SERVICE INSTRUCTION R410A. WALL MOUNTEDtype INVERTER SPLIT TYPE ROOM AIR CONDITIONER. Models Indoor unit Outdoor unit AO*G24LFL AO*G24LFCC AO*G30LFT

Transcription

1 SERVICE INSTRUCTION SPLIT TYPE ROOM AIR CONDITIONER WALL MOUNTEDtype INVERTER Models Indoor unit Outdoor unit AS*G4LFCA AS*G4LFCC AS*G0LFCA AO*G4LFL AO*G4LFCC AO*G0LFT R40A

2 CONTENTS. DESCRIPTION OF EACH CONTROL OPERATION. COOLING OPERATION HEATING OPERATION DRY OPERATION AUTO CHANGEOVER OPERATION INDOOR FAN CONTROL OUTDOOR FAN CONTROL LOUVER CONTROL COMPRESSOR CONTROL TIMER OPERATION CONTROL ELECTRONIC EXPANSION VALVE CONTROL TEST OPERATION CONTROL PREVENT TO RESTART FOR MINUTES ( MINUTES ST) FOUR-WAY VALVE EXTENSION SELECT AUTO RESTART MANUAL AUTO OPERATION (Indoor unit body operation) FORCED COOLING OPERATION COMPRESSOR PREHEATING C HEAT OPERATION ECONOMY OPERATION DEFROST OPERATION CONTROL OFF DEFROST OPERATION CONTROL VARIOUS PROTECTIONS COMPRESSOR STOP CONTROL TROUBLE SHOOTING - ERROR DISPLAY INDOOR UNIT AND WIRED RMOTE CONTROLLER DISPLAY (OPTION) WIRED REMOTE CONTROLLER DISPLAY (OPTION) TROUBLE SHOOTING WITH ERROR CODE TROUBLE SHOOTING WITH NO ERROR CODE SERVICE PARTS INFORMATION APPENDING DATA - FUNCTION SETTING INDOOR UNIT Procedures to change the Function Setting for wireless RC Outdoor unit Pressure Value and Total Electric Current Curve Resistance Values

3

4 R40A WALL MOUNTED type INVERTER. DESCRIPTION OF EACH CONTROL OPERATION

5 . COOLING OPERATION - COOLING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. * If the room temperature is C higher than a set temperature, the compressor operation frequency will attain to maximum performance. * If the room temperature is some degrees lower than a set temperature, the compressor will be stopped. * When the room temperature is between + C to -.5 C of the setting temperature, the compressor frequency is controlled within the range shown in Table. However, the maximum frequency is limited in the range shown in Fig. based on the fan speed mode and the outdoor temperature. ( Table : Compressor Frequency Range ) minimum frequency maximum frequency maximum frequency AO*G4LFL 5rps 88rps 95rps AO*G4LFCC rps 80rps rps AO*G0LFT 6rps 5rps 7rps When the compressor operates for 0 minutes continuously at over the maximum frequency, the maximum frequency is changed from Maximum Frequency to Maximum Frequency. ( Fig. : Limit of Maximum Frequency based on Outdoor Temperature ) Outside air temperature Outside air temperature 4 C 0 C 9 C 0 C 0 C A zone B zone C zone D zone E zone F zone 6 C C C C C 4LFL 4LFCC 0LFT Hi Me Lo Quiet A zone 95rps 74rps 6rps 8rps B zone 95rps 74rps 6rps 8rps C zone 95rps 74rps 6rps 8rps D zone 68rps 5rps 4rps 6rps E zone 68rps 5rps 4rps 6rps F zone 68rps 5rps 4rps 6rps A zone rps 67rps 56rps 4rps B zone rps 67rps 56rps 4rps C zone rps 67rps 56rps 4rps D zone 6rps 47rps 40rps 5rps E zone 6rps 47rps 40rps 5rps F zone 6rps 47rps 40rps 5rps A zone 7rps 49rps 4rps 9rps B zone 7rps 49rps 4rps 9rps C zone 55rps 4rps 6rps 9rps D zone 4rps 6rps rps 0rps E zone 4rps 6rps rps 0rps F zone 4rps 6rps rps 0rps 0-0

6 . HEATING OPERATION - HEATING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit body will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. * If the room temperature is lower by C than a set temperature, the compressor operation frequency will attain to maximum performance. * If the room temperature is some degrees higher than a set temperature, the compressor will be stopped. * When the room temperature is between +.5 C to - C of the setting temperature, the compressor frequency is controlled within the range shown in Table. ( Table : Compressor Frequency Range ) minimum frequency maximum frequency AO*G4LFL 6rps rps AO*G4LFCC 4rps 0rps AO*G0LFT 6rps 90rps. DRY OPERATION - INDOOR UNIT CONTROL The compressor rotation frequency shall change according to the temperature, set temperature, and room temperature variation which the room temperature sensor of the indoor unit body has detected as shown in the Table. However, after the compressor is driven, the indoor unit shall run at operation frequency of 68rps (4L), 4rps (0L), for a minute. ( Table : Compressor frequency ) Operating frequency Operating frequency Operating frequency 4LFL X zone J zone Y zone 8rps 8rps 0rps 4LFCC X zone J zone Y zone 4rps 6rps 0rps 0LFT X zone J zone Y zone 9rps 6rps 0rps ( Fig. : Compressor Control based on Room Temperature ) Room temperature Room temperature Ts+0.5 C Ts -.5 C X zone J zone Y zone Ts+.5 C Ts -0.5 C 0-0

7 4. AUTO CHANGEOVER OPERATION When the air conditioner is set to the AUTO mode by remote control, operation starts in the optimum mode from among the HEATING, COOLING, DRY and MONITORING modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 8 C and 0 C in C steps. Operation flow chart START Room temp. >Ts+ C? NO YES TS : Setting temperature NO Room temp. <Ts- C? YES HEATING OPERATION COOLING OPERATION YES Thermostat remains in OFF state for 6 minutes or longer? Thermostat remains in OFF state for 6 minutes or longer? YES NO NO YES System stops or operation command other than auto changeover operation? System stops or operation command other than auto changeover operation? YES NO NO 0-0

8 5. INDOOR FAN CONTROL. Fan speed ( Table4 : Indoor Fan Speed ) Operation mode Heating Cooling/ Fan Dry Air flow mode Hi Me+ Me Lo Quiet Cool air prevention S-Lo Hi Me Lo Quiet Speed (rpm) AS*G4LFCA(LFCC) AS*G0LFCA (480) (480) X zone: 860 X zone: 900 J zone: 780 J zone: 780. FAN OPERATION The airflow can be switched in 5 steps such as AUTO, QUIET, LOW, MED, HIGH, while the indoor fan only runs. When Fan mode is set at [AUTO], it operates on [MED] Fan Speed.. COOLING OPERATION Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Fig.. On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow of [COOL] operation modes QUIET, LOW, MED, HIGH, as shown in Table5. ( Fig. : Airflow change - over ( Cooling : AUTO ) ) TR-Ts > C C > TR-Ts > C = C > TR-Ts When the room temperature drops HIGH mode MED mode LOW mode TR-Ts >.5 C =.5 C > TR-Ts >.5 C =.5 C > TR-Ts When the room temperature rises TR : Room temperature Ts : Setting temperature 4. DRY OPERATION Refer to the Table4. During the dry mode operation, the fan speed setting can not be changed. 0-04

9 5. HEATING OPERATION Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Fig.4. On the other hand, if switched in [HIGH] [QUIET], the indoor motor will run at a constant airflow of [HEAT] operation modes QUIET, LOW, MED, HIGH, as shown in Table5. ( Fig.4 : Airflow change - over ( Heating : AUTO ) ) TR-Ts > - C = - C > TR-Ts > - C = When the room temperature rises LOW mode MED mode When the room temperature drops TR-Ts > -.5 C = -.5 C > TR-Ts > -.5 C = - C > TR-Ts MED+ mode -.5 C > TR-Ts TR : Room temperature Ts : Setting temperature 6. COOL AIR PREVENTION CONTROL (Heating mode) The maximum value of the indoor fan speed is set as shown in Fig.5, based on the detected temperature by the indoor heat exchanger sensor on heating mode. ( Fig.5 : Cool Air Prevention Control ) Indoor heat exchanger temperature 4 C 9 C 7 C 0 C Hi Me+ Lo Cool air prevention S-Lo Indoor heat exchanger temperature 7 C 4 C C 8 C 7. MOISTURE RETURN PREVENTION CONTROL (Cooling mode& Dry mode) Switch the airflow [AUTO] at cooling mode, and the indoor fan motor will run as shown in Fig INDOOR UNIT FAN CONTROL FOR ENEGY SAVING (Cooling mode) Switch the airflow at cooling mode, and the indoor fan motor will run as shown in Fig.6. It depends on the function setting "Indoor unit fancontrol for energy saving" ( Fig.6 : Indoor Fan Control ) Compressor ON OFF Indoor fan Setting air flow Indoor fan (as shown in Table 5) S-Lo OFF ( Table5 : Indoor fan speed ) (SEC) Dry X zone J zone Y zone Cooling AS*G4LFCA / LFCC 860rpm 780rpm 0 70rpm ( 4LFCC: 480rpm) 860rpm AS*G0LFCA 900rpm 780rpm 0 70rpm 900rpm 0-05

10 6. OUTDOOR FAN CONTROL. Outdoor Fan Motor Following table shows the type of the outdoor fan motor. The control method is different between AC motor and DC motor. ( Table6 : Type of Motor ) AO*G4LFL / LFCC / 0LFT AC Motor DC Motor. Fan Speed ( Table7 : Outdoor fan speed ) Zone Cooling Heating D 050/ 80/ 70/ 500 F 40/ 50/ 00 AO*G4LFL 00/ 80/ 70/ 550/ 450 G 50/ 90/ 60 H 80/ 50/ 0 D 00/ 870/ 70/ 500 F 40/ 70/ 00 AO*G4LFCC 00/ 050/ 780/ 70/ 590/ 480 G 50/ 00 /60 H 50/ 00 D 850/ 800/ 60/ 500/ 400 F 500/ 0/ 50 AO*G0LFT 900/ 850/ 800/ 60/ 550/ 450 G 00/ 0 /00 H 0/ 00 Refer to Fig.7 (rpm) Dry / 450 ( Fig.7 : Outside air temperature zone selection ) Outside air temperature C C - 8 C D zone F zone G zone H zone (AS*G4L is nonaction) Outside air temperature 0 C 0 C - 0 C * The outdoor fan speed mentioned above depends on the compressor frequency. (When the compressor frequency increases, the outdoor fan speed also changes to the higher speed. When the compressor frequency decreases, the outdoor fan speed also changes to the lower speed.) * After the defrost control is operated on the heating mode, the fan speed keeps at the higher speed as table8 without relating to the compressor frequency. ( Table8 : Outdoor fan speed after the defrost ) AO*G4LFL / LFCC AO*G0LFT 00rpm 900rpm 0-06

11 7. LOUVER CONTROL. VERTICAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follow: Types of Airflow Direction Setting:,,,,, : During Heating/ Cooling/ Dry modes The Remote Controller's display does not change Use the air direction adjustments within the ranges shown above. The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected. During Cooling / Dry mode : Horizontal flow During Heating mode : Downward flow During AUTO mode operation, for the first a few minutes after beginning operation, airflow will be horizontal ; the air direction cannot be adjusted during this period. Direction Only the direction of the Airflow Direction Louver changes; the direction of the Power Diffuser does not change. The airflow direction setting will temporarily become when the temperature of the airflow is low at the start of the Heating mode. After beginning of AUTO/HEAT mode operated and automatic defrosting operation time, the air flow will be horizontal. However, the Airflow Direction cannot be adjusted at beginning AUTO operation mode.. HORIZONTAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follows. Cooling / Heating / Dry mode / Fan mode 4 5 The Remote Controller's display does not change.. SWING OPERATION To select Vertical Airflow Swing Operation When the swing signal is received from the remote controller, the vertical louver starts to swing. (Swinging Range) Cooling mode / Dry mode / Fan mode( ) : 4 Heating mode / Fan mode( 4 6 ) : 6 When the indoor fan is S-Lo or Stop mode, the swing operation is interrupted and it stops at either upper end or bottom end. To select Horizontal Airflow Swing Operation When the swing signal is received from the remote controller, the horizontal louver starts to swing. (Swinging Range) All mode : 5 When the indoor fan is S-Lo or Stop mode, the swing operation is interrupted and it stops at either upper end or bottom end. To select Vertical and Horizontal Airflow Swing Operation When the horizontal swing signal is input from remote control, the combination of the vertical and horizontal swing operation is performed. 0-07

12 8. COMPRESSOR CONTROL. OPEARTION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in the table9. (Table 9 : Compressor Operation Frequency Range) Cooling Heating Min Max Min Max Min Max Dry AO*G4LFL 5rps 95rps 6rps rps 8rps 8rps AO*G4 LFCC rps rps 4rps 0rps 6rps 4rps AO*G0LFT 6ps 7rps 6rps 90rps 6rps 9rps. OPEARTION FREQUENCY CONTROL AT NORMAL START UP The compressor frequency soon after the start-up is controlled as shown in the Fig.8. (Fig.8 : Compressor Control at Start-up) Frequency Frequency Frequency Frequency Frequency Time Time Time Time Time (Frequency) Frequency Frequency Frequency Frequency Frequency AO*G4LFL 40rps 60rps 75rps 9rps 0rps AO*G4LFCC 5rps 5rps 66rps 8rps 06rps AO*G0LFT 0rps 47rps 60rps (Time) Time Time Time Time Time AO*G4LFL 70sec 80sec 0sec 500sec 550sec AO*G4 LFCC 80sec 60sec 00sec 400sec 500sec AO*G0LFT 60sec 0sec 80sec 0-08

13 9. TIMER OPEARTION CONTROL 9- WIRELESS REMOTE CONTROLLER The table0 shows the available timer setting based on the product model. ( Table 0 : Timer Setting ) ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER AS*G4 / LFCC / 0LFCA. OPEARTION FREQUENCY RANGE OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer ON timer : When the clock reaches the set time, the air conditioner will be turned on. Stop mode Operation mode Set time of timer. PROGRAM TIMER The program timer allows the OFF timer and ON timer to be used in combination one time. Operation mode Operation mode Operation mode Stop mode Stop mode Stop mode Set time Set time Set time Set time Operation will start from the timer setting (either OFF timer or ON timer) whichever is closest to the clock's current timer setting. The order of operations is indicated by the arrow in the remote control unit's display. SLEEP timer operation cannot be combined with ON timer operation. 0-09

14 . SLEEP TIMER If the sleep is set, the room temperature is monitored and the operation is stopped automatically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time ON. In the cooling operation mode When the sleep timer is set, the setting temperature is increased C. It increases the setting temperature another C after hour. After that, the setting temperature is not changed and the operation is stopped at the time of timer setting. Set temperature rises ( Ts : Set temperature ) + C + C Ts Stop of operation Set 60min In the heating operation mode When the sleep timer is set, the setting temperature is decreased C. It decreases the setting temperature another C every 0 minutes. Upon lowering 4 C, the setting temperature is not changed and the operation stops at the time of timer setting. Set temperature lowers ( Ts : Set temperature ) Ts - C - C - C -4 C Stop of operation Set 0min 0min 0min 0-0

15 9- WIRED REMOTE CONTROLLER (OPTION) The table shows the available timer setting based on the product model. ( Table : Timer Setting ) ON TIMER / OFF TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER AS*G4 / LFCC / 0LFCA. ON TIMER / OFF TIMER Same to 8-.ON TIMER / OFF TIMER and shown in those.. WEEKLY TIMER This timer function can set operation times of the each day of the week. All days can be set together,the weekly timer can be used to repeat the timer setting for all of the days. ON OFF ON OFF ON OFF Setting day Setting day Setting day Set time Set time. TEMPERATURE SET BACK TIMER This timer function can change setting temperature of setting operation times of the each day of the week. This can be together with other timer setting. Set back tmp. ON OFF Normal tmp. Set time Set time 0-

16 0. ELECTRONIC EXPANSION VALVE CONTROL The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the Table. The compressor frequency, the temperatures detected by the discharge temperature sensor, the indoor heat exchanger sensor, the outdoor heat exchanger sensor, and the outdoor temperature sensor. ( Table : The pulse range of the electronic expansion valve control ) AO*G4LFL / LFCC AO*G0LFT Operation mode Cooling / Dry mode Heating mode Cooling / Dry mode Heating mode Pulse range between 60 to 480 pulses. between 60 to 480 pulses. between 5 to 480 pulses. between 40 to 480 pulses. The expansion valve is set at 480 pulses after 0seconds(4L), 0seconds(0L), of stopping compressor. At the time of supplying the power to the outdoor unit, the initialization of the electronic expansion valve is operated (58 pulses are input to the closing direction).. TEST OPERATION CONTROL [ Wireless remote controller ] Under the condition where the air conditioner runs, press the test run button of the remote control, and the test operation control mode will appear. During test running, the operation lamp and timer lamp of the air conditioner body twinkle simultaneously. [ Wired remote controller (Option) ] If the operation lamp is on, press the Start/Stop button to turn it off. Press the Master Control and Fan Control buttons at the same time for more than two seconds to start the test operation. The operation lamp will light up and "o" will be displayed on the set temperature display. [ Release ] Perform the test operation for 60 minutes. Pressing the Start/Stop button will stop the test operation.. PREVENT TO RESTART FOR MINUTES ( MINUTES ST ) The compressor won't enter operation status for minutes after the compressor is stopped, even if any operation is given.. FOUR-WAY VALVE EXTENSION SELECT At the time when the air conditioner is switched from the cooling mode to heating mode, the compressor is stopped, and the four-way valve is switched in minutes later after the compressor stopped. 0-

17 4. AUTO RESTART When the power was interrupted by a power failure, etc. during operation, the operation contents at that time are memorized and when power is recovered, operation is automatically started with the memorized operation contents. When the power is interrupted and recovered during timer operation, since the timer operation time is shifted by the time the power was interrupted, an alarm is given by blinking (7 sec ON/ sec OFF) the indoor unit body timer lamp. [ Operation contents memorized when the power is interrupted ] Operation mode Set temperature Set air flow Timer mode and timer time Set air flow Direction Swing ECONOMY operation 0 C HEAT operation 5. MANUAL AUTO OPERATION (Indoor unit body operation) If MANUAL AUTO Button is set, the operation is controlled as shown in Table. If the remote control is lost or battery power dissipated, this function will work without the remote control. (Table) Manual auto operation OPERATION MODE Auto changeover FAN CONT. MODE Auto TIMER MODE Continuous (No timer setting available) SETTING TEMP. 4 C SETTING LOUVER Standard SWING OFF 6. FORCED COOLING OPERATION If cooling operation is set, the operation is controlled as shown in Table4. ( Table4 ) OPERATION MODE FAN CONT. MODE TIMER MODE SETTING TEMP. SETTING LOUVER SWING Forced cooling operation Cooling Hi - Room Temp is not controlled Initial : Horizontal (It is changed follow as setting of remote controller) OFF Forced cooling operation is started when pressing MANUAL AUTO button for 0 seconds or more. During the forced cooling operation, it operates regardless of room temperature sensor. Operation LED and timer LED blink during the forced cooling operation. They blink for second ON and second OFF on both operation LED and timer LED (same as test operation). Forced cooling operation is released after 60 minutes of starting operation. The FORCED COOLING OPERATION will start as shown in Table4. 0-

18 7. COMPRESSOR PREHEATING When the outdoor heat exchanger temperature is lower than 0 C and the heating operation has been stopped for 0 minutes, power is applied to the compressor and the compressor is heated. (By heating the compressor, warm air is quickly discharged when operation is started.) When operation was started and when the outdoor heat exchanger temperature rises to C or greater, preheating is ended. ( Fig.9 : Compressor Preheating ) OFF C 0 C ON 8. 0 C HEAT OPERATION The 0 C HEAT operation functions by pressing 0 C HEAT button on the remote controller. The 0 C HEAT operation is almost the same operation as below settings. ( Table5 ) Mode Heating Setting temperature 0 C Fan mode AUTO 9. ECONOMY OPERATION The ECONOMY operation functions by pressing ECONOMY button on the remote controller. The ECONOMY operation is almost the same operation as below settings. ( Table6 ) Mode Cooling/ Dry Heating Target temperature Setting temp.+ C Setting temp.- C 0-4

19 0. DEFROST OPERATION CONTROL. CONDITION OF STARTING THE DEFROST OPERATION The defrost operation starts when the outdoor heat exchanger temperature sensor (Tn) detects the temperature lower than the values shown in Table7. ( Table 7 : Condition of starting Defrost Operation ) ST time defrosting Compressor integrating operation time after starting operation Less than 7 min. 7 to 57 min. More than 57 min. * : Ta (Outdoor air temperature) Does not operate - 9 C (Ta* - Tn = > 5 C) - 5 C Defrosting after ND time upon starting operation Compressor integrating operation time Less than 5 min. More than 5min. Does not operate Tn-Tn0 < - 5deg Tn-Tnb < - deg However, Tn - 6 C Tn - 5 C Tn0 : Temperature of continuous operation at 0minutes. Tnb : Back 5minutes temperature Integrating defrost (Constant monitoring) More than 0 min. (For long continuous operation) - C (and after 0 minutes, if the - C) Compressor integrating operation time More than 0 min. (For long continuous operation) - 5 C (and after 5 minutes, if the - 5 C) Less than 0min.* (For intermittent operation) OFF count of the compressor 40 times. * : If the compressor continuous operation time is less than 0 minutes and outdoor air temperature is less than C once while operating the compressor, the OFF number of the compressor is counted. If any defrost operated, the compressor OFF count is cleared.. CONDITION OF THE DEFROST OPERATION COMPLETION Defrost operation is released when the conditions become as shown in Table8. ( Table8 : Defrost Release Condition ) Release Condition Outdoor heat exchanger temperature sensor value is higher than + C or Compressor operation time has passed 5 minutes. 0-5

20 . Defrost Flow Chart The defrosting shall proceed by the integrating operation time, outdoor temperature and outdoor heat exchanger temperature as follows. Heating operation start : Compressor ON (Not defrosted for 0 minutes) st defrost nd and later defrost Integrating defrost (Constant monitoring) Compressor integrating operation: Over 7 min. Compressor integrating operation: Over 57 min. Compressor integrating operation: Over 5 min. Compressor OFF count : 40 times (Less than 0min.) Compressor integrating operation: Over 0 min. Compressor integrating operation: Over 0 min. Outdoor heat exchanger temperature: Below - 9 C (Ta - Tn = > 5 C) Outdoor heat exchanger temperature: Below - 5 C Tn-Tn0 < - 5deg Tn-Tnb < - deg However, Tn <- = 6 C Tn - 5 C Outdoor heat exchanger temperature: Below - C (and after 0 minutes, if the - C) Outdoor heat exchanger temperature: Below - 5 C (and after 5 minutes, if the - 5 C) Defrost start Defrost Indicator: [Operation lamp] 7 sec ON / sec OFF Compressor OFF Outdoor fan motor OFF 0 sec later four - way valve OFF 5 sec later compressor ON Outdoor heat exchanger temperature: Over + C or Compressor ON time: Maximum 5 minutes Defrost end 0-6

21 . OFF DEFROST OPEARTION CONTROL When operation stops in the [Heating operation] mode, if frost is adhered to the outdoor unit heat exchanger, the defrost operation will proceed automatically. In this time, if indoor unit operation lamp flashes slowly (7 sec ON / sec OFF), the outdoor unit will allow the heat exchanger to defrost, and then stop.. OFF DEFROST OPERATION CONDITION In heating operation, the outdoor heat exchanger temperature is less than -4 C, compressor continuous operation more than 0 minutes, and compressor operation integrating time lasts for more than 0 minutes.. OFF DEFROST END CONDITION Release Condition Outdoor heat exchanger temperature sensor value is higher than + C or Compressor operation time has passed 5 minutes. OFF Defrost Flow Chart Heating operation stop Outdoor heat exchanger temperature : Below -4 C Compressor continuous operation : Over 0 minutes Compressor integrating operation : Over 0 minutes Defrost start Defrost Indicater: [Operation lamp] 7 sec ON / sec OFF Outdoor heat exchanger temperature : Over + C or Compressor ON time : Maximum 5 minutes Defrost end 0-7

22 . VARIOUS PROTECTIONS. DISCHARGE GAS TEMPERATURE OVERRISE PREVENSION CONTROL The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas temperature. When the discharge temperature becomes higher than Temperature, the compressor frequency is decreased 0rps (4L) or 0rps (0L), and it continues to decrease the frequency for 0rps (4L) or 0rps (0L) every 0 seconds until the temperature becomes lower than Temperature. When the discharge temperature becomes lower than Temperature, the control of the control of the compressor frequency is released. When the discharge temperature becomes higher than Temperature, the compressor is stopped and the indoor unit LED starts blinking. ( Table 9 : Discharge Temperature Over Rise Prevension Control / Release Temperature ) Temperature Temperature Temperature AO*G4LFL / LFCC / 0LFT 04 C 0 C 0 C. CURRENT RELEASE CONTROL The compressor frequency is controlled so that the outdoor unit input current does not exceeds the current limit velue that was set up with the outdoor temperature. The compressor frequency returns to the designated frequency of the indoor unit at the time when the frequency becomes lower than the release value. ( Table 0- : Current Release Operation Value / Release Value for AO*G4LFL / LFCC / 0LFT ) [ Heating ] AO*G4LFL OT (Control / Release) 7 C C 5 C 0.5A / 0.0A.0A /.5A 5.0A / 4.5A 7.0A / 6.5A [ Heating ] AO*G4LFCC OT (Control / Release) 7 C C 5 C 0.5A / 0.0A.0A /.5A 5.0A / 4.5A 7.0A / 6.5A [ Heating ] AO*G0LFT OT (Control / Release) 7 C C 5 C.0A / 0.5A.0A /.5A 5.0A / 4.5A 8.0A / 7.5A OT : Outdoor Temperature OT : Outdoor Temperature OT : Outdoor Temperature [ Cooling ] AO*G4LFL OT (Control / Release) 7.0A / 6.5A 50 C 7.0A / 6.5A 46 C 9.5A / 9.0A 40 C.0A /.5A OT : Outdoor Temperature [ Cooling ] AO*G4LFCC OT (Control / Release) 7.0A / 6.5A 50 C 7.0A / 6.5A 46 C 9.5A / 9.0A 40 C.0A /.5A OT : Outdoor Temperature [ Cooling ] AO*G0LFT OT (Control / Release) 9.0A / 8.5A 50 C 0.0A / 9.5A 46 C.0A /.5A 40 C 6.0A / 5.5A OT : Outdoor Temperature 0-8

23 . ANTIFREEZING CONTROL (Cooling and Dry mode) The compressor frequency is decrease on cooling & dry mode when the indoor heat exchanger temperature sensor detects the temperature lower than Temperature. Then, the anti-freezing control is released when it becomes higher than Temperature. ( Table : Anti-freezing Protection Operation / Release Temperature ) Outdoor temperature Temperature Temperature Over than 0 C * or C * 7 C 4 C Less than 0 C * or C C * *. When the temperature rises. *. When the temperature drops. 0-9

24 4. COOLING PRESSURE OVERRISE PROTECTION When the outdoor unit heat exchange sensor temperature rises to 67 C or greater, the compressor is stopped and trouble display is performed. 5. HIGH TEMPERATURE AND HIGH PRESSURE RELEASE CONTROL ( HEATING MODE ) On heating mode, the compressor frequency is controlled as following based on the detection value of the indoor heat exchanger temperature sensor. [ Control System ] For AO*G4LFL / LFCC / 0LFT Indoor heat exchange temperature 6 C 55 C 5 C Compressor is stopped The compressor frequency is decreased 5rps(4L), 5rps(0L) every 0seconds. The compressor frequency is decreased 4rps(4L), rps(0l) every 0seconds. Stable zone It returns to the normal operation 50 C 6. COMPRESSOR TEMPERATURE PROTECTION When the compressor temperature sensor detects higher than 0 C(4L),08 C(0L), the compressor is stopped. The protection is released when the compressor temperature sensor detects 80 C after minutes of compressor stop. 7. HIGH PRESSURE PROTECTION When the pressure switch becomes OFF (Open : higher than 4. MPa), the compressor is stopped. It is released when the pressure switch becomes ON (Close : lower than. MPa) after minutes of compressor stop.. COMPRESSOR STOP CONTROL When the detection value of outdoor temperature sensor is lower than Temp in the table below, the compressor is stopped. ( Table : Operation temperature of compressor stop control ) Temperature Cooling Heating AO*G4LFL / LFCC / 0LFT -5 C 0-0

25 R40A WALL MOUNTED type INVERTER. TROUBLE SHOOTING

26 - ERROR DISPLAY -- INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY Please refer the flashing pattern as follows. Indoor Unit : AS*G4/ 0LFCA, 4LFCC The OPERATION, TIMER, ECONOMY lamps operate as follows according to the error contents. Error Contents Operation (Green) Indoor Unit Display Timer (Orange) Economy (Green) Wired Remote Controller Display Trouble shooting Serial Communication Error times times Continuous, Wired Remote Controller Communication Error times times Continuous Indoor Unit Model Information Error EEPROM Access Abnormal times times Continuous 4 Manual Auto Switch Error times 5 times Continuous 5 5 Indoor Room Error 4 times times Continuous 4 6 Indoor Heat Ex. Error 4 times times Continuous 4 7 Indoor Unit Fan Motor Error 5 times times Continuous 5 8 A. F. Voltage Error 6 times 4 times Continuous 64 9 IPM Error 6 times 5 times Continuous 65 0 Discharge Error 7 times times Continuous 7 Compressor Error 7 times times Continuous 7 Heat Ex. Liquid Outlet Error 7 times times Continuous 7 Outdoor Error 7 times 4 times Continuous 74 4 Current Sensor Error 8 times 4 times Continuous 84 5 High Pressure Switch Error 8 times 6 times Continuous 86 6 Over Current Error 9 times 4 times Continuous 94 7 Compressor Control Error 9 times 5 times Continuous 95 8 Outdoor Unit Fan Motor Error 9 times 7 times Continuous Way Valve Error 9 times 9 times Continuous 99 0 Discharge Temp. Error 0 times times Continuous A Compressure Temp. Error 0 times times Continuous A Low Pressure Error 0 times 5 times Continuous A5 0-0

27 -- WIRED REMOTE CONTROLLER DISPLAY (OPTION). SELF - DIAGNOSIS When " " in Temperature Display is displayed, inspection of the air conditioning system is necessary. Please consult authoilzed servise personnel. Unit number (usually 0) Error code SU MOTU WETH FR SA ex. Self-diagnosis check. ERROR CODE HISTORY DISPLAY Up to 6 memorized error codes may be displayed for the indoor unit connected to the remote controller.. Stop the air conditioner operation.. Press the SET TEMPERATURE buttons, simultaneously for seconds or more to start the self-diagnosis. Error code Error history number SU MOTU WETH FR SA. Press the SET TEMPERATURE button to select the error history number. Lower Raise 0 ı F E d c b A Press the SET TEMPERATURE buttons, simultaneously for seconds or more or there is no key input for 60 seconds to stop the display. 0-0

28 - TROUBLE SHOOTING WITH ERROR CODE Trouble shooting OUTDOOR UNIT Error Method: Serial Communication Error (Serial Reverse Transfer Error) Detective Actuators: Outdoor unit Main PCB Outdoor unit Fan motor Indicate or Display: Refer to error code table. Detective details: When the indoor unit cannot receive the serial signal from Outdoor unit more than minutes after power ON, or the indoor unit cannot receive the serial signal more than 5seconds during normal operation. Forecast of Cause:. Connection failure. External cause. Main PCB failure 4. Active filter module failure 5. Transistor PCB (IPM) failure 6. Filter PCB failure 7. Outdoor unit Fan motor failure Check Point - : Reset the power and operate NO Does error indication reappear? YES Check Point : Check connection Check any loose or removed connection line of between indoor unit and outdoor unit. >> If there is an abnormal condition, correct it by referring to Installation Manual or Data & Technical Manual. Check connection condition in control unit. (If there is loose connector, open cable or mis-wiring) Check Point - : Check external cause such as noise Check if the ground connection is proper. Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave). Check Point : Check the voltage of power supply Check the voltage of power supply >> Check if AC6V(AC40V-0%) - 64V(AC40V+0%) appears at outdoor unit terminal L - N. Check Point 4 : Check serial signal (Reverse transfer signal) Check serial signal (Reverse transfer signal) >> Check if indicated value swings between AC90V and AC70V at outdoor unit terminal -. >> If it is abnormal, Check the parts as follows. - Outdoor unit fan motor (PARTS INFORMATION 5) - Active filter module (PARTS INFORMATION 4) - Transistor PCB (IPM) (PARTS INFORMATION 7) - Filter PCB (Check the wire of CN0) >> If Outdoor fan motor is abnormal, replace Outdoor unit fan motor and Main PCB. >> If Active filter module or IPM is abnormal, replace it. >> If the parts are normal, replace Main PCB. WHITE RED WHITE L N

29 Trouble shooting INDOOR UNIT Error Method: Serial Communication Error (Serial Forward Transfer Error) Detective Actuators: Indoor unit Controller PCB Indicate or Display: Refer to error code table. Detective details: When the outdoor unit cannot properly receive the serial signal from indoor unit for 0 seconds or more. Forecast of Cause:. Connection failure. External cause. Controller PCB failure Check Point - : Reset the power and operate NO Does error indication reappear? YES Check Point : Check connection Check any loose or removed connection line of between indoor unit and outdoor unit. >> If there is an abnormal condition, correct it by referring to Installation Manual or Data & Technical Manual. Check connection condition in control unit. (If there is loose connector, open cable or mis-wiring) Check Point - : Check external cause such as noise Check if the ground connection is proper. Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave). Check Point : Check the voltage of power supply Check the voltage of power supply >> Check if AC6V(AC40V-0%) - 64V(AC40V+0%) appears at outdoor unit terminal L - N. Check Point 4 : Check serial signal (Forward transfer signal) Check serial signal (Forward transfer signal) >> Check if indicated value swings between AC0V and AC0V at outdoor unit terminal -. >> If it is abnormal, replace Controller PCB. WHITE RED WHITE L N

30 Trouble shooting INDOOR UNIT Error Method: Wired Remote Controller Communication Error Detective Actuators: Indoor unit Controller PCB Wired Remote Controller (Option) Indicate or Display: Refer to error code table. Detective details: When the indoor unit cannot properly receive the signal from Wired Remote Controller for minute or more. Forecast of Cause:. Connection failure. Wired Remote Controller failure. Controller PCB failure Check Point : Check the connection of terminal Check & correct the followings. Check the connection of terminal between Wired Remote Controller and indoor unit, and check if there is a disconnection of the cable. Check Point : Check Wired Remote Controller and Controller PCB Check Voltage at CN6 (terminal -) of Controller PCB. (Power supply to Remote Control) >> If it is DCV, Remote Control is failure. (Controller PCB is normal) >> Replace Remote Control >> If it is DC 0V, Controller PCB is failure. (Check Remote Control once again) >> Replace Controller PCB 0-05

31 Trouble shooting 4 INDOOR UNIT Error Method: Indoor Unit Model Information Error EEPROM Access Abnormal Detective Actuators: Indoor unit Controller PCB Indicate or Display: Refer to error code table. Detective details: When power is on and there is some below case.. When model information of EEPROM is incorrect.. When the access to EEPROM failed. Forecast of Cause:. External cause. Defective connection of electric components. Controller PCB failure Check Point - : Reset Power Supply and operate Does Error indication show again? NO YES Check Point : Check Indoor unit electric components Check all connectors. (loose connector or incorrect wiring) Check any shortage or corrosion on PCB. Check Point - : Check external cause such as noise Check if the ground connection is proper. Check if there is any equipment that causes harmonic wave near the power cable (Neon light bulb or any electronic equipment which causes harmonic wave). Check Point : Replace Controller PCB Change Controller PCB. Note : EEPROM EEPROM(Electronically Erasable and Programmable Read Only Memory) is a nonvolatile memory which keeps memorized information even if power is turned off. It can change the contents electronically. To change the contents, it uses higher voltage than normal, and it can not change a partial contents. (Rewriting shall be done upon erasing the all contents.) There is a limit in a number of rewriting. 0-06

32 Trouble shooting 5 INDOOR UNIT Error Method: Manual Auto Switch Error Detective Actuators: Indoor Unit Controller PCB Indicator PCB Manual Auto Switch Indicate or Display: Refer to error code table. Detective details: When the Manual Auto Switch becomes ON for consecutive 0 or more seconds. Forecast of Cause :. Manual Auto Switch failure. Controller PCB and Indicator PCB failure Check Point : Check the Manual Auto Switch Check if Manual Auto Switch is kept pressed. Check ON/OFF switching operation by using a meter. >> If Manual Auto Switch is disabled (on/off switching), replace it. Check Point : Replace Controller PCB and Indicator PCB If Check Point do not improve the symptom, replace Controller PCB and Indicator PCB and execute the check operation again. 0-07

33 Trouble shooting 6 INDOOR UNIT Error Method: Indoor Room Error Indicate or Display: Refer to error code table. Detective Actuators: Indoor unit Controller PCB Room temperature thermistor Detective details: Room temperature thermistor is open or short is detected always. Forecast of Cause :. Connector failure connection. failure. Controller PCB failuer Check Point : Check connection of Connector Check if connector is loose or removed Check erroneous connection Check if thermistor cable is open >>Reset Power when reinstalling due to removed connector or incorrect wiring. Check Point : Remove connector and check resistance value Characteristics (Rough value) Temperature ( C ) Resistance value (k ) Temperature ( C ) Resistance value (k ) If is either open or shorted, replace it and reset the power. Check Point : Check voltage of Controller PCB (DC5.0V) Make sure circuit diagram of each indoor unit and check terminal voltage at (DC5.0V) H/E RED CN WHITE DC CN Room Temp. If the voltage does not appear, replace Controller PCB and execute the check operation again. 0-08

34 Trouble shooting 7 INDOOR UNIT Error Method: Indoor Heat Ex. Error Indicate or Display: Refer to error code table. Detective Actuators: Indoor unit Controller PCB Heat exchanger (MID) Detective details: Heat exchanger (MID) thermistor is open or short is detected always. Forecast of Cause :. Connector failure connection. failure. Controller PCB failuer Check Point : Check connection of Connector Check if connector is loose or removed Check erroneous connection Check if thermistor cable is open >>Reset Power when reinstalling due to removed connector or incorrect wiring. Check Point : Remove connector and check resistance value Characteristics (Rough value) Temperature ( C ) Resistance value (k ) Temperature ( C ) Resistance value (k ) If is either open or shorted, replace it and reset the power. Check Point : Check voltage of Controller PCB (DC5.0V) Make sure circuit diagram of each indoor unit and check terminal voltage at (DC5.0V) H/E RED CN WHITE DC CN Room Temp. If the voltage does not appear, replace Controller PCB and execute the check operation again. 0-09

35 Trouble shooting 8 INDOOR UNIT Error Method: Indoor unit Fan Motor Error Indicate or Display: Refer to error code table. Detective Actuators: Indoor unit Controller PCB Indoor unit fan motor Detective details: When the condition that actual frequency of Indoor Fan is below / of target frequency is continued more than 56 seconds. Forecast of Cause:. Fan rotation failure. Fan motor winding open. Motor protection by surrounding temperature rise 4. Control PCB failure 5. Indoor unit fan motor failure Check Point : Check rotation of Fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) >>If Fan or Bearing is abnormal, replace it. Check Point : Check ambient temp. around motor Check excessively high temperature around the motor. (If there is any surrounding equipment that causes heat) >>Upon the temperature coming down, restart operation. Check Point : Check Indoor unit fan motor Check Indoor unit fan motor. (PARTS INFORMATION 4) >>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor. Check Point 4 : Replace Controller PCB If Check Point - do not improve the symptom, replace Controller PCB. 0-0

36 Trouble shooting 9 OUTDOOR UNIT Error Method: A.F Voltage Error Indicate or Display: Refer to error code table. Detective Actuators: Outdoor unit Main PCB Active filter module Detective details: When inverter input DC voltage is higher than 45V or lower than 80V. When a momentary power cut off occurred on low voltage Forecast of Cause :. External cause. Connector connection failure. Main PCB failure 4. Active filter module failure Check Point : Check external cause at Indoor and Outdoor (Voltage drop or Noise) Instant drop : Check if there is a large load electric apparatus in the same circuit. Momentary power failure : Check if there is a defective contact or leak current in the power supply circuit. Noise : Check if there is any equipment causing harmonic wave near electric line. (Neon bulb or electric equipment that may cause harmonic wave) Check the complete insulation of grounding. Check Point : Check connection of Connector Check if connector is removed. Check erroneous connection. Check if cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Check Active filter module Check Active filter module. (PARTS INFORMATION 6) >>If Active filter module is abnormal, replace it. Check Point 4 : Replace Main PCB If Check Point - do not improve the symptom, change Main PCB. 0-

37 Trouble shooting 0 OUTDOOR UNIT Error Method: IPM Error Indicate or Display: Refer to error code table. Detective Actuators: Outdoor unit Main PCB Compressor Detective details: When more than normal operating current to IPM in Main PCB flows, the compressor stops. After the compressor restarts, if the same operation is repeated within 40sec, the compressor stops again. If and repeats 5 times, the compressor stops permanently. Forecast of Cause :. Defective connection of electric components. Outdoor Fan Operation failure. Outdoor Heat Exchanger clogged 4. Compressor failure 5. Transistor PCB failure 6. Main PCB failure Check Point : Check connections of Outdoor Unit Electrical Components Check if the terminal connection is loose. Check if connector is removed. Check erroneous connection. Check if cable is open. >>Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Check Outdoor Fan, Heat Exchanger Is there anything obstructing the air distribution circuit? Is there any clogging of Outdoor Heat Exchanger? Is the Fan rotating by hand when operation is off? >> If the Fan Motor is locked, replace it. Check Point : Check Outdoor Fan Check Outdoor Fan Motor. (Refer to Trouble shooting 9) >> If the Fan Motor is failure, replace it. Check Point 4 : Check Compressor Check Compressor. (PARTS INFORMATION ) Check Point 5 : Check Transistor PCB Check Transistor PCB. (PARTS INFORMATION 7) Check Point 6 : Replace Main PCB If Check Point 5 do not improve the symptom, change Main PCB. 0-

38 Trouble shooting OUTDOOR UNIT Error Method: Discharge Error Detective Actuators: Outdoor unit Main PCB Discharge pipe temperature thermistor Indicate or Display: Refer to error code table. Detective details: When Discharge pipe temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure. failure. Main PCB failure Check Point : Check connection of connector Check if connector is removed. Check if connector is erroneous connection. Check if thermistor cable is open. >> Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check thermistor resistance value characteristics (Approx. value) Temperature ( C ) Resistance value (k ) Temperature ( C ) Resistance value (k ) If is either open or shorted, replace it and reset the power. Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V) AO*G4LFL AO*G4LFCC AO*G0LFT CN64 CN6 CN6 4 4 BROWN BROWN (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN7 CN70 CN7 4 4 (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN64 CN6 CN65 CN6 BROWN BROWN BLUE BLUE BROWN BROWN (Compressor temp.) (Outdoor temp.) (Heat exchanger) (Discharge pipe) If the voltage does not appear, replace Main PCB. 0-

39 Trouble shooting OUTDOOR UNIT Error Method: Compressor Error Detective Actuators: Outdoor unit Main PCB Compressor temperature thermistor Indicate or Display: Refer to error code table. Detective details: When Compressor temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure. failure. Main PCB failure Check Point : Check connection of connector Check if connector is removed. Check if connector is erroneous connection. Check if thermistor cable is open. >> Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check thermistor resistance value characteristics (Approx. value) Temperature ( C ) Resistance value (k ) Temperature ( C ) Resistance value (k ) If is either open or shorted, replace it and reset the power. Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V) AO*G4LFL AO*G4LFCC AO*G0LFT CN64 CN6 CN6 4 4 BROWN BROWN (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN7 CN70 CN7 4 4 (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN64 CN6 CN65 CN6 BROWN BROWN BLUE BLUE BROWN BROWN (Compressor temp.) (Outdoor temp.) (Heat exchanger) (Discharge pipe) If the voltage does not appear, replace Main PCB. 0-4

40 Trouble shooting OUTDOOR UNIT Error Method: Heat Ex. Liquid Outlet Error Indicate or Display: Refer to error code table. Detective Actuators: Outdoor unit Main PCB Heat exchanger temperature thermistor Detective details: When Heat exchanger temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure. failure. Main PCB failure Check Point : Check connection of connector Check if connector is removed. Check if connector is erroneous connection. Check if thermistor cable is open. >> Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check thermistor resistance value characteristics (Approx. value) Temperature ( C ) Resistance value (k ) If is either open or shorted, replace it and reset the power. Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V) AO*G4LFL AO*G4LFCC AO*G0LFT CN64 CN6 CN6 4 4 BROWN BROWN (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN7 CN70 CN7 4 4 (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN64 CN6 CN65 CN6 BROWN BROWN BLUE BLUE BROWN BROWN (Compressor temp.) (Outdoor temp.) (Heat exchanger) (Discharge pipe) If the voltage does not appear, replace Main PCB. 0-5

41 Trouble shooting 4 OUTDOOR UNIT Error Method: Outdoor Error Detective Actuators: Outdoor unit Main PCB Outdoor temperature thermistor Indicate or Display: Refer to error code table. Detective details: When Outdoor temperature thermistor open or short-circuit is detected at power ON or while running the compressor. Forecast of Cause :. Connector connection failure. failure. Main PCB failure Check Point : Check connection of connector Check if connector is removed. Check if connector is erroneous connection. Check if thermistor cable is open. >> Upon correcting the removed connector or mis-wiring, reset the power. Check Point : Remove connector and check thermistor resistance value characteristics (Approx. value) Temperature ( C ) Resistance value (k ) Temperature ( C ) Resistance value (k ) If is either open or shorted, replace it and reset the power. Check Point : Check voltage of Main PCB (DC5.0V) Make sure circuit diagram of outdoor unit and check terminal voltage at thermistor (DC5.0V) AO*G4LFL AO*G4LFCC AO*G0LFT CN64 CN6 CN6 4 4 BROWN BROWN (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN7 CN70 CN7 4 4 (Compressor temp.) (Outdoor temp.) (Discharge pipe) (Heat exchanger) CN64 CN6 CN65 CN6 BROWN BROWN BLUE BLUE BROWN BROWN (Compressor temp.) (Outdoor temp.) (Heat exchanger) (Discharge pipe) If the voltage does not appear, replace Main PCB. 0-6