The number of descales performed is indicated. 50

Back: Touch the Timer (Clear) pad. Save: Touch the Off pad. 4.3 Removing the Fascia Panel Assembly 4.3.1 DG 4080 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove both side covers. See Section 010-4.2. 4. Remove screws of fascia panel (Figure 060-4, Item 1, left and right). 5. Disconnect wiring and ground lead. 6. Take off fascia panel with support plate. 7. Remove screws from support plate (Figure 060-4, Items 2 and 3). 8. Separate fascia panel from support plate. Figure 060-4: Fascia Panel Assembly (DG 4080) 9. Disconnect connections from the control and display electronics. 10. Remove screws (Figure 060-5, Item 1). 11. Take off the control electronic. 51

Figure 060-5: Control Electronic Screws (DG 4080) Note: The fascia panel is firmly attached to the display electronic and can only be replaced together as an assembly. 4.3.2 DG 4082 1. Take the steam generator and equipment out of the oven cavity. 2. Uninstall the appliance. See Section 010-4.1. 3. Remove the four T20 screws securing the fascia panel (Figure 060-6, Item 1, left and right). 4. Loosen the four T20 screws securing the control electronic mounting bracket to the fascia panel (see arrows, Figure 060-6, left and right). 5. Remove the fascia panel partway (Figure 060-6, Item 2). Figure 060-6: Fascia Panel (DG 4082) 52

6. Disconnect the ribbon cable connecting the selection electronic to the control electronic. 7. Take off the fascia panel. Note: The fascia panel is firmly attached to the selection electronic and can only be replaced as a complete assembly. 4.4 Removing the Control Electronic (DG 4082) 1. Uninstall the appliance. See Section 010-4.1. 2. Remove the fascia panel. See Section 060-4.4. 3. Disconnect all control electronic connections (two wiring harnesses and one ground wire). 4. Unclip and remove the control electronic from its mounting bracket. See Figure 060-7. Figure 060-7: Removing the Control Electronic (DG 4082) 4.5 Removing the Selection Electronic Note: The fascia panel is firmly attached to the selection electronic and can only be replaced as a complete assembly. 1. Remove the fascia panel. See Section 060-4.3. 2. Install a new fascia panel/selection electronic assembly. 53

070 Technical Service Bulletins 1 DG 4080 Steam Oven Displays F20 in a New Installation When a DG 4080 displays F20 (heating fault), there are several possible causes outlined in the service documentation. If you should encounter a new steam oven with persistent F20 problems, please ascertain that the unit is properly connected to 240 volts. If the steam oven is connected to 120 volts, the electronic will still operate and show a display, but the steam generator will never properly heat up. The absolute confirmation for this problem is to remove the unit and measure the voltage at the outlet. Position Setting / Activation Description / Result PROGRAM INDEX FAULT MEMORY FUNCTION TEST FUNCTION TEST FUNCTION TEST FUNCTION TEST FUNCTION TEST CONTROL ELECTRONIC OUTPUT ELECTRONIC e. g. Fault 01 Delete faults HEATING CIRCUIT 1 HEATING CIRCUIT 2 FLOOR HEATER FAN (M2) DOOR OPENER (Y56) e.g. EPX 702 ID33795 V.2 e. g. EPL 700 ID00796 On Off On Off On Off On Off On Off The ID number of the Control Electronic (2N1) is indicated. The ID number of the Output Electronic (3N1) is indicated. All faults registered so far are indicated. All saved faults are deleted. The steam generator heater (1R25) is switched on. The steam generator heater (1R25) is switched off. The steam generator heater (2R25) is switched on. The steam generator heater (2R25) is switched off. The floor heater element (R28) is switched on. The floor heater element (R28) is switched off. The fan motor (M2) is switched on. The fan motor (M2) is switched off. The release element (Y56) is activated and controls the door opener via a metal rod, which opens the door a crack. The door closes again slowly. FUNCTION BUZZER On The buzzer sounds. 54