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Fujitsu AU A36LCLU Series Service Instruction

3 phase type room air conditioner
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SERVICE
INSTRUCTION
R410A
3 PHASE TYPE
ROOM AIR CONDITIONER
Single /
Simultaneous
operation multi type
Models
Indoor unit
Single type
AU*A36LCLU
AU*A45LCLU
AU*A54LCLU
AR*A36LCTU
AR*A45LCTU
AR*C45LCTU
AR*C54LCTU
AB*A36LCT
AB*A45LCT
AB*A54LCT
Simultaneous
operation multi type
AU*F18LBL
AU*F22LBL
AU*F24LBL
AR*F18LBTU
AR*F22LBTU
AR*F24LBTU
AB*F18LBT
AB*F22LBT
AB*F24LBT
Outdoor unit
AO* D36LATT
AO* D45LATT
AO* D54LATT
AOTD60LATT

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Summary of Contents for Fujitsu AU A36LCLU Series

  • Page 1 3 PHASE TYPE ROOM AIR CONDITIONER Single / Simultaneous operation multi type SERVICE INSTRUCTION Models Indoor unit Outdoor unit Single type AO* D36LATT AU*A36LCLU AO* D45LATT AU*A45LCLU AO* D54LATT AU*A54LCLU AOTD60LATT AR*A36LCTU AR*A45LCTU AR*C45LCTU AR*C54LCTU R410A AB*A36LCT AB*A45LCT AB*A54LCT Simultaneous operation multi type AU*F18LBL AU*F22LBL...

  • Page 2: Table Of Contents

    CONTENTS 1. DESCRIPTION OF EACH CONTROL OPERATION 1-1 COOLING OPERATION.................... 01-01 1-1-1 COOLING CAPACITY CONTROL..............01-01 1-2 HEATING OPERATION.................... 01-02 1-2-1 HEATING CAPACITY CONTROL..............01-02 1-3 DRY OPERATION..................... 01-03 1-3-1 INDOOR UNIT CONTROL................. 01-03 1-4 AUTO CHANGEOVER OPERATION................ 01-04 1-5 INDOOR FAN CONTROL..................01-05 1-6 OUTDOOR FAN CONTROL..................
  • Page 3 2. TROUBLE SHOOTING 2-1 ERROR DISPLAY...................... 02-01 02-01 2-1-1 INDOOR UNIT DISPLAY..................2-1-2 OUTDOOR UNIT DISPLAY................02-02 2-1-3 WIRED REMOTE CONTROLLER DISPLAY............02-03 2-2 TROUBLE SHOOTING WITH ERROR CODE............02-04 2-3 TROUBLE SHOOTING WITH NO ERROR CODE............ 02-38 2-4 SERVICE PARTS INFORMATION................02-43 3.

  • Page 4: Description Of Each Control Operation

    AIR CONDITIONER 3 phase type Single / Simultaneous operation multi type 1 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 5: 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 6: Heating Operation

    1-2. HEATING OPERATION 1-2-1 HEATING 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 2 based on the outdoor temperature. If the room temperature is lower 3 °C than a set temperature, the compressor operation frequency will attain to maximum frequency.

  • Page 7: 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 3. ( Table 3 : Compressor Frequency Range ) [ Hz ] Frequency Recital...

  • Page 8: Auto Changeover Operation

    1-4. 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 and MONITORING modes. 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 9: Indoor Fan Control

    1-5. INDOOR FAN CONTROL 1. Fan speed ( Table 5 : Indoor Fan Speed ) AU *F18LBL AB *F18LBT AR *F18LBLU Operation mode Air flow mode Speed (rpm) Operation mode Air flow mode Speed (rpm) Operation mode Air flow mode Speed (rpm) COOLING COOLING COOLING...
  • Page 10 2. FAN OPERATION The airflow can be switched in 5 steps such as AUTO, QU, 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 Switch the airflow [AUTO], and the indoor fan motor will run according to a room temperature, as shown in Figure 8.
  • Page 11 5. COOL AIR PREVENTION CONTROL (HEATING mode) When the compressor operates, the maximum value of the indoor fan speed is set as shown in Figure 10, 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 about 300rpm.

  • Page 12: 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 Upper fan 850/ 780/ 520/ 480/ 400/ 350/ 280 rpm AO *D36LATT Lower fan 800/ 750/ 520/ 350/ 280/ 0 rpm Upper fan...

  • Page 13: Louver Control

    1-7. LOUVER CONTROL AB *F18/ 22/ 24LBT > 1. For Floor / Ceiling Type < (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 11 : Air Direction Range) (Operation Range) During COOLING / HEATING / DRY / FAN mode : Use the air direction adjustments within the ranges shown above.
  • Page 14 (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 12 : 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 15 AB *A36/ 45/ 54LCT > 2. For Ceiling Type < (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 13 : Air Direction Range) (Operation Range) During COOLING / HEATING / DRY / FAN mode : Use the air direction adjustments within the ranges shown above.
  • Page 16 (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 14 : 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 17 AU *F18/ 22/ 24LBL > 3. For Compact Cassette Type < (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 / HEATING / DRY / FAN mode : Use the air direction adjustments within the ranges shown above.
  • Page 18 AU *A36/ 45/ 54LCLU > 4. For Cassette Type < (Function Range) Each time the button is pressed, the air direction range will change as follows: (Fig 16 : Air Direction Range) (Operation Range) During COOLING / HEATING / DRY / FAN mode : Use the air direction adjustments within the ranges shown above.

  • Page 19: 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 22. (Table 22 : Compressor Operation Frequency Range) COOLING HEATING indoor unit indoor unit 30Hz 36Hz 42Hz AO *D36LATT 110Hz...

  • Page 20: Timer Operation Control

    1-9. TIMER OPERATION CONTROL 1-9-1 Wireless Remote Controller AR-SY1 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 21 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 22: Wired Remote Controller

    1-9-2 Wired Remote Controller AR-6TC1 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 ON timer : When the clock reaches the set time, the air conditioner will be turned on.
  • Page 23 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 24: 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 25: 4-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 26: 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 27: Compressor Preheating

    1-17. COMPRESSOR PREHEATING When the outdoor heat exchanger temperature is lower than -5°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 -3°C or greater, preheating is ended.
  • Page 28 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 1st defrost) (In case of 2nd and later defrost) Compressor integrating Compressor integrating Compressor integrating...

  • Page 29: 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 30: Economy Operation

    1-20. ECONOMY OPERATION At the maximum output, ECONOMY OPERATION is approximately 70% of normal air conditioner operation for COOLING and HEATING. When ECONOMY OPERATION is performed during the COOLING mode, dehumidification is improved. This function is especially convenient when you want to remove the humidity in the room without significantly lowering the room temperature.
  • Page 31 4. PRESSURE OVER RISE PROTECTION <COOLING mode> When the outdoor unit heat-exchange temperature rises to temperature or greater, the compressor is stopped and trouble display is performed. After 3 minutes ST, release of protection. 5. ANTI FREEZING PROTECTION <COOLING / DRY mode> The compressor frequency is decrease on COOLING and DRY mode when the indoor heat exchanger temperature sensor detects the temperature lower than Temperature .
  • Page 32 6-2. HIGH TEMPERATURE RELEASE CONTROL <Outdoor unit control> When the indoor unit heat-exchanger temperature becomes more than 65°C, the compressor is stopped. After 3 minutes ST and the heat-exchanger temperature becomes 50°C, this protection is released. When the heat-exchanger temperature becomes more than 57°C, the compressor frequency -10Hz. <After the compressor frequency -10Hz and 1 minute has passed>...

  • Page 33: Forced Cooling Operation

    1-22. 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 34: Drain Pump Operation

    1-26. 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. 3. When the compressor stops by the "Anti- freezing protection", the drain pump is turned off in 1 hour after the compressor stops.

  • Page 35: Low Noise Operation

    1-27. 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 36: Description Of Display Unit

    1-29. DESCRIPTION OF DISPLAY UNIT 1-29-1 Layout of Display Unit 1-00. ERROR HISTORY MODE 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)

  • Page 37: Display Mode

    1-29-2 Display mode 1-00. ERROR HISTORY MODE In this mode, the "Operation Condition" and "Error Code" can be displayed by Push Switch on outdoor unit PCB • (Table :17 Display pattern ) : Light OFF : Light ON n : n Time Blinking Power / Mode Display Item L1 L2 L3 L4...
  • Page 38 : Light OFF : Light ON 1 : 1 Time Blinking (Table 19 : Detail of LED Display Data) Power Error Item No, Display Item Mode Compressor 1 ~ 15 Frequency 16 ~ 30 ( 0 ~ 95rps ) 31 ~ 45 46 ~ 60 61 ~ 75 76 ~ 90...
  • Page 39 : Light OFF : Light ON 1 : 1 Time Blinking Power Error Item No, Display Item Mode ~ -15 Outdoor Air -15 ~ -5 Temperature -5 ~ 5 ° ( -30 ~ 70 5 ~ 15 15 ~ 25 25 ~ 35 35 ~ 45 45 ~...

  • Page 40: Error Check Mode

    1-29-3 Error history mode 1-00. ERROR HISTORY MODE In this mode, the history of abnormality that occurred in the past can be confirmed. • n : n Times Blinking (Table : 20 Procedure for History Mode ) : Light OFF : Light ON : Blinking 2 : 2 Times Blinking...
  • Page 41 AIR CONDITIONER 3 phase type Single / Simultaneous operation multi type 2. TROUBLE SHOOTING...
  • Page 42 2. TROUBLE SHOOTING 2-1 ERROR DISPLAY 2-1-1 INDOOR UNIT DISPLAY 1. ERROR DISPLAY Please refer the blinking pattern as follows. Indoor Unit : AB*F18 - 24LBT, AB*A36 - 54LCT, AU*F18 - 24LBL, AU*A36 - 54LCLU The OPERATION, TIMER, FILTER lamps operate as follows according to the error contents. Error display Trouble Error contents...
  • Page 43 2-1-2 OUTDOOR UNIT DISPLAY Please refer the blinking pattern as follows. Outdoor Unit : AO*D36 - 54LATT 1. MAIN PCB The Error LED operate as follows according to the error contents. Trouble Error contents Error LED shooting Serial error (Serial forward transfer error) 1 times flash Outdoor discharge pipe temperature thermistor error 2 times flash...
  • Page 44 2-1-3 WIRED REMOTE CONTROLLER DISPLAY The Error code operate as follows according to the error contents. Indoor Unit : AR*A18LBLU, AR*A22 - 24LBTU, AR*A36 - 45LCTU, AR*C36 - 54LCTU Trouble Error code Error contents shooting Wired remote controller error Serial error (Serial reverse transfer error) Room temperature thermistor error Indoor heat exchanger temperature thermistor (Middle) error Outdoor heat exchanger temperature thermistor (Out) error...
  • Page 45 2-2 TROUBLE SHOOTING WITH ERROR CODE Trouble shooting 1 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Serial Error (Serial Reverse Transfer Error) Detective Actuators: Detective details: When the indoor unit cannot properly receive the serial signal from Outdoor Unit Main PCB outdoor unit for 10 seconds or more.
  • Page 46 Trouble shooting 2 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Serial 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 47: Wired Remote Controller Error

    Trouble shooting 3 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Wired Remote Controller 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 48: Room Temperature Thermistor Error

    Trouble shooting 4 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Room Temperature Thermistor 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 49: Indoor Heat Exchanger Temperature Thermistor (Middle) Error

    Trouble shooting 5 Indicate or Display: INDOOR UNIT Error Method: Indoor Heat Exchanger Temperature Refer to error code table. Thermistor (Middle) 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 50: Water Drain Error

    Trouble shooting 6 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Water Drain 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 51 Trouble shooting 7 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Discharge Pipe Temperature Thermistor 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.
  • Page 52 Trouble shooting 8 Indicate or Display: OUTDOOR UNIT Error Method: Outdoor Heat Exchanger Temperature Refer to error code table. Thermistor (Out) Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Heat Exchanger Temperature Thermistor (Out) open or Heat Exchanger Temperature Thermistor (Out) short-circuit is detected at power ON or while running the compressor.

  • Page 53: Outdoor Temperature Thermistor Error

    Trouble shooting 9 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Temperature Thermistor 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 54: Heat Sink Thermistor (Inv) Error

    Trouble shooting 10 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Heat Sink Thermistor (INV) Error Detective Actuators: Detective details: Outdoor Unit Inverter PCB When Heat Sink Temperature Thermistor (INV) open or Heat Sink Temperature Thermistor (INV) short-circuit is detected at power ON or while running the compressor.
  • Page 55 Trouble shooting 11 Indicate or Display: OUTDOOR UNIT Error Method: Compressor Thermistor 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 56 Trouble shooting 12 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Heat Exchanger Temperature Thermistor (Middle) Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Heat Exchanger Temperature Thermistor (Middle) open or Heat Exchanger Temperature Thermistor (Middle) short-circuit is detected at power ON or while running the compressor.
  • Page 57 Trouble shooting 13 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Heat Sink Thermistor (PFC) Error Detective Actuators: Detective details: Outdoor Unit Main PCB When Compressor Temperature Thermistor (PFC) open or Heat Sink Temperature Thermistor (PFC) short-circuit is detected at power ON or while running the compressor.
  • Page 58 Trouble shooting 14 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 30 or Indicator PCB more seconds.

  • Page 59: Over Current Protection

    Trouble shooting 15 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Over Current Protection 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 60: Ct Error

    Trouble shooting 16 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. CT 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 61 Trouble shooting 17 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor Start-up Error Detective Actuators: Detective details: Start indication goes from Main PCB to Inverter PCB. Outdoor Unit Inverter PCB But, if the compressor does not start for the below cause, each treatments are done.

  • Page 62: Outdoor Unit Fan Error

    Trouble shooting 18 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Unit Fan 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. Outdoor Fan Motor After fan motor restarts, if the same operation within 60sec is repeated consecutively 3 times, compressor and fan motor stops.

  • Page 63: Connected Indoor Unit Error

    Trouble shooting 19 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Connected Indoor Unit 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 64 Trouble shooting 20 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. INV 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 65 Trouble shooting 21 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Fan Motor Lock Error Indoor Fan Motor Rev. 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 66 Trouble shooting 22 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge Temperature 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 67 Trouble shooting 23 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Excessive High Pressure Protection On Cooling Detective Actuators: Detective details: Outdoor Unit Main PCB In cooling operation, after 1 minute or more compressor starts, when outdoor heat exchanger temperature is 68 °C and above. Outdoor Fan Motor Heat Exchanger Temp.
  • Page 68 Trouble shooting 24 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Pressure SW (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 69: Compressor Tenperature Error

    Trouble shooting 25 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor Temperature Error Detective Actuators: Detective details: Outdoor Unit Main PCB When the compressor temperature becomes 112°C or more. Compressor Temperature Thermistor Forecast of Cause : 1.

  • Page 70: Low Pressure Error

    Trouble shooting 26 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 state-up, Outdoor Unit Main PCB when pressure sensor detects 0.12 MPa or less for consecutive Pressure Sensor 5 minutes.
  • Page 71 Trouble shooting 27 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. PFC PCB 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 72: Refrigerant Circuit Address Set-Up Error

    Trouble shooting 28 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Refrigerant Circuit Address Set-up Error Detective Actuators: Detective details: When the addresses set in indoor units are not consecutive Indoor Unit Controller PCB in the same refrigerant circuit. Forecast of Cause : 1.

  • Page 73: Master Unit, Slave Unit Set-Up Error

    Trouble shooting 29 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Master Unit, Slave Unit Set-up 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 74: Number Of Connected Indoor Unit Error

    Trouble shooting 30 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Number of Connected Indoor Unit Error Detective Actuators: Detective details: Indoor Unit When there are 4 or more indoor units in the same refrigerant system. Forecast of Cause : 1.
  • Page 75 Trouble shooting 31 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Model Distinction Error (Indoor) 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 76 Trouble shooting 32 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Power Supply Frequency Detection Error Detective Actuators: Detective details: Indoor Unit Controller PCB When power frequency is not detected by 4 seconds after power-on. Indoor Unit Power PCB Forecast of Cause: 1.
  • Page 77 Trouble shooting 33 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor Location Detection Error 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 78 Trouble shooting 34 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Active Filter Error Detective Actuators: Detective details: Outdoor Unit Inverter PCB Inverter low voltage protection Outdoor Unit PFC PCB Inverter overvoltage protection Forecast of Cause : 1.
  • Page 79 2-3 TROUBLE SHOOTING WITH NO ERROR CODE Trouble shooting 35 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 36 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 37 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 38 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 39 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 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 Is there open or loose connection Check if vibration noise by 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 (RED) (BLACK) BLACK TM805 Inverter PCB Inverter PCB TM804 WHITE (WHITE) Compressor...
  • 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 ) BROWN BLUE EXPANSION VALVE COIL ORANGE CN17 YELLOW WHITE Check Point 2 : Check coil of EEV Check Point 3 : Check voltage from Main PCB.
  • Page 87 Check Point 5 : Check opening and closing operation of valve When valve is closed, If it is open, it has no temp. difference between inlet and outlet. it has a temp. difference between Inlet and outlet. CLOSE OPEN Example : Hot gas Example : Hot gas Pipe (In) Pipe (In)
  • Page 88 AIR CONDITIONER 3 phase type Single / Simultaneous operation multi type 3. DISASSEMBLY PROCESS...
  • Page 92 4-4. 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 98 15. 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 99 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan July. 2009 Printed in Japan...

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