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Fujitsu AU*G36LRLA Service Instruction
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Fujitsu AU*G36LRLA Service Instruction

3 phase type room air conditioner
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See also: Design & Technical Manual
SERVICE
INSTRUCTION
R410A
3 PHASE TYPE
ROOM AIR CONDITIONER
Single /
Simultaneous
operation multi type
Models
Indoor unit
Single type
AU*G36LRLA
AU*G45LRLA
AU*G54LRLA
AR*G36LMLA
ARTG36LHTB
AR*G45LMLA
AR*G45LHTA
ARTG45LHTB
AR*G54LHTA
ARTG54LHTB
ARTG60LHTA
AB*G36LRTA
AB*G45LRTA
AB*G54LRTA
Simultaneous
operation multi type
AU*G18LVLB
AU*G22LVLA
AU*G24LVLA
AR*G18LLLA
AR*G22LMLA
AR*G24LMLA
AB*G18LVTB
AB*G22LVTA
AB*G24LVTA
Outdoor unit
AO* G36LATT
AO* G45LATT
AO* G54LATT
AOTG60LATT

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Summary of Contents for Fujitsu AU*G36LRLA

  • Page 1 3 PHASE TYPE ROOM AIR CONDITIONER Single / Simultaneous operation multi type SERVICE INSTRUCTION Models Indoor unit Outdoor unit Single type AO* G36LATT AU*G36LRLA AO* G45LATT AU*G45LRLA AO* G54LATT AU*G54LRLA AOTG60LATT AR*G36LMLA ARTG36LHTB AR*G45LMLA AR*G45LHTA ARTG45LHTB AR*G54LHTA ARTG54LHTB R410A ARTG60LHTA...

  • Page 2: Table Of Contents

    CONTENTS 1. DESCRIPTION OF EACH CONTROL OPERATION 1-1 COOLING OPERATION.................... 01-01 1-2 HEATING OPERATION.................... 01-02 1-3 DRY OPERATION..................... 01-03 1-4 AUTO CHANGEOVER OPERATION................ 01-04 1-5 INDOOR FAN CONTROL..................01-06 1-6 OUTDOOR FAN CONTROL..................01-10 1-7 LOUVER CONTROL....................01-11 1-8 COMPRESSOR CONTROL..................01-17 1-9 TIMER OPERATION CONTROL................

  • Page 3: Table Of Contents

    2. TROUBLE SHOOTING 2-1 ERROR DISPLAY...................... 02-01 02-01 2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY..... 2-1-2 WIRED REMOTE CONTROLLER DISPLAY............02-02 02-03 2-2 TROUBLE SHOOTING WITH ERROR CODE............2-3 TROUBLE SHOOTING WITH NO ERROR CODE............ 02-34 2-4 SERVICE PARTS INFORMATION................02-39 3.
  • Page 5 AIR CONDITIONER 3 phase type Single / Simultaneous operation multi type 1 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 6: Cooling Operation

    1-1. COOLING OPERATION 1-1-1 COOLING CAPACITY CONTROL A sensor (room temperature thermistor) built in the indoor unit will usually perceive difference or variation between a set temperature and present room temperature, and controls the operation frequency of the compressor. The maximum frequency is limited in the range shown in Figure 1 based on the fan speed mode and the outdoor temperature.

  • Page 7: Heating Operation

    ( Fig 1-2 : Limit of Maximum Frequency based on Outdoor Temperature for Multi type ) [ rps ] Outdoor air Fan speed mode High Quiet Recital temperature AO *G36LATT A zone B zone A zone 36°C C zone 34°C D~ F zone B zone 32°C...

  • Page 8: Dry Operation

    1-3. DRY OPERATION 1-3-1 INDOOR UNIT CONTROL The compressor rotation frequency shall change according to set temperature and room temperature variation which the room temperature sensor of the indoor unit has detected as shown in the Fig 2. [ rps ] ( Table 3 : Compressor Frequency Range ) Frequency Recital...

  • Page 9: Auto Changeover Operation

    1-4. AUTO CHANGEOVER OPERATION When the air conditioner is set to the Auto mode by remote controller, operation starts in the optimum mode from among the Heating, Cooling, Dry and Monitoring mode. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set between 18°C and 30°C in 1°C steps.
  • Page 10 AUTO CHANGEOVER operation flow chart START Setting temperature Room temp. Ts + 2 °C ? Room temp. Ts - 2 °C ? Middle zone Operation mode COOLING (AUTO:DRY) HEATING OPERATION of outdoor unit : Cooling or Dry? OPERATION Thermostat remains Thermostat remains Operation mode in OFF state for 6 minutes or...

  • Page 11: Indoor Fan Control

    1-5. INDOOR FAN CONTROL 1. Fan speed (Table 5 : Indoor Fan Speed) [Multi type] AU *G18LVLB AU *G22/ 24LVLA Operation mode Air flow mode Speed (rpm) Operation mode Air flow mode Speed (rpm) Heating Heating Quiet Quiet Cool air prevention Cool air prevention Cooling Cooling...
  • Page 12 AB *G45LRTA AB *G54LRTA AB *G36LRTA Operation mode Air flow mode Speed (rpm) Operation mode Air flow mode Speed (rpm) Operation mode Air flow mode Speed (rpm) 1100 1200 1340 Heating Heating Heating 1000 1100 1250 1000 1150 Quiet Quiet Quiet Cool air prevention Cool air prevention...
  • Page 13 2. FAN OPERATION The airflow can be switched in 5 steps such as Auto, Quiet, Low, Med, High, while the indoor fan only runs. The High Static Pressure Duct type is 4 steps such as Auto, Low, Med, High. 3. COOLING OPERATION (Auto : Cooling) Switch the airflow [Auto], and the indoor fan motor will run according to a room temperature, as shown in Figure 7.
  • Page 14 5. COOL AIR PREVENTION CONTROL (Heating mode) The maximum value of the indoor fan speed is set as shown in Figure 9, based on the detected temperature by the indoor heat exchanger sensor on heating mode. When the compressor does not operate, the indoor fan motor operates [S-Lo] or [Stop] mode. ( Fig 9 : Cool Air Prevention Control ) [ Cassette, Ceiling type ] Indoor heat exchanger...

  • Page 15: Outdoor Fan Control

    1-6. OUTDOOR FAN CONTROL 1. Outdoor Fan Motor Following table shows the fan speed of the outdoor unit. (Table 6 : Fan speed of the outdoor unit) Cooling 850/ 780/ 520/ 480/ 400/ 350/ 280 rpm AO *G36/ 45LATT Upper fan 800/ 750/ 520/ 350/ 280/ 0 rpm Lower fan AO *G54LATT...

  • Page 16: Louver Control

    1-7. LOUVER CONTROL 1. For Floor / Ceiling type < AB *G18LVTB, AB *G22/ 24LVTA > (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 10 : Air Direction Range) (Operation Range) During Cooling / Heating / Dry / Fan mode : Use the air direction adjustments within the ranges shown above.
  • Page 17 (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 11 : Air Direction Range) RIGHT/LEFT air direction louvers Use the air direction adjustments within the ranges shown above. The remote control unit's display does not change. 1-4.
  • Page 18 2. For Ceiling Type < AB *G36/ 45/ 54LRTA > (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 12 : Air Direction Range) (Operation Range) During Cooling / Heating / Dry / Fan mode : Use the air direction adjustments within the ranges shown above.
  • Page 19 (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 13 : Air Direction Range) Use the air direction adjustments within the ranges shown above. The remote control unit's display does not change. 2-4.
  • Page 20 3. For Compact Cassette Type < AU *G18LVLB, AU *G22/ 24LVLA > (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 14 : Air Direction Range) (Operation Range) During Cooling / Heating / Dry / Fan mode : Use the air direction adjustments within the ranges shown above.
  • Page 21 4. For Cassette Type < AU *G36/ 45/ 54LRLA > (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 15 : Air Direction Range) (Operation Range) During Cooling / Dry / Fan mode : During Heating mode Use the air direction adjustments within the ranges shown above.

  • Page 22: Compressor Control

    1-8. COMPRESSOR CONTROL 1. OPERATION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in Table 7. (Table 7 : Compressor Operation Frequency Range) Cooling Heating indoor unit indoor unit 15rps 18rps 55rps 80rps 31 (29)rps...

  • Page 23: Timer Operation Control

    1-9. TIMER OPERATION CONTROL 1-9-1 Wireless Remote Controller AR- RAH1E, RAH2E ON / TIMER OFF / TIMER PROGRAM TIMER SLEEP TIMER 1. ON / OFF TIMER OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 24 3. SLEEP TIMER If the sleep timer 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 1 degC.

  • Page 25: Wired Remote Controller

    1-9-2 Wired Remote Controller AR- WAE1E ON / TIMER OFF / TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER 1. ON / OFF TIMER OFF timer : When the clock reaches the set time, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 26 2-2. DAY OFF setting The DAY OFF setting is only available for days for which weekly settings already exist. If the operating time carries over to the next day (during a next day setting), the effective DAY OFF range will be set as shown below. Normal DAY OFF Operation mode...

  • Page 27: Electronic Expansion Valve Control

    1-10. 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 following values. 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.

  • Page 28: Way Valve Extension Select

    1-13. 4-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 4-way valve is switched in 3 minutes later after the compressor stopped. 1-14. AUTO RESTART When the power was interrupted by a power failure, etc.

  • Page 29: Pump Down

    1-16. PUMP DOWN Operate [PUMP DOWN] switch on the display board. < PUMP DOWN Procedure > (1) Confirm that power is off, and open the service panel. (2) Turn the power on. : Light OFF : Light ON TEST PUMP POWER LOW NOISE PEAK CUT...

  • Page 30: Compressor Preheating

    1-17. COMPRESSOR PREHEATING When the outdoor heat exchanger temperature is lower than 0°C and after 30 minutes has passed after power-on or operation stop, 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 temperature rises to 2°C or greater, preheating is ended.
  • Page 31 3. Defrost Flow Chart The defrosting shall proceed by the integrating operation time and outdoor heat exchanger emperature as follows. Heating operation start : Compressor ON (Not defrosted for 10 minutes) In case of 2nd In case of Integrating defrost In case of 1st defrost and later defrost for intermittent operation...

  • Page 32: Off Defrost Operation Control

    1-19. OFF DEFROST OPERATION CONTROL When operation stops in the HEATING 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 / 2 sec OFF), the outdoor unit will allow the heat-exchanger to defrost, and then stop.

  • Page 33: Economy Operation

    1-20. ECONOMY OPERATION The ECONOMY operation functions by pressing ECONOMY button on the remote controller. At the maximum output, ECONOMY Operation is approximately 70% of normal air conditioner operation for cooling and heating. The ECONOMY operation is almost the same operation as below settings. (Table 12 ) Mode Cooling/ Dry...
  • Page 34 3. LOW PRESSURE PROTECTION CONTROL <Cooling mode> <After the compressor start-up and 10 minutes has passed> When the pressure sensor detected value is 0.68MPaG or less continues for 1minute, the compressor frequency -8rps. <After the frequency of the compressor -8rps and 1 minute has passed> When the pressure sensor detected value is 0.68MPaG or less, continues for 1 minute, the compressor continues frequency (Fig 18 : Low pressure protection control)
  • Page 35 6. HEATING OVERLOAD PROTECTION In Heating mode, the compressor frequency is controlled as following based on the detection value of the indoor heat-exchanger temperature sensor and pressure sensor. 6-1. HIGH TEMPERATURE 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.

  • Page 36: Forced Cooling Operation

    1-23. FORCED COOLING OPERATION (When using the Wireless RC) The FORCED COOLING OPERATION starts up when MANUAL / AUTO button is pressed more than 10 seconds. During the FORCED COOLING OPERATION, it keeps operation regardless of detection value of room temperature sensor. Operation LED and Timer LED blinks simultaneously while the unit is on the FORCED COOLING OPERATION.

  • Page 37: Drain Pump Operation

    1-27. DRAIN PUMP OPERATION (For AU/ AR type) During Cooling / Dry mode 1. When the compressor starts, the drain pump starts simultaneously. 2. The drain pump operates continuously for 3 minutes after the compressor is turned off. 3. When the compressor stops by the "Anti- freezing protection", the drain pump is turned off in 1 hour after the compressor stops.

  • Page 38: Low Noise Operation

    1-28. LOW NOISE OPERATION The compressor frequency and the outdoor unit fan speed are limited to reduce the operation noise by External Input. During the LOW NOISE OPERATION, "CURRENT OVERLOAD OPERATION", "ECONOMY OPERATION" and "PEAK CUT OPERATION" are effective, and the outdoor unit operates by lowest current of them. However, during the DEFROST OPERATION, the compressor operates by the frequency for DEFROST OPERATION.

  • Page 39: Description Of Display Unit

    1-30. DESCRIPTION OF DISPLAY UNIT 1-30-1 Layout of Display Unit Various settings can be adjusted by changing Dip switches and Push switches on the board of the outdoor unit. • ( Excerpt from the "INSTALATION MANUAL" ) LED DISPLAY (2) (3) (4) SW1 (DIP-SW) PUSH SWITCH Display lamp...

  • Page 40: Display Mode

    1-30-2 Display mode In this mode, the "Operation Condition" and "Error Code" can be displayed by Push Switch on outdoor unit PCB • (Table :17 Display pattern) Power / Mode Display Item L1 L2 L3 L4 Compressor frequency Upper fan speed (Outdoor unit) Lower fan speed (Outdoor unit) EEV pulse Present Value...
  • Page 41 (Table 19 : Detail of LED Display Data) : Light OFF : Light ON 1 : 1 Time Blinking Power Error Item No, Display Item Mode Compressor 1 ~ 15 Frequency 16 ~ 30 ( 0 ~ 95rps ) 31 ~ 45 46 ~ 60 61 ~ 75 76 ~ 90...
  • Page 42 : Light OFF : Light ON 1 : 1 Time Blinking Power Item No, Error Display Item Mode ~ -15 Outdoor Air -15 ~ -5 Temperature -5 ~ 5 ( -30 ~ 70°C ) 5 ~ 15 15 ~ 25 25 ~ 35 35 ~ 45 45 ~...

  • Page 43: Error History Mode

    1-30-3 Error history mode • In this mode, the history of abnormality that occurred in the past can be confirmed. (Table : 20 Procedure for History Mode ) Power Procedure Operation Error Mode During status display, press the MODE SWITCH 2 times. (Status display : Outdoor unit is stopping and no error) When the POWER / MODE LED blinking 2 times, press the ENTER SWITCH.

  • Page 44: Error Check Mode

    1-30-4 ERROR CHECK MODE In this mode, abnormality that is occurring now can be confirmed. • (Table : 22 Procedure for Error Check Mode ) n : n Times Blinking : Light OFF : Light ON 2 : 2 Times Blinking Power Procedure Operation...
  • Page 45 AIR CONDITIONER 3 phase type Single / Simultaneous operation multi type 2. TROUBLE SHOOTING...

  • Page 46: Error Display

    2. TROUBLE SHOOTING 2-1 ERROR DISPLAY 2-1-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY 1. ERROR DISPLAY Please refer the blinking pattern as follows. The Operation, Timer, Economy lamps operate as follows according to the error contents. Indoor Unit Display Wired Remote Trouble Controller...

  • Page 47: Wired Remote Controller Display

    2-1-2 WIRED REMOTE CONTROLLER DISPLAY 1. SELF - DIAGNOSIS When " Er " in Temperature Display is displayed, inspection of the air conditioning system is necessary. Please consult authorized service personnel. Unit number (usually 0) Error code SU MOTU WETH FR SA ex.

  • Page 48: Trouble Shooting With Error Code

    2-2 TROUBLE SHOOTING WITH ERROR CODE Trouble shooting 1 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Serial communication error (Serial reverse transfer error) Detective Actuators: Detective details: When the indoor unit cannot receive the serial signal from Outdoor unit Outdoor unit Main PCB more than 2minutes after power ON, or the indoor unit cannot receive Outdoor unit fan motor...
  • Page 49 Trouble shooting 2 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Serial communication error (Serial forward transfer error) Detective Actuators: Detective details: Indoor unit Controller PCB When the indoor unit cannot properly receive the serial signal from outdoor unit for 10 seconds or more.
  • Page 50 Trouble shooting 3 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Wired remote controller communication error Detective Actuators: Detective details: Upon receiving the signal more than 1 time from Wired remote controller, Indoor unit Controller PCB but the same signal has not been received more than 1 minute.
  • Page 51 Trouble shooting 4 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Unit number or Refrigerant circuit address setting error Detective Actuators: Detective details: When the addresses set in indoor units are not consecutive Indoor unit Controller PCB in the same refrigerant circuit.
  • Page 52 Trouble shooting 5 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Indoor unit capacity error Detective Actuators: Detective details: When the total capacity of indoor units does not match Outdoor Unit Main PCB outdoor capacity while 3 minutes after power-on. Forecast of Cause : 1.
  • Page 53 Trouble shooting 6 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Connection unit number error (indoor secondary unit) Detective Actuators: Detective details: Indoor unit When there are 4 or more indoor units in the same refrigerant system. Forecast of Cause : 1.
  • Page 54 Trouble shooting 7 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Primary unit, secondary unit setup error Detective Actuators: Detective details: Indoor unit Controller PCB When there is no master unit in the same refrigerant system. When 2 or more master units are connected in the same reffigerant system.
  • Page 55 Trouble shooting 8 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor unit PCB model information error Detective Actuators: Detective details: When power is on and there is some below case. Indoor unit Controller PCB 1. When model information of EEPROM is incorrect 2.
  • Page 56 Trouble shooting 9 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Manual auto switch Error Detective Actuators: Detective details: Indoor unit Controller PCB When the Manual Auto Switch becomes ON for consecutive 60 or Indicator PCB more seconds.
  • Page 57 Trouble shooting 10 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Room temp. sensor error Detective Actuators: Detective details: Indoor unit Controller PCB When Room Temperature Thermistor open or short-circuit is Room temperature thermistor detected at power ON. Forecast of Cause : 1.
  • Page 58 Trouble shooting 11 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor unit Heat Ex. middle temp. sensor error Detective Actuators: Detective details: Indoor unit Controller PCB When Heat exchanger temperature thermistor (Middle) open or short-circuit is detected at power ON. Heat exchanger temperature thermistor (Middle) Forecast of Cause : 1.
  • Page 59 Trouble shooting 12 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor unit fan motor error Detective Actuators: Detective details: Indoor unit Controller PCB When the condition that actual rev. of Indoor Fan is 1/3 or less. Indoor unit Power PCB Or the condition of fan speed is 0rpm is continued more than 56 seconds.
  • Page 60 Trouble shooting 13 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Drain pump error Detective Actuators: Detective details: Indoor unit Controller PCB When Float switch is ON for more than 3 minutes. Float switch Forecast of Cause : 1.
  • Page 61 Trouble shooting 14 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Outdoor unit main PCB model information error or communication error Detective details: Detective Actuators: When power is on and there is some below case. Outdoor unit Main PCB When model information of EEPROM is incorrect.
  • Page 62 Trouble shooting 15 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Inverter error Detective Actuators: Detective details: Outdoor unit Main PCB When there is communication error between Main PCB and Inverter PCB. Outdoor unit Inverter PCB When "Inverter PCB cement resistor difference voltage between both ends"...
  • Page 63 Trouble shooting 16 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. PFC circuit Error Detective Actuators: Detective details: When communication error between Main PCB and PFC PCB Outdoor unit Main PCB continues for 10 seconds. Outdoor unit PFC PCB When PFC PCB circuit error continues for 10 seconds.
  • Page 64 Trouble shooting 17 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Trip terminal L error Detective details: Detective Actuators: When the signal from FO terminal of IPM in Inverter PCB is "L"(=0V) Outdoor unit Inverter PCB while the compressor stops.
  • Page 65 Trouble shooting 18 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge temp. sensor error Detective Actuators: Detective details: Outdoor unit Main PCB When Discharge pipe temperature thermistor open or short-circuit Discharge pipe temperature thermistor is detected at power ON or while running the compressor. Forecast of Cause : 1.
  • Page 66 Trouble shooting 19 Indicate or Display: OUTDOOR UNIT Error Method: Compressor temp. sensor error Detective Actuators: Detective details: Outdoor unit Main PCB When Compressor temperature thermistor open or short-circuit Compressor temperature thermistor is detected at power ON or while running the compressor. Forecast of Cause : 1.
  • Page 67 Trouble shooting 20 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor unit Heat Ex. liquid temp. sensor error Detective Actuators: Detective details: Outdoor unit Main PCB When Heat exchanger temperature thermistor open or Heat exchanger temperature thermistor (MID) short-circuit is detected at power ON or while running the compressor.
  • Page 68 Trouble shooting 21 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor temp. sensor error Detective Actuators: Detective details: Outdoor unit Main PCB When Outdoor temperature thermistor open or short-circuit Outdoor temperature thermistor is detected at power ON or while running the compressor. Forecast of Cause : 1.
  • Page 69 Trouble shooting 22 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Heat sink temp. sensor error Detective Actuators: Detective details: Outdoor unit Inverter PCB When Heat sink temperature thermistor open or Heat sink temperature thermistor (PFC) short-circuit is detected at power ON or while running the compressor.
  • Page 70 Trouble shooting 23 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Current sensor error Detective Actuators: Detective details: After compressor runs for 1 minute or more, and while it runs Outdoor unit Inverter PCB in 50Hz or more. Outdoor unit Filter PCB When outdoor current value (A/D data) of Input Current Sensor has detected [00H].
  • Page 71 Trouble shooting 24 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Pressure sensor error Detective Actuators: Detective details: 30 seconds or more after power-on, when pressure sensor detection Outdoor unit Main PCB value detects the condition below continuously for 30 seconds or more. Pressure sensor >...
  • Page 72 Trouble shooting 25 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Trip detection Detective Actuators: Detective details: When over current flows in Inverter PCB, the compressor stops. Outdoor unit Inverter PCB After the compressor restarts, if the same error is repeated within Compressor 40sec, the compressor stops reappear.
  • Page 73 Trouble shooting 26 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor rotor position detection error (permanent stop) Detective Actuators: Detective details: When "compressor location detection error" is detected consecutively Outdoor unit Inverter PCB 5 times, within 40 seconds after start-up. Compressor Forecast of Cause : 1.
  • Page 74 Trouble shooting 27 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor unit fan motor error Detective Actuators: Detective details: When outdoor fan rotation speed is less than 100rpm in 20 seconds Outdoor unit Main PCB after fan motor starts, fan motor stops.
  • Page 75 Trouble shooting 28 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. 4-way valve error Detective Actuators: Detective details: When the indoor heat exchanger temperature is compared with Indoor unit Controller PCB the room temperature, and either following condition is detected Heat exchanger temperature thermistor continuously two times, the compressor stops.
  • Page 76 Trouble shooting 29 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge temp. error Detective Actuators: Detective details: Outdoor unit Main PCB When the discharge temperature becomes higher than 115°C. Discharge pipe temperature thermistor When detecting it 2 times within 24 hours, the compressor stops. Forecast of Cause : 1.
  • Page 77 Trouble shooting 30 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressure temp. error Detective Actuators: Detective details: When the compressor temperature becomes 110°C or more. Outdoor unit Main PCB When detecting it 2 times within 24 hours, Compressor temperature thermistor the compressor stops permanently.
  • Page 78 Trouble shooting 31 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Low pressure error Detective Actuators: Detective details: In cooling operation, 1 minute or more after compressor's start-up, Outdoor unit Main PCB when pressure sensor detects 0.12 MPa or less for consecutive Pressure sensor 5 minutes.

  • Page 79: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Trouble shooting 32 Forecast of Cause: 1. Power supply failure 2. External cause Indoor Unit - No Power 3. Electrical components defective Check Point 1 : Check installation condition Isn’t the breaker down? Check loose or removed connection cable.
  • Page 80 Trouble shooting 33 Forecast of Cause: 1. Power supply failure 2. External cause Outdoor Unit - No Power 3. Electrical components defective Check Point 1 : Check installation condition Isn’t the breaker down? Check loose or removed connection cable. >> If abnormal condition is found, correct it by referring to manual. Check Point 2 : Check external cause at indoor unit and outdoor unit(Voltage drop or noise) Instant voltage drop of ----- Check if there is a abnomally large load in the same power supply...
  • Page 81 Trouble shooting 34 Forecast of Cause: 1. Setting / Connection failure 2. External cause No Operation (Power is ON) 3. Electrical component defective Check Point 1 : Check indoor and outdoor installation condition Indoor unit - Check incorrect wiring between indoor unit - remote controller, or terminals between indoor units. Or, check if there is an open cable connection.
  • Page 82 Trouble shooting 35 Forecast of Cause: 1. Indoor unit error 2. Outdoor unit error No Cooling / No Heating 3. Effect by surrounding environment 4. Connection pipe / Connection wire failure 5. Refrigeration cycle failure Check Point 1 : Check indoor unit Does indoor unit Fan run on high fan? Is Air filter dirty? Is Heat exchanger clogged?
  • Page 83 Trouble shooting 36 Forecast of Cause : 1. Abnormal installation(Indoor unit / outdoor unit) Abnormal Noise 2. Fan failure(Indoor unit / outdoor unit) 3. Compressor failure (Outdoor unit) Diagnosis method when abnormal noise is occurred Abnormal noise is coming from indoor unit. Abnormal noise is coming from outdoor unit.

  • Page 84: Service Parts Information

    2-4 SERVICE PARTS INFORMATION SERVICE PARTS INFORMATION 1 Compressor Diagnosis method of Compressor (If outdoor unit LED displays error, refer to Trouble shooting ) Abnormal noise Stops soon after starting up Does not start up Is there open or loose connection Check if vibration noise by Is there open or loose connection cable?
  • Page 85 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check connection Check terminal connection of Compressor Check connection of Inverter PCB (Loose or incorrect wiring) (Loose or incorrect wiring) TM806 U(R) W(C) (RED) (BLACK) BLACK TM805 Inverter PCB Inverter PCB TM804 WHITE V(S)
  • Page 86 SERVICE PARTS INFORMATION 3 Outdoor unit Electronic Expansion Valve ( EEV ) Check Point 1 : Check Connections Check connection of connector ( Loose connector or open cable ) EXPANSION VALVE COIL BROWN BLUE CN17 ORANGE YELLOW WHITE Check Point 3 : Check noise at start up Check Point 2 : Check Coil of EEV Remove connector, check each winding Turn on Power and check operation noise.
  • Page 87 SERVICE PARTS INFORMATION 4 Indoor unit fan motor For AR *G45/ 54LHTA Check Point 1 : Check resistance of indoor fan motor Check each winding resistance of the motor >>If Resistance value is abnormal, replace motor. Blue (Low) Resistance value Lead wire color (20°C) Violet (Int.1)
  • Page 88 SERVICE PARTS INFORMATION 5 Outdoor unit fan motor Check Point 1 : 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 2 : Check resistance of outdoor fan motor Refer to below.
  • Page 89 AIR CONDITIONER 3 phase type Single / Simultaneous operation multi type 3. DISASSEMBLY PROCESS...
  • Page 90 3. DISASSEMBLY PROCESS WARNING Before servicing the unit, turn the power supply switch OFF, Then, do not touch electric parts for 10 minutes due to the risk of electric shock. 1. Appearance 2. SERVICE PANEL removal Hook (3 places) screw (serrated) Remove the mounting screws.
  • Page 93 5-4. CAPACITOR PCB removal screw Hook Remove the connectors, codes Remove the CONDENSER CASE and screw. by sliding rightward. screw Remove the mounting screws. Remove the CONDENSER COVER CAPACITOR PCB by sliding toward. Locking spacers Remove the locking spacers. 03-04...
  • Page 100 16. Precautions for exchange of refrigerant-cycle-parts (1) During exchange the following parts shall be protected by wet rag and not make the allowable temperature or more. (2) Remove the heat insulation when there is the heat insulation near the welding place. Move and cool it when its detaching is difficult.
  • Page 101 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan May. 2012 Printed in Japan...

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