Fujitsu AO G12KATA Series Service Instruction
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Fujitsu AO G12KATA Series Service Instruction

Fujitsu AO G12KATA Series Service Instruction

Split type room air conditioner cassette type inverter
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SERVICE
INSTRUCTION
SPLIT TYPE
ROOM AIR CONDITIONER
Cassette
INVERTER
Models Indoor unit
AUXG09KVLA
AUXG12KVLA
AUXG14KVLA
AUXG18KVLA
AUXG22KVLA
RCG09KVLA
RCG12KVLA
RCG14KVLA
RCG18KVLA
RCG22KVLA
type
Outdoor unit
AO*G09KATA
AO*G12KATA
AO*G14KATA
AO*G18KATA
AO*G22KATA
ROG09KATA
ROG12KATA
ROG14KATA
ROG18KATA
ROG22KATA

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Summary of Contents for Fujitsu AO G12KATA Series

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER Cassette type INVERTER SERVICE INSTRUCTION Models Indoor unit Outdoor unit AO*G09KATA AUXG09KVLA AO*G12KATA AUXG12KVLA AUXG14KVLA AO*G14KATA AUXG18KVLA AO*G18KATA AO*G22KATA AUXG22KVLA ROG09KATA RCG09KVLA RCG12KVLA ROG12KATA RCG14KVLA ROG14KATA ROG18KATA RCG18KVLA ROG22KATA RCG22KVLA...

  • Page 2: Control And Functions

    1. CONTROL AND FUNCTIONS 2020.05.26 SR_CH04_AU007EF_01...

  • Page 3: Table Of Contents

    CONTENTS 1. CONTROL AND FUNCTIONS 1. Compressor frequency control..............04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-3 1-3. Dry operation ........................04-5 1-4. Compressor frequency at normal start-up ..............04-6 1-5. Compressor frequency limitation by outdoor temperature ..........04-7 2. Auto changeover operation................04-9 3.

  • Page 4: Compressor Frequency Control

    1. Compressor frequency control 1-1. Cooling operation 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. •...
  • Page 5 • Limit of maximum speed based on outdoor temperature Outdoor temperature rises Outdoor temperature drops 36°C A zone 34°C 32°C B zone 30°C 21°C C zone 19°C 12°C D zone 10°C 2°C E zone 0°C F zone Unit: rps Outdoor Indoor unit fan mode Model name temperature...

  • Page 6: Heating Operation

    1-2. Heating operation A sensor (room temperature thermistor) built in indoor unit body will usually perceive difference or variation between setting temperature and present room temperature, and controls operation fre- quency of compressor. • If the room temperature is 6.0 °C lower than a set temperature, the compressor operation frequen- cy will attain to maximum performance.
  • Page 7 • Limit of maximum speed based on outdoor temperature In heating operation, maximum frequency is defined by outdoor temperature and fan mode. Outdoor temperature rises Outdoor temperature drops C zone 14°C 12°C B zone -10°C -12°C A zone Unit: rps Outdoor Indoor unit fan mode Model name...

  • Page 8: Dry Operation

    1-3. Dry operation 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 has detected as shown in the table below. Zone is defined by set temperature and room temperature. •...

  • Page 9: Compressor Frequency At Normal Start-Up

    1-4. Compressor frequency at normal start-up ¢ Models: AOYG09KATA, AOYG12KATA, AOYG14KATA, and AOYG18KATA Compressor frequency soon after starting is controlled as below. Frequency VII Frequency VI Frequency V Frequency IV Frequency III Frequency II Frequency I Time 1 Time 2 Time 3 Time 4 Time 5...

  • Page 10: Compressor Frequency Limitation By Outdoor Temperature

    1-5. Compressor frequency limitation by outdoor temperature The minimum compressor frequency is limited by outdoor temperature as below. • Cooling/Dry mode F zone 38°C E zone 19°C D zone 10°C C zone 0°C B zone -10°C A zone Limitation of compressor Model name Outdoor temperature zone frequency...
  • Page 11 • Heating mode F zone 19°C E zone 5°C D zone 0°C C zone -15°C B zone -25°C A zone Limitation of compressor Model name Outdoor temperature zone frequency A zone 43 rps B zone 43 rps C zone 30 rps AOYG09KATA D zone 18 rps...

  • Page 12: Auto Changeover Operation

    2. Auto changeover operation When the air conditioner is set to AUTO mode by remote controller, operation starts in the optimum mode from among heating, cooling, dry and monitoring modes. During operation, the optimum mode is automatically switched in accordance with temperature changes. The temperature can be set be- tween 18°C and 30°C in 1.0°C steps.
  • Page 13 Operation flow chart Start Ts: Setting temperarure 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? Thermostat remains...

  • Page 14: Fan Control

    3. Fan control Tr: Room temperature Ts: Setting temperature 3-1. Indoor fan control ¢ Fan speed Indoor fan speed is defined as below. Speed (rpm) Operation mode Fan mode HIGH MED+ Heating QUIET Cool air prevention S-LOW HIGH Cooling/Fan QUIET Soft quiet 400* 400*...
  • Page 15 ¢ Dry operation During dry operation, fan speed setting can not be changed as shown in “Fan speed” above. ¢ Heating operation Switch the airflow AUTO, and the indoor fan motor will run according to a room temperature, as be- low.
  • Page 16 • Powerful operation Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C 37°C HIGH 39°C 34°C or setting fan mode* 37°C 32°C Cool air prevention 30°C 24°C S-LOW 13 minutes later: Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C...

  • Page 17: Outdoor Fan Control

    3-2. Outdoor fan control ¢ Outdoor fan motor This outdoor unit has a DC fan motor. (Control method is different between AC and DC motors.) ¢ Fan speed  Model: AOYG09KATA Fan speed is defined by outdoor temperature and compressor frequency. •...
  • Page 18  Model: AOYG12KATA Fan speed is defined by outdoor temperature and compressor frequency. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 21°C 19°C Z zone 12°C 10°C F zone 2°C 0°C G zone -8°C -10°C H zone...
  • Page 19  Model: AOYG14KATA Fan speed is defined by outdoor temperature and compressor frequency. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 21°C 19°C Z zone 12°C 10°C F zone 2°C 0°C G zone -8°C -10°C H zone...
  • Page 20  Model: AOYG18KATA Fan speed is defined by outdoor temperature and compressor frequency. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 21°C 19°C Z zone 12°C 10°C F zone 2°C 0°C G zone -8°C -10°C H zone...
  • Page 21  Model: AOYG22KATA Fan speed is defined by outdoor temperature and compressor frequency. • Outside air temperature zone selection Outside air Outside air temperature rises temperature drops Y zone 21°C 19°C Z zone 12°C 10°C F zone 2°C 0°C G zone -8°C -10°C H zone...

  • Page 22: Louver Control

    4. Louver control 4-1. Individual louver control To independently can be set the airflow pattern of each louver as follows: This function is given priority to overall louver control. But this function is release during the following operation. • Cold air prevention control •...

  • Page 23: Swing Operation

    4-3. Swing operation • To select vertical airflow swing operation When the swing signal is received, the vertical airflow direction louver starts to swing. – Swinging range • Cooling mode/dry mode/fan mode: 1 ↔ 4 • Heating mode: 1 ↔ 4 –...

  • Page 24: Timer Operation Control

    5. Timer operation control 5-1. Wireless remote control On/Off timer Program timer Sleep timer Weekly timer ○ ○ ○ — ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 25 ¢ Sleep timer If the sleep timer is set, the room temperature is monitored and the operation is stopped auto- matically. 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. •...

  • Page 26: Wired Remote Control

    5-2. Wired remote control Temperature set On/Off timer Program timer Sleep timer Weekly timer back timer ○ ○ ○ ○ ○ ¢ On/Off timer • Off timer: When the clock reaches the set timer, the air conditioner will be turned off. Operation mode Stop mode Set time of timer...
  • Page 27 ¢ Sleep timer If the sleep timer is set, the room temperature is monitored and the operation is stopped auto- matically. 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. •...
  • Page 28 ¢ Temperature set back timer • The SET BACK timer only changes the set temperature for 7 days, it cannot be used to start or stop air conditioner operation. • The SET BACK timer can be set to operate up to two times per day but only one temperature setting can be used.

  • Page 29: Defrost Operation Control

    6. Defrost operation control Tn: Outdoor unit heat exchanger temperature Ta: Outdoor temperature Tn10: Temperature at 10 minutes after compressor start Tnb: Temperature before 5 minutes Triggering condition • The defrost operation starts when outdoor unit heat exchanger temperature sensor detects the temperature lower than the values shown below.

  • Page 30: Defrost Operation In Heating Operation Stopped

    6-1. Defrost operation in heating operation stopped If the outdoor unit is frosted when stopping the heating operation, it stops after performing the auto- matic defrosting operation. In this time, if the indoor unit operation lamp flashes slowly (6 sec on/2 sec off), the outdoor unit al- low the heat exchanger to defrost, and then stop.

  • Page 31: Various Control

    7. Various control 7-1. Auto restart When the power was interrupted by a power failure etc. during operation, the operation contents at that time are memorized and when the power is recovered, operation is automatically started with the memorized operation contents. Operation contents memorized when the power is interrupted Operation mode Setting temperature...

  • Page 32: Powerful Operation

    7-4. POWERFUL operation The POWERFUL operation starts by pressing POWERFUL button on the remote controller. The indoor unit and outdoor unit operate at maximum power as shown in the table below. Compressor frequency Maximum Fan mode POWERFUL Cooling Vertical airflow direction louver setting Heating Release condition:...

  • Page 33: External Electrical Heater Control

    7-7. External electrical heater control The external electrical heater is operated as below. When the room Ts: Setting temperature temperature rises Heater : Off Ts -1°C Ts -3°C Heater : On Ts -10°C Ts -12°C Heater : Off When the room temperature drops NOTES: •...

  • Page 34: Drain Pump Control

    7-9. Drain pump control ¢ Drain control for dehumidification operation  During cooling or dry mode • When the compressor starts, the drain pump starts simultaneously. • The drain pump operates continuously for 3 minutes after the compressor is turned off. Compressor Drain pump 3 minutes...

  • Page 35: Prevention To Restart For 3 Minutes (3 Minutes St)

     During heating mode or fan mode and when operation is stopped • Triggering condition Drain pump is turned on at the same time that the float switch is turned on. • Operation details When the float switch turns on continuously for 3 minutes, "failure indication" operates. There- after, even if the float switch turns off, the "failure indication"...

  • Page 36: Various Protections

    8. Various protections 8-1. Discharge gas temperature over-rise prevention control The discharge gas temperature sensor (discharge thermistor: outdoor unit side) detects the dis- charge gas temperature. • When the discharge temperature becomes higher than the trigger condition, the compressor fre- quency is decreased as the table below, and it continues to decrease until the discharge tempera- ture becomes lower than the trigger condition.

  • Page 37: Current Release Control

    8-3. Current release control The compressor frequency is controlled so that the outdoor unit input current does not exceeds cur- rent limit value set according to the outdoor temperature. The compressor frequency returns according to the operation mode, when the current becomes low- er than the release value.

  • Page 38: Indoor Unit Fan Motor Over Temperature Protection

    ¢ Model: AOYG18KATA Operation mode Outdoor temp. (Ta) Trigger condition Release condition 50°C ≤ Ta 4.0 A 3.5 A 46°C ≤ Ta < 50°C 4.5 A 4.0 A 40°C ≤ Ta < 46°C 6.0 A 5.5 A Cooling 12°C ≤ Ta < 40°C 8.5 A 8.0 A 2°C ≤...

  • Page 39: Compressor Temperature Protection

    8-5. Compressor temperature protection When the compressor temperature sensor detects higher than the trigger condition below, the com- pressor is stopped. When the compressor temperature sensor detects the release condition, the pro- tection is released. Trigger condition 108°C 80°C Release condition (3 minutes after compressor stop) 8-6.

  • Page 40: High Temperature And High Pressure Release Control

    8-8. High temperature and high pressure release control The compressor is controlled as follows. ¢ Models: AOYG09KATA, AOYG12KATA, AOYG14KATA, AOYG18KATA, and AOYG22KATA • Cooling mode Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 61°C Zone A 60°C 59°C Zone B...
  • Page 41 CASSETTE type INVERTER 2 . TROUBLE SHOOTING...
  • Page 42 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 43 2-2 TROUBLE SHOOTING WITH ERROR CODE Indicate or Display: Trouble shooting 1 OUTDOOR UNIT Error Method: Error code : 11 Outdoor unit : No indication 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 44 Indicate or Display: Trouble shooting 2 INDOOR UNIT Error Method: Error code : 11 Outdoor unit : No indication Serial communication error (Serial Forward Transfer Error) Detective details: Detective Actuators: When the outdoor unit cannot properly receive the serial signal from Indoor unit Controller PCB indoor unit for 10 seconds or more.
  • Page 45 Indicate or Display: Trouble shooting 3 INDOOR UNIT Error Method: Error code : 12 Outdoor unit : No indication Wired Remote Controller Communication Error Detective details: Detective Actuators: Upon receiving the signal more than 1 time from Wired Remote or other Indoor Indoor unit Controller PCB unit, but the same signal has not been received more than 1 minute Wired Remote Controller...
  • Page 46 Indicate or Display: Trouble shooting 5 INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 18 External communication error Detective Actuators: Detective details: After receiving a signal from the external I/O PCB, External communication error the same a signal has not been received for 15sec Forecast of Cause : 1.
  • Page 47 Trouble shooting 6 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 Indoor unit information from Indoor unit. When the refrigerant is R410a. 2.
  • Page 48 Trouble shooting 7 Indicate or Display: INDOOR UNIT Error Method: Outdoor unit : No indication Error code : 26 Indoor unit address setting error Detective Actuators: Detective details: When the address number set by auto setting and manual setting are Wired remote controller ( 2-Wire ) mixed in one RC group.
  • Page 49 Trouble shooting 8 Indicate or Display: INDOOR UNIT Error Method: Connection unit number error (Indoor Outdoor unit : No indication Error code : 29 unit in Wired remote controller system) Detective Actuators: Detective details: Wired remote controller ( 2-Wire ) When the number of connecting indoor units are out of specified rule.
  • Page 50 Trouble shooting 9 Indicate or Display: INDOOR UNIT Error Method: Error code : 32 Outdoor unit : No indication 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.
  • Page 51 Trouble shooting 10 Indicate or Display: INDOOR UNIT Error Method: Error code : 33 Outdoor unit : No indication Indoor unit motor electricity consumption detection error Detective Actuators: Detective details: Indoor unit fan motor When the voltage value or the current value of the motor go beyond the limits. Indoor unit Controller PCB circuit Forecast of Cause: 1.
  • Page 52 Trouble shooting 11 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 Indicator PCB for consecutive 60 or more seconds.
  • Page 53 Trouble shooting 12 Indicate or Display: INDOOR UNIT Error Method: Error code : 39 Outdoor unit : No indication Indoor unit power supply error for fan motor Detective Actuators: Detective details: Indoor unit Power Supply PCB When a momentary power cut off. When do not start fan motor.
  • Page 54 Trouble shooting 13 Indicate or Display: INDOOR UNIT Error Method: Indoor unit Communication circuit Outdoor unit : No indication Error code : 3A (wired remote controller) error Detective Actuators: Detective details: Indoor unit Controller PCB circuit Detect the communication error of microcomputer and communication PCB. Forecast of Cause : 1.Communication PCB defective 2.
  • Page 55 Trouble shooting 14 Indicate or Display: 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 56 Trouble shooting 15 Indicate or Display: INDOOR UNIT Error Method: Error code : 42 Outdoor unit : No indication Indoor Heat Ex. Thermistor Error Detective details: Detective Actuators: Indoor unit Controller PCB Circuit Indoor unit thermistor is open or short is detected always. Heat Exchanger (MID) Thermistor Forecast of Cause : 1.
  • Page 57 Trouble shooting 16 Indicate or Display: 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 for 56 seconds.
  • Page 58 Indicate or Display: Trouble shooting 17 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 Cause : 1.
  • Page 59 Trouble shooting 18 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 60 Trouble shooting 19 Indicate or Display: OUTDOOR UNIT Error Method: Error code : 63 Outdoor unit : No indication Inverter error Detective Actuators: Detective details: Outdoor unit Main PCB Error information received from Outdoor unit Main PCB Forecast of Cause : 1.
  • Page 61 Indicate or Display: Trouble shooting 20 OUTDOOR UNIT Error Method: 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 62 Trouble shooting 21 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor unit : No indication Error code : 65 Trip terminal L error Detective Actuators: Detective details: Outdoor unit Main PCB When the signal from FO terminal of IPM is "L"(=0V) while the compressor stops.
  • Page 63 Trouble shooting 22 Indicate or Display: OUTDOOR UNIT Error Method: Error code : 71 Outdoor unit : No indication Discharge Thermistor Error Detective Actuators: Detective details: Discharge temperature thermistor Discharge temperature thermistor short or open detected Forecast of Cause : 1.
  • Page 64 Trouble shooting 24 Indicate or Display: OUTDOOR UNIT Error Method: Error code : 73 Outdoor unit : No indication Heat Ex. Outlet / Middle Temp. Thermistor Error Detective Actuators: Detective details: Heat exchanger Outlet / Middle temperature Heat exchanger outlet temperature thermistor short or open detected thermistor Heat exchanger middle temperature thermistor short or open detected Forecast of Cause :...
  • Page 65 Trouble shooting 25 Indicate or Display: OUTDOOR UNIT Error Method: Error code : 74 Outdoor unit : No indication Outdoor Thermistor Error Detective Actuators: Detective details: Outdoor temperature thermistor Outdoor temperature thermistor short or open detected Forecast of Cause : 1.
  • Page 66 Trouble shooting 27 Indicate or Display: OUTDOOR UNIT Error Method: Error code : 84 Outdoor unit : No indication Current sensor error Detective Actuators: Detective details: 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 67 Trouble shooting 29 Indicate or Display: OUTDOOR UNIT Error Method: Error code : 94 Outdoor unit : No indication Trip detection 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 68 Trouble shooting 30 Indicate or Display: OUTDOOR UNIT Error Method: Compressor rotor position Outdoor unit : No indication Error code : 95 detection error Detective details: Detective Actuators: Outdoor unit Main PCB "Protection stop by "overcurrent generation at inverter compressor starting" Compressor restart"...
  • Page 69 Indicate or Display: Trouble shooting 31 OUTDOOR UNIT Error Method: Error code : 97 Outdoor unit : No indication 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 70 Indicate or Display: Trouble shooting 32 OUTDOOR UNIT Error Method: Error code : 99 Outdoor unit : No indication 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 71 Trouble shooting 33 Indicate or Display: OUTDOOR UNIT Error Method: Error code : A1 Outdoor unit : No indication Discharge Temp. Error Detective Actuators: Detective details: °C "Protection stop by "discharge temperature during compressor Discharge temperature thermistor operation'''' generated 2 times within 24 hours. Forecast of Cause : 1.
  • Page 72 2-3 TROUBLESHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 34 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. >>If abnormal condition is found, correct it by referring to Installation Manual or Data &...
  • Page 73 Forecast of Cause: Trouble shooting 35 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 74 Trouble shooting 36 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 Control. Or, check if there is an open cable connection.
  • Page 75 Forecast of Cause: Trouble shooting 37 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 76 Forecast of Cause : Trouble shooting 38 1. Abnormal installation (Indoor/ Outdoor) 2. Fan failure (Indoor/ Outdoor) Abnormal Noise 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 77 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 78 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check Connection Check terminal connection of Compressor (loose or incorrect wiring) Terminal cover opened Main PCB W(C) U(R) (BLACK) (RED) W400 W401 W402 V(S) (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 79 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 YELLOW WHITE Check Point 2 : Check Coil of EEV Check Point 3 : Check Noise at start up Remove connector, check each winding Turn on Power and check operation noise.
  • Page 80 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 81 SERVICE PARTS INFORMATION 8 Thermistor Check Point : Check Thermistor resistance value Remove connector and check Thermistor resistance value. Resistance Value [ k ] Temperature [°C] Thermistor A Thermistor B Thermistor C 1013.1 95.6 224.3 531.6 50.3 115.2 292.9 27.8 62.3 168.6 16.1...
  • Page 82 3-3-17,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan May. 2020 Printed in Japan...

This manual is also suitable for:

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