Fujitsu AO G18LBCA Series Service Instruction
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Fujitsu AO G18LBCA Series Service Instruction

Fujitsu AO G18LBCA Series Service Instruction

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SERVICE
INSTRUCTION
R410A
SPLIT TYPE
ROOM AIR CONDITIONER
Cassette
INVERTER
Models Indoor unit
AUXG18LRLB
AUXG24LRLB
RCG18LRLB
RCG24LRLB
type
Outdoor unit
AO*G18LBCA
AO*G24LBCA
RCG18LRLB
RCG24LRLB

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Summary of Contents for Fujitsu AO G18LBCA Series

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER Cassette type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AO*G18LBCA AUXG18LRLB AO*G24LBCA AUXG24LRLB RCG18LRLB RCG18LRLB RCG24LRLB RCG24LRLB R410A...

  • Page 2: Table Of Contents

    CONTENTS 1. SPECIFICATIONS 1. DESCRIPTION OF EACH CONTROL OPERATION 1-1 COOLING OPERATION.................... 01-01 1-2 HEATING OPERATION..................... 01-02 1-3 DRY OPERATION...................... 01-03 01-04 1-4 AUTO CHANGEOVER OPERATION................ 1-5 INDOOR FAN CONTROL..................01-06 1-6 AIR FLOW DIRECTION CONTROL ................. 01-09 1-7 OUTDOOR FAN CONTROL..................01-10 1-8 COMPRESSOR CONTROL..................

  • Page 3: Description Of Each Control Operation

    R410A Cassette type INVERTER 1 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 4: 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. * If the room temperature is 6.0°C higher than a set temperature, the compressor operation frequency will attain to maximum performance.

  • Page 5: Heating Operation

    1-2. HEATING OPERATION 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. * If the room temperature is lower 6.0°C than a set temperature, the compressor operation frequency will attain to maximum performance.

  • Page 6: 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 Table 3. ( Table 3 : Compressor frequency ) Operating frequency X zone 34rps...

  • Page 7: 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, 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 0.5°C (wireless and 2WIRE remote controller) Or 1.0°C (3WIRE remote controller) steps.
  • Page 8 AUTO CHANGEOVER operation flow chart START Setting temperature Monitor mode Room temp. Ts+2 °C ? Room temp. Ts -2 °C ? Middle zone Auto change over is second or more? Operation mode before the monitor mode is cooling mode? Operation mode of HEATING OPERATION COOLING OPERATION outdoor unit : Cooling?

  • Page 9: Indoor Fan Control

    1-5. INDOOR FAN CONTROL 1. Fan speed ( Table 5 : Standard of Indoor Fan Speed ) *The following fan speed is a standard value. Operation Air flow Speed (rpm) mode mode Model 18 Model 24 Heating HIGH MED+ Quiet Cool air prevention Cooling HIGH...
  • Page 10 4. HEATING OPERATION Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Fig.6. On the other hand, if switched in [Hi ] ~ [Lo ], the indoor motor will run at a constant airflow of [HEAT] operation modes Lo, Me, Hi , as shown in Table5.
  • Page 11 7. FAN CONTROL FOR ENERGY SAVING When the air flow setting except AUTO mode, the indoor fan motor will run as shown in Fig.8. ( Fig 8 : Indoor Fan Control) Compressor Indoor fan Setting air flow 480rpm S-Lo (sec) Factory setting) Setting Description Function Number...

  • Page 12: Air Flow Direction Control

    1-6. AIR FLOW DIRECTION CONTROL Individual control To independently can be set the airflow pattern of each louver as this image. (Fig.10 : Independent louver control image) This function is given priority to overall louver control. But this function is release during the following operation. Cold air prevention control Monitor mode on the auto change over operation Defrost operation...

  • Page 13: Outdoor Fan Control

    1-7. OUTDOOR FAN CONTROL 1. Outdoor Fan Motor ollow ing table shows the fan speed of the outdoor unit. ( Table 6 : Fan speed of the outdoor unit ) Cooling Heating Low ambient cooling / Dry F zone G zone H zone Normal Normal...

  • Page 14: 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 / Dry Heating 10rps 120rps 12rps 120rps 2.

  • Page 15: Timer Operation Control

    1-9. TIMER OPERATION CONTROL 1-9-1 Wired Remote Controller UTY-RNR*Z1(2 wire remote controller) ON / TIMER OFF / TIMER WEEKLY TIMER *3 wire remote controller can be connected If 3 wire remote controller is connected, set the DIP-SW on the controller PCB Refer to the installation manual for detailed.
  • Page 16 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 17 1-9-2 Wireless Remote Controller (OPTION) AR-REJ1E 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 ON timer : When the clock reaches the set time, the air conditioner will be turned on.
  • Page 18 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 19: 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 and the outdoor temperature sensor. The pulse range of the electronic expansion valve control is 52 ~ 480 pulses (Cooling) and 52 ~ 480 pulses (Heating).

  • Page 20: Auto Restart

    1-14. 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 resumed with the memorized operation contents. When the power is interrupted and recovered during timer operation, timer operation is canceled, but only setting time is memorized.

  • Page 21: Compressor Preheating

    1-16. COMPRESSOR PREHEATING When the outdoor temperature is lower than 0°C and the all operation mode has been stopped for 30 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 temperature rises to 25°C or greater, preheating is ended.

  • Page 22: Defrost Operation Control

    1-19. DEFROST OPERATION CONTROL 1. 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 Table11. ( Table 11 : Condition of starting Defrost Operation ) Compressor integrating operation time time defrosting after starting operation...
  • Page 23 3. 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 10 minutes) 1st defrost 2nd and later defrost Integrating defrost (Constant monitoring) Compressor Compressor...

  • Page 24: Off Defrost Operation Control

    1-20. 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 (6 sec ON / 2 sec OFF), the outdoor unit will allow the heat exchanger to defrost, and then stop.

  • Page 25: Various Protections

    1-21. VARIOUS PROTECTIONS 1. DISCHARGE GAS TEMPERATURE OVERRISE PREVENTION 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 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until the temperature becomes lower than Temperature .
  • Page 26 3. 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 16 : Anti-freezing Protection Operation / Release Temperature) Outdoor temperature Temperature...

  • Page 27: Drain Pump Operation

    1-22. DRAIN PUMP OPERATION 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 as show in Fig15. 3. When the compressor stops by the "Anti- freezing protection", the drain pump is turned off in 1 hour after the compressor stops.

  • Page 28: Human Sensor(Option)

    1-23. HUMAN SENSOR (OPTION) Auto saving operation If no one enters the room during the set time (15, 30, 60, 90, 120, 180 minutes), the set temperature will be automatically controlled. (When someone comes back into the room, the human sensor will detect this, and automatically revert to the original settings).

  • Page 29: Trouble Shooting

    R410A Cassette type INVERTER 2 . TROUBLE SHOOTING...

  • Page 30: Error Display

    2 ERROR DISPLAY 2-1 INDOOR UNIT AND WIRED REMOTE CONTROLLER DISPLAY Check the Error LED display on the Indoor unit (IR Receiver *Option ) 1. Check ECONOMY (Green) LED Blinking, it means the Error on the system. (Not brinking: No Error) 2.

  • Page 31: Trouble Shooting With Error Code

    2-2 TROUBLE SHOOTING WITH ERROR CODE Indicate or Display: Trouble shooting 1 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 11 Serial communication error (Serial Reverse Transfer Error) Detective details: Detective Actuators: 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 32 Trouble shooting 2 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Serial Communication Error Error code : 11 (Serial Forward Transfer Error) Detective Actuators: Detective details: When the outdoor unit cannot properly receive the serial signal from Indoor unit Controller PCB indoor unit for 10 seconds or more.
  • Page 33 Trouble shooting 3 Indicate or Display: INDOOR UNIT Error Method: Error code : 12 Outdoor unit : No indication Wired Remote Controller Communication Error Detective Actuators: Detective details: Indoor unit Controller PCB When the indoor unit cannot properly receive the signal from Wired Remote Controller Wired Remote Controller for 1 minute or more.
  • Page 34 Trouble shooting 4 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 18 External communication error Detective Actuators: Detective details: External communication error After receiving a signal from the external I/O PCB, the same a signal has not been received for 15sec Forecast of Cause : 1.
  • Page 35 Trouble shooting 5 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 23 Combination error Detective Actuators: Detective details: 1. The outdoor unit receives the serial signal of applied refrigerant information Indoor unit from Indoor unit. When the refrigerant is R410a. 2.
  • Page 36 Trouble shooting 6 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 26 Indoor unit address setting error Detective details: Detective Actuators: When the address number set by auto setting and manual setting are mixed in Wired remote controller ( 2-Wire ) one RC group.
  • Page 37 Trouble shooting 7 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 29 Connection unit number error (Indoor unit in Wired remote controller system) Detective details: Detective Actuators: When the number of connecting indoor units are out of specified rule. Wired remote controller ( 2-Wire ) Indoor unit Controller PCB circuit Forecast of Cause : 1.
  • Page 38 Trouble shooting 8 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Indoor unit PCB model Error code : 32 information error Detective details: Detective Actuators: When power is on and there is some below case. Indoor unit Controller PCB 1.
  • Page 39 Trouble shooting 9 Indicate or Display: INDOOR UNIT Error Method: ERROR CODE : 35 Outdoor unit : No indication Manual Auto Switch Error Detective Actuators: Detective details: Indoor Unit Controller PCB When the Manual Auto Switch becomes ON for consecutive 30 or Indicator PCB more seconds.
  • Page 40 Trouble shooting 10 Indicate or Display: INDOOR UNIT Error Method: Indoor unit Communication circuit Outdoor unit : No indication Error code : 3A (wired remote controller) error Detective details: Detective Actuators: Detect the communication error of microcomputer and communication PCB. Indoor unit Controller PCB circuit Forecast of Cause : 1.Communication PCB defective...
  • Page 41 Indicate or Display: Trouble shooting 11 INDOOR UNIT Error Method: Error code : 41 Outdoor unit : No indication Indoor Room Thermistor Error Detective details: Detective Actuators: Indoor Unit Controller PCB Circuit Indoor unit thermistor is open or short is detected always. Indoor Temperature Thermistor Forecast of Cause : 1.
  • Page 42 Trouble shooting 12 rouble shooting Indicate or Display: INDOOR UNIT Error Method: INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 42 Indoor Heat Ex. Thermistor Error Detective Actuators: Detective details: Indoor Unit Controller PCB Indoor unit thermistor is open or short is detected always. Heat Exchanger (MID) Thermistor Forecast of Cause : 1.
  • Page 43 Trouble shooting 13 Indicate or Display: INDOOR UNIT Error Method: Error code : 44 Outdoor unit: No indication Human sensor error Detective Actuators: Detective details: Indoor unit Main PCB Detect the open condition of the sensor. 2 When the signal from the sensor is "L"(=0V) for more than 10 min. Forecast of Cause: u l i 2.
  • Page 44 Indicate or Display: Trouble shooting 14 INDOOR UNIT Error Method: Error code : 51 Outdoor unit : No indication Indoor Unit Fan Motor Error Detective Actuators: Detective details: Indoor unit Power Supply PCB When the fan motor speed is less than 1/3 of the target fan speed Indoor unit fan motor for 56 seconds.
  • Page 45 Indicate or Display: Trouble shooting 15 INDOOR UNIT Error Method: Error code : 53 Outdoor unit : No indication Drain pump Error Detective details: Detective Actuators: Indoor Unit Controller PCB Circuit When Float switch is ON for more than 3 minutes. Float Switch Forecast of C ause : 1.
  • Page 46 Trouble shooting 16 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor unit main PCB model Outdoor unit : No indication Error code : 62 information error Detective Actuators: Detective details: Access to EEPROM failed due to some cause after outdoor unit started. Outdoor unit Main PCB Forecast of Cause: 1.
  • Page 47 Indicate or Display: Trouble shooting 17 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 63 Inverter error Detective Actuators: Detective details: Outdoor unit Main PCB Error information received from Outdoor unit Main PCB Forecast of Cause : 1.
  • Page 48 Indicate or Display: Trouble shooting 18 OUTDOOR UNIT Error Method: INDOOR UNIT Outdoor unit : No indication Error code : 64 PFC circuit error Detective Actuators: Detective details: When inverter output DC voltage is higher than 420V for over 3 seconds, Outdoor unit Main PCB the compressor stops.
  • Page 49 Indicate or Display: Trouble shooting 19 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 65 Trip terminal L error Detective Actuators: Detective details: When the signal from FO terminal of IPM is "L"(=0V) Outdoor unit Main PCB while the compressor stops.
  • Page 50 Indicate or Display: Trouble shooting 20 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 71 Discharge Thermistor Error Detective Actuators: Detective details: Discharge temperature thermistor short detected Discharge temperature thermistor Discharge thermistor open detected Forecast of Cause : 1.
  • Page 51 Indicate or Display: Trouble shooting 21 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 72 Compressor Thermistor Error Detective Actuators: Detective details: Compressor temperature thermistor short detected Compressor temperature thermistor Compressor thermistor open detected Forecast of Cause : 1.
  • Page 52 Indicate or Display: Trouble shooting 22 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 73 Heat Ex. Outlet Temp. Thermistor Error Detective Actuators: Detective details: Heat exchanger liquid temperature Heat exchanger outlet temperature thermistor short or open detected thermistor Forecast of Cause : 1.
  • Page 53 Indicate or Display: Trouble shooting 23 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 74 Outdoor Thermistor Error Detective Actuators: Detective details: Outdoor temperature thermistor short or open detected Outdoor temperature thermistor Forecast of Cause : 1.
  • Page 54 Indicate or Display: Trouble shooting 24 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 77 Heat Sink Thermistor Error Detective Actuators: Detective details: Heat sink temperature thermistor (Built-in IPM) open/short detected Outdoor unit Main PCB Forecast of Cause : 1.
  • Page 55 Indicate or Display: Trouble shooting 25 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 84 Current sensor error Detective details: Detective Actuators: When Input Current Sensor has detected 0A, while Inverter Compressor is Outdoor unit Main PCB operating at higher than 56rps, after 1minute upon starting the Compressor.
  • Page 56 Indicate or Display: Trouble shooting 26 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 86 Pressure Sensor Error Detective Actuators: Detective details: High pressure switch When the power was turned on, "high pressure switch : open" was detected. Forecast of Cause : 1.
  • Page 57 Trouble shooting 27 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor unit : No indication Trip detection Error code : 94 Detective details: Detective Actuators: "Protection stop by overcurrent generation after inverter compressor start Outdoor unit Main PCB processing completed'' generated consecutively 10 times. Compressor * The number of generations is reset if the start-up of the compressor succeeds.
  • Page 58 Indicate or Display: Trouble shooting 28 OUTDOOR UNIT Error Method: Compressor rotor position Outdoor unit : No indication Error code : 95 detection error Detective details: Detective Actuators: While running the compressor, if the detected rotor location is out of Outdoor unit Main PCB phase with actual rotor location more than 105°, Compressor...
  • Page 59 Indicate or Display: Trouble shooting 29 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 97 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 60 Indicate or Display: Trouble shooting 30 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 99 4-Way Valve Error Detective Actuators: Detective details: When the indoor heat exchanger temperature is compared with Indoor Unit Controller PCB Circuit the room temperature, and either following condition is detected Heat Exchanger Temperature Thermistor continuously two times, the compressor stops.
  • Page 61 Trouble shooting 31 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor unit : No indication Discharge Temp. Error Error code : A1 Detective details: Detective Actuators: °C "Protection stop by "discharge temperature during compressor Discharge temperature thermistor operation'''' generated 2 times within 24 hours. Forecast of Cause : 1.
  • Page 62 Indicate or Display: Trouble shooting 32 OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : A3 Compressor Temp. Error Detective details: Detective Actuators: °C "Protection stop by "compressor temperature" during compressor Compressor temperature thermistor operation""generated 2 times within 24 hours Forecast of Cause : 1.

  • Page 63: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 33 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 64 Forecast of Cause: Trouble shooting 34 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 Installation Manual or Data &...
  • Page 65 Forecast of Cause: Trouble shooting 35 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 Control. Or, check if there is an open cable connection.
  • Page 66 Forecast of Cause: Trouble shooting 36 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 67 Forecast of Cause : Trouble shooting 37 1. Abnormal installation (Indoor/ Outdoor) Abnormal Noise 2. Fan failure (Indoor/ Outdoor) 3. Compressor failure (Outdoor) Diagnosis method when Abnormal Noise is occurred Abnormal noise is coming from Indoor Unit. Abnormal noise is coming from Outdoor Unit. (Check and correct followings) (Check and correct followings) Is Main Unit installed in stable condition?

  • Page 68: 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 Check if vibration noise by Is there open or loose connection Is there open or loose connection cable?
  • Page 69 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check Connection Check terminal connection of Compressor (loose or incorrect wiring) Main PCB Terminal cover opened T(W) R(U) (BLACK) (RED) S(V) (WHITE) BLACK WHITE Compressor Check Point 2 : Check Winding Resistance Check winding resistance of each terminal If the resistance value is 0 or infinite, replace Compressor.
  • Page 70 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 BLUE ORANGE CN40 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 71 SERVICE PARTS INFORMATION 4 Indoor 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 Indoor unit Fan Motor Refer to below.
  • Page 72 SERVICE PARTS INFORMATION 8 Thermistor Check Point : Check Thermistor resistance value Remove connector and check Thermistor resistance value. Temperature Resistance Value [ k ] [°C] Thermistor A Thermistor B Thermistor C Thermistor D - 20 105.4 - 10 27.8 27.4 58.2 20.7...
  • Page 73 3-3-17,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan Dec. 2015 Printed in Japan...

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