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Fujitsu ARU7RLF Service Instruction
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Fujitsu ARU7RLF Service Instruction

Slim duct / compact cassette compact wall mounted / wall mounted / floor
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SERVICE
INSTRUCTION
R410A
SPLIT TYPE
ROOM AIR CONDITIONER
Slim Duct / Compact Cassette
Compact Wall Mounted /
Wall Mounted / Floor
INVERTER MULTI
Models
Indoor unit
ARU7RLF
ARU9RLF
ARU12RLF
ARU18RLF
ARU24RLF
AUU7RLF
AUU9RLF
AUU12RLF
AUU18RLF
ASU7RLF
ASU9RLF
ASU12RLF
ASU18RLF
ASU24RLF
ASU9RLS2
ASU12RLS2
ASU15RLS2
ASU7RLF1
ASU9RLF1
ASU12RLF1
ASU15RLF1
AGU9RLF
AGU12RLF
AGU15RLF
Outdoor unit
AOU18RLXFZ
AOU24RLXFZ
AOU36RLXFZ

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Summary of Contents for Fujitsu ARU7RLF

  • Page 1 SPLIT TYPE ROOM AIR CONDITIONER Slim Duct / Compact Cassette Compact Wall Mounted / Wall Mounted / Floor INVERTER MULTI SERVICE INSTRUCTION Models Indoor unit Outdoor unit ARU7RLF AOU18RLXFZ ARU9RLF AOU24RLXFZ ARU12RLF AOU36RLXFZ ARU18RLF ARU24RLF AUU7RLF AUU9RLF AUU12RLF AUU18RLF R410A...

  • Page 2: Table Of Contents

    CONTENTS 1. DESCRIPTION OF EACH CONTROL OPERATION 1. CAPACITY CONTROL....................01-01 2. AUTO CHANGEOVER OPERATION................01-01 3. INDOOR FAN CONTROL................... 01-03 4. LOUVER CONTROL....................01-11 5. OUTDOOR FAN CONTROL..................01-16 6. TIMER OPERATION CONTROL................01-17 7. COMPRESSOR CONTROL..................01-20 8. ELECTRONIC EXPANSION VALVE CONTROL............01-21 9.

  • Page 3: Description Of Each Control Operation

    R410A Slim Duct / Compact Cassette Compact Wall Mounted / Wall Mounted / Floor type INVERTER (MULTI ) 1 . DESCRIPTION OF EACH CONTROL OPERATION...

  • Page 4: Capacity Control

    1. CAPACITY CONTROL 1-1 COOLING, HEATING, DRY CAPACITY CONTROL Compressor frequency decides by capacity of an indoor unit, operation number of an indoor unit, set temperature, room temperature and outside temperature. 2. 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.
  • Page 5 When Heating was selected at , the same operation as HEATING OPERATION of page 01-02 is performed. When the compressor was stopped for 6 consecutive minutes by the temperature control function after the Cooling(Auto:Dry) or Heating mode was selected at above, operation is switched to Monitoring and the operation mode is selected again.

  • Page 6: Indoor Fan Control

    3. INDOOR FAN CONTROL 1. Fan speed ( Table 2 : Indoor fan speed table) (rpm) (rpm) ASU7RLF ASU9RLF Operation mode Fan Speed Operation mode Fan Speed Air flow mode Air flow mode Heating Heating 1050 1100 1000 1040 Quiet Quiet Cool Air Prevention Cool Air Prevention...
  • Page 7 (rpm) (rpm) AUU7RLF AUU9RLF Operation mode Air flow mode Fan Speed Operation mode Fan Speed Air flow mode Heating Heating Quiet Quiet Cool Air Prevention Cool Air Prevention S-Lo S-Lo Cooling / Fan Cooling / Fan Quiet Quiet *Soft Quiet *Soft Quiet Auto X, J zone:440...
  • Page 8 (rpm) (rpm) ARU7RLF (Static pressure:25Pa) ARU9RLF (Static pressure:25Pa) Operation mode Fan Speed Operation mode Fan Speed Air flow mode Air flow mode 1160 1260 Heating Heating 1000 1160 1060 Quiet Quiet S-Lo S-Lo 1160 1260 Cooling / Fan Cooling / Fan...
  • Page 9 AGU9RLF (rpm) Speed Operation mode Air flow mode Upper& Lower Upper air flow mode air flow mode Powerful (Upper/ Lower) 1230/ 1040 1300 Heating 1120/ 950 1230 1000/ 850 1090 860/ 730 Quiet 660/ 560 Cool air prevention 660/ 560 S-Lo 660/ 560 1230/ 1040...
  • Page 10 (rpm) (rpm) ASU9RLS2 ASU12RLS2 Operation mode Fan Speed Operation mode Fan Speed Air flow mode Air flow mode Heating Heating Poweful Poweful 1050 1160 1030 1110 1030 1110 1030 Quiet Quiet Cool Air Prevention Cool Air Prevention S-Lo S-Lo Cooling / Fan Poweful 1080 Cooling / Fan...
  • Page 11 (rpm) (rpm) ASU7RLF1 ASU9RLF1 Operation mode Air flow mode Fan Speed Operation mode Air flow mode Fan Speed Heating Heating Poweful Poweful 1090 1140 1050 1090 1000 1040 Quiet Quiet Cool Air Prevention Cool Air Prevention S-Lo S-Lo Cooling / Fan Poweful 1090 Cooling / Fan...
  • Page 12 2. FAN OPERATION The airflow can be switched in 5 steps such as Auto, Quiet, Lo, Me, Hi, while the indoor fan only runs. When Fan mode is set at (Auto), it operates on (Me) Fan Speed. < All models > 3.
  • Page 13 5. HEATING OPERATION Switch the airflow [Auto], and the indoor fan will run according to a room temperature, as shown in Fig 5. On the other hand, if switched in [Hi] [Quiet], the indoor fan will run at a constant airflow of [Heat] operation modes Quiet, Lo, Me, Hi, as shown in Table 2.
  • Page 14 < AUU type > < AGU type > When Indoor heat exchanger When Indoor heat exchanger temperature rises temperature rises When Indoor heat exchanger When Indoor heat exchanger temperature drops temperature drops 107.6°F 107.6°F (42°C) (42°C) 93.2°F 98.6°F Me or setting Me+ or setting (34°C) (37°C)

  • Page 15: Louver Control

    4. LOUVER CONTROL For Compact Wall Mounted Type, Wall Mounted Type < ASU7/ 9/ 12/ 18/ 24RLF > 1. VERTICAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follow: (Fig.7 : Virtical Air Direction Range) <Compact Wall Mounted Type>...
  • Page 16 For Wall Mounted Type < ASU9/ 12/ 15RLS2 > 1. VERTICAL LOUVER CONTROL (Function Range) Each time the button is pressed, the air direction range will change as follow: (Fig.9 : Virtical Air Direction Range) Types of Air flow Direction Setting: : During Cooling/Dry modes : During Heating The Remote Controller's display does not change.
  • Page 17 > For Wall Mounted Type < ASU7/ 9/ 12/ 15 RLF1 1. VERTICAL LOUVER CONTRO L (Function Range) (Fig.10 Virtical Air Direction Range) Each time the button is pressed, the air direction range will change as follow: The Remote Controller's display does not change. If you set the angle to position 4.7 for more than 30 minutes in COOL or DRY mode, they automatically return to position 3.
  • Page 18 For Compact Cassette Type < AUU7/ 9/ 12/ 18RLF > (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 19 For Floor Type < AGU9/ 12/ 15RLF > (Function and Operation Range) Each time the button is pressed, the air direction range will change as follows: ( Fig.12 : Air Direction Range) Use the air direction adjustments within the ranges shown above. The vertical airflow direction is set automatically as shown, in accordance with the type of operation selected.

  • Page 20: Outdoor Fan Control

    5. OUTDOOR FAN CONTROL 1. Outdoor Fan Motor The Table 6 shows the fan speed of the outdoor unit. ( Table 6 : Fan speed of the outdoor unit ) Cooling Heating AOU18RLXFZ 780/ 730/ 400/ 300/ 250/ 200 rpm 780/ 730/ 660/ 400/ 300/ 250/ 200 rpm AOU24RLXFZ 900/ 780/ 400/ 300/ 200 rpm...

  • Page 21: Timer Operation Control

    6. TIMER OPEARTION CONTROL 6-1 WIRELESS REMOTE CONTROLLER The Table 7 shows the available timer setting based on the product model. ( Table 7 : Timer setting ) ON TIMER / OFF TIMER PROGRAM TIMER SLEEP TIMER *WEEKLY TIMER * For ASU9/ 12/ 15RLS2 type * For ASU9/ 12/ 15RLS2 type 1.
  • Page 22 3. SLEEP TIMER If the sleep is set, the room temperature is monitored and the operation is stopped automatically. If the operation mode or the set temperature is change after the sleep timer is set, the operation is continued according to the changed setting of the sleep timer from that time ON. In the cooling operation mode When the sleep timer is set, the setting temperature is increased 2 F(1 C).
  • Page 23 6-2 WIRED REMOTE CONTROLLER The Table 8 shows the available timer setting based on the product model. ( Table 8 : Timer setting ) ON TIMER / OFF TIMER WEEKLY TIMER TEMPERATURE SET BACK TIMER ON TIMER / OFF TIMER Same to 6-1 ON / OFF TIMER and shown in those.

  • Page 24: Compressor Control

    7. COMPRESSOR CONTROL 1. OPERATION FREQUENCY RANGE The operation frequency of the compressor is different based on the operation mode as shown in the Table 9. (Table 9 : Compressor Operation Frequency Range) Cooling Heating AOU18RLXFZ 20rps 100rps 24rps 110rps AOU24RLXFZ AOU36RLXFZ 20rps...

  • Page 25: Electronic Expansion Valve Control

    8. ELECTRONIC EXPANSION VALVE CONTROL The most proper opening of the electronic expansion valve is calculated and controlled under the present operating condition based on the Table 10. The compressor frequency, the temperatures detected by the discharge temperature sensor and the outdoor temperature sensor. (Table 10 : The pulse range of the electronic expansion valve control) Operation mode Pulse range...

  • Page 26: Way Valve Extension Select

    11. 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. 12. AUTO RESTART When the power was interrupted by a power failure, etc.

  • Page 27: Compressor Preheating

    14. COMPRESSOR PREHEATING When the outdoor heat exchanger temperature is lower than Operation temperature (Refer to Table 13) and the heating operation has been stopped for 3 hours, 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 Release temperature or greater, preheating is over.

  • Page 28: Fresh Air Control

    18. FRESH AIR CONTROL( For AU / AR type) The fan motor for Fresh Air is operated in synchronization with the indoor fan operation as shown in Figure 14. (Fig.14 : Fresh Air control) Operation Fan motor (Indoor unit) Stop Operation Fan motor (for Fresh Air)

  • Page 29: Drain Pump Operation

    20. 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.

  • Page 30: Defrost Operation Control

    21. DEFROST OPERATION CONTROL 1. CONDITION OF STARTING THE DEFROST OPERATION The defrost operation starts when the outdoor heat exchanger temperature sensor detects the temperature lower than the values shown in Table 17-1, 17-2, 17-3. 1-1 NORMAL DEFROST For AOU18 / 24RLXFZ (Table 17-1 : Condition of starting defrost operation) Compressor integrating operation :45min and over...
  • Page 31 3. Defrost Flow Chart The defrosting shall proceed by the integrating operation time, outdoor temperature and outdoor heat exchanger temperature as follows. For AOU18 / 24RLXFZ Heating operation start : Compressor ON (Not defrosted for 6 or 10 minutes) Integrating defrost Normal defrost Outside air temp.
  • Page 32 For AOU36RLXFZ Heating operation start : Compressor ON (Not defrosted for 6 or 10 minutes) Normal defrost Integrating defrost Outside air temp. Outside air temp. Intermittent operation Continuous operation > 30.2°F(-1°C) < 30.2°F(-1°C) Compressor Compressor OFF count : integrating 40 times operation: Outdoor HEX Outdoor HEX...

  • Page 33: Various Protections

    22. VARIOUS PROTECTIONS 1. DISCHARGE GAS TEMPERATURE OVER RISE PREVENTION CONTROL The discharge gas thermosensor (discharge thermistor : Outdoor side) will detect discharge gas temperature. When the discharge temperature becomes higher than ,the compressor frequency is decreased 20rps, and it continues to decrease the frequency for 20rps every 120 seconds until the temperature becomes lower than When the discharge temperature becomes lower than ,the control of the compressor...
  • Page 34 4. COOLING PRESSURE OVER RISE PROTECTION When the outdoor unit heat exchange sensor temperature rises to 158.9 6°F(70.5 3°C) or greater, the compressor is stopped and error display is indicated. 5. 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 35: Trouble Shooting

    R410A Slim Duct / Compact Cassette Compact Wall Mounted / Wall Mounted / Floor type INVERTER (MULTI ) 2 . TROUBLE SHOOTING...

  • Page 36: Error Display

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

  • Page 37: 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 38: Outdoor Unit Display

    2-1-3 OUTDOOR UNIT DISPLAY 1. ERROR DISPLAY Trouble Error Contents LED1 LED2 LED3 LED4 shooting Serial communication error 1 time (Outdoor unit to Indoor unit A) Serial communication error 1 time (Outdoor unit to Indoor unit B) Serial communication error 1 time (Outdoor unit to Indoor unit C) Serial communication error...

  • Page 39: 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 40 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: When the outdoor unit cannot properly receive the serial signal from Indoor unit Controller PCB indoor unit for 10 seconds or more.
  • Page 41 Trouble shooting 3 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. 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 (Option) Wired Remote Controller for 1 minute or more.
  • Page 42 Trouble shooting 4 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Unit Capacity Error Detective Actuators: Detective details: The total capacity of the indoor unit if it is install beyond. All indoor unit Forecast of Cause : 1.
  • Page 43 Trouble shooting 5 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Unit Model Information Error EEPROM Access Abnormal Detective details: Detective Actuators: When power is on and there is some below case. Indoor unit Controller PCB When model information of EEPROM is incorrect.
  • Page 44 Indicate or Display: Trouble shooting 6 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 45 Trouble shooting 7 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Room Thermistor Error Detective details: Detective Actuators: Indoor Unit Controller PCB Circuit Room temperature thermistor is open or short is detected always. Room temperature Thermistor Forecast of Cause : 1.
  • Page 46 Trouble shooting 8 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Heat Ex. Thermistor Error Detective Actuators: Detective details: Indoor Unit Controller PCB Heat Exchanger (MID) thermistor is open or short is detected always. Heat Exchanger (MID) Thermistor Forecast of Cause : 1.
  • Page 47 Trouble shooting 9 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Indoor Unit Fan Motor Error Detective Actuators: Detective details: When the condition that actual frequency of Indoor Fan is Indoor unit Controller PCB below 1/3 of target frequency is continued more than 56 seconds. Indoor unit fan motor Forecast of Cause: 1.
  • Page 48 Indicate or Display: Trouble shooting 10 INDOOR UNIT Error Method: Refer to error code table. Drainage 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. Float switch failure 2. Shorted connector/wire 3. Controller PCB failure 4.
  • Page 49 Trouble shooting 11-1 Indicate or Display: INDOOR UNIT Error Method: Damper error Refer to error code table. (Damper(Open/Close) detection Limit switch error) Detective Actuators: Detective details: When limit switch were not able to detect the close though the damper close. Indoor unit Controller PCB (Upper air flow) Limit switch...
  • Page 50 Trouble shooting 11-2 Indicate or Display: INDOOR UNIT Error Method: Damper error Refer to error code table. (Damper(Open/Close) simultaneous detection Limit switch error) Detective Actuators: Detective details: When the limit switch detects open and close at the simultaneous. Indoor unit Controller PCB Limit switch Forecast of Cause : 1.
  • Page 51 Trouble shooting 12 Indicate or Display: INDOOR UNIT Error Method: INDOOR UNIT Refer to error code table. Intake Grille Error Detective Actuators: Detective details: Indoor unit Controller PCB When the Micro switch is detected open while running the compressor. Micro switch Forecast of Cause : 1.
  • Page 52 Trouble shooting 13 Indicate or Display: INDOOR UNIT Error Method: Refer to error code table. Outdoor Unit Model Information 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. When the access to EEPROM failed.
  • Page 53 Trouble shooting 14 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Active Filter Error Detective Actuators: Detective details: Outdoor unit Main PCB When inverter input DC voltage is higher than 425V or Active filter module lower than 80V. When a momentary power cut off occurred on low voltage Forecast of Cause : 1.
  • Page 54 Trouble shooting 15 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. IPM Error Detective Actuators: Detective details: When more than normal operating current to IPM in Main PCB flows, Outdoor unit Main PCB the compressor stops. Compressor After the compressor restarts, if the same operation is repeated within 40sec, the compressor stops again.
  • Page 55 Indicate or Display: Trouble shooting 16 OUTDOOR UNIT Error Method: Refer to error code table. Discharge Thermistor Error Detective details: Detective Actuators: When Discharge Pipe Temperature Thermistor open or short-circuit Outdoor Unit Main PCB Circuit is detected at power ON or while running the compressor. Discharge Pipe Temperature Thermistor Forecast of Cause : 1.
  • Page 56 Indicate or Display: Trouble shooting 17 OUTDOOR UNIT Error Method: Refer to error code table. Compressor Thermistor Error Detective Actuators: Detective details: When Compressor Temperature Thermistor open or short-circuit is Outdoor Unit Main PCB Circuit detected at power ON or while running the compressor. Compressor Temperature Thermistor Forecast of Cause : 1.
  • Page 57 Indicate or Display: Trouble shooting 18 OUTDOOR UNIT Error Method: Refer to error code table. Heat Ex. Thermistor Error Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When Heat Exchanger Temperature Thermistor open or short-circuit is Heat Exchanger Temperature Thermistor detected at power ON or while running the compressor.
  • Page 58 Indicate or Display: Trouble shooting 19 OUTDOOR UNIT Error Method: Refer to error code table. Outdoor Thermistor Error Detective Actuators: Detective details: Outdoor Unit Main PCB Circuit When Outdoor Temperature Thermistor open or short-circuit is detected at power ON or while running the compressor. Outdoor Temperature Thermistor Forecast of Cause : 1.
  • Page 59 Indicate or Display: Trouble shooting 20 OUTDOOR UNIT Error Method: Refer to error code table. 2-way valve Thermistor Error Detective details: Detective Actuators: Outdoor Unit Main PCB Circuit When 2-way valve Temperature Thermistor open or short-circuit is detected at power ON or while running the compressor. 2-way valve Temperature Thermistor Forecast of Cause : 1.
  • Page 60 Indicate or Display: Trouble shooting 21 OUTDOOR UNIT Error Method: 3-way valve Thermistor Error Refer to error code table. Detective details: Detective Actuators: When 3-way valve Temperature Thermistor open or short-circuit is Outdoor Unit Main PCB Circuit detected at power ON or while running the compressor. 3-way valve Temperature Thermistor Forecast of Cause : 1.
  • Page 61 Indicate or Display: Trouble shooting 22 OUTDOOR UNIT Error Method: Refer to error code table. Heat Sink Thermistor Error Detective details: Detective Actuators: When Heat Sink Temperature Thermistor open or short-circuit is Outdoor Unit Main PCB Circuit detected at power ON or while running the compressor. Heat Sink Temperature Thermistor Forecast of Cause : 1.
  • Page 62 Indicate or Display: Trouble shooting 23 OUTDOOR UNIT Error Method: INDOOR UNIT Refer to error code table. High Pressure Switch Error Detective details: Detective Actuators: When pressure switch open is detected in 10 seconds Outdoor Unit Main PCB Circuit after the power is turned on. Pressure Switch Forecast of Cause : 1.
  • Page 63 Trouble shooting 24 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Over Current Error 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 64 Trouble shooting 25 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor Control 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 90°, Compressor the compressor stops.
  • Page 65 Trouble shooting 26 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 66 Trouble shooting 27 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 67 Trouble shooting 28 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Discharge Temp. Error Detective details: Detective Actuators: °F Outdoor unit Main PCB "Protection stop by "discharge temperature (18/24type) / Discharge temperature thermistor °F(36 type) during compressor operation"" generated 2 times within 24 hours.
  • Page 68 Trouble shooting 29 Indicate or Display: OUTDOOR UNIT Error Method: Refer to error code table. Compressor Temp. Error Detective details: Detective Actuators: "Protection stop by Compressor temperature thermistor °F °F(36 "compressor temperature (18/24type)/257 type) during compressor operation"" generated 2 times within 24 hours. Forecast of Cause : 1.

  • Page 69: Trouble Shooting With No Error Code

    2-3 TROUBLE SHOOTING WITH NO ERROR CODE Forecast of Cause: Trouble shooting 30 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 70 Forecast of Cause: Trouble shooting 31 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 71 Forecast of Cause: Trouble shooting 32 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 72 Forecast of Cause: Trouble shooting 33 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 73 Forecast of Cause : Trouble shooting 34 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 74: 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 loose bolt or contact noise...
  • Page 75 SERVICE PARTS INFORMATION 2 Inverter Compressor Check Point 1 : Check Connection Check terminal connection of Compressor Check terminal connection of Main PCB (loose or incorrect wiring) (loose or incorrect wiring) W (T) V(S) (BLACK) Main PCB (WHITE) TM305 TM304 TM303 Main PCB BLACK...
  • Page 76 SERVICE PARTS INFORMATION 3 Outdoor unit Electronic Expansion Valve ( EEV ) Check Point 1 : Check Connections Check connection of connector ( Loose connector or open cable ) For AOU18RLXFZ For AOU24RLXFZ EXPANSION EXPANSION VALVE COIL A VALVE COIL A BROWN BROWN BLUE...
  • Page 77 Check Point 3 : Check Voltage from Main PCB. Check Point 2 : Check Coil of EEV Remove connector, check each winding Remove Connector and check Voltage (DC12V) resistance of Coil. If it does not appear, replace Main PCB. Read wire Resistance value White - Red Check Point 4 : Check Noise at start up...
  • Page 78 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 Fan Motor Refer to below.
  • Page 79 SERVICE PARTS INFORMATION 6 Active filter module Check Point 1 : Check Open or Short-circuit and Diode (D1) Remove connector, check the open or short-circuit and the diode in the module Check the open or short-circuit Terminal Resistance value Tester(+) Tester(-) (+IN) ( IN)

  • Page 80: Replacement Parts

    R410A Slim Duct / Compact Cassette Compact Wall Mounted / Wall Mounted / Floor type INVERTER (MULTI ) 3 . REPLACEMENT PARTS...
  • Page 81 3-1 AOU18/ 24RLXFZ 3-1-1 PARTS LAYOUT DRAWING ACTPM Main PCB Condenser A assy Filter PCB Motor DC Brushless Pressure SW Choke Coil Accumulator Solenoid 4-way valve Propeller Fan assy Coil (Expansion valve)& Expansion valve Compressor AOU24RLXFZ 4-way valve Solenoid Coil (Expansion valve)& Expansion valve AOU18RLXFZ 03-01...
  • Page 82 Thermo Holder& Thermistor (Outdoor Temp.) 2-way valve assy (Liquid) Thermistor (Heat exchanger temp.) 3-way valve assy (Gas) AOU24RLXFZ Thermo Holder& Thermistor (Outdoor Temp.) Thermistor 2-way valve assy (Heat exchanger temp.) (Liquid) 3-way valve assy (Gas) AOU18RLXFZ 03-02...
  • Page 83 3-1-2 DISASSEMBLY PROCESS (AOU18/ 24RLXFZ) 1. Service Panel sub assy removal Remove the 2 mounting screws. Remove the Service Panel sub assy by sliding downward. Replaceable Component Compressor Accumulator 4-way valve Solenoid Thermistor (Compressor temp.) Thermistor (Discharge temp.) Thermistor (Outdoor temp.) Hook (3 places) Thermistor (Heat exchanger temp.)
  • Page 84 3. Inverter Box removal Remove the 6 mounting screws. Remove the power supply & connection cord. Remove the connectors connected to Main PCB. (Thermistor, EEV, and so on) Remove the Inverter Box upward. REAR VIEW FRONT VIEW Inverter Box 03-04...
  • Page 85 4. Inverter Box Cover removal Remove the 1 mounting screw. Remove the Inverter Box Cover upward. Inverter Box Cover Hook (2 places) 03-05...
  • Page 86 5. Main PCB removal Remove the 4 mounting screws. (Refer to VIEW -A) Remove the wires from terminal. (Refer to VIEW -B) Remove the wires. (Refer to VIEW -C, -D) Remove the Main PCB. Hook Screw (Diode Bridge) Main PCB Screw (IPM) Screw...
  • Page 87 CN34(Yellow) CN1(White) VIEW - C Main PCB Filter PCB TM101(Black) TM102(White) VIEW - D 03-07...
  • Page 88 Precautions for exchange of Main PCB Diode Bridge Spread the heat dissipation compound on the other side of IPM and Diode Bridge, when you exchange Main PCB by the repair. VIEW - E 03-08...
  • Page 89 6. Filter PCB removal Remove the 2 mounting screws. (Refer to VIEW -A) Remove the wires from terminal and fuse holder. (Refer to VIEW -B) Remove the Filter PCB. Hook Screw Filter PCB VIEW - A Black White Black White Black White Black...
  • Page 90 7. ACTPM removal Remove the connectors and cords. (Refer to VIEW -F) Remove the 2 mounting screws. (Refer to VIEW -F) Remove the ACTPM (Active Filter Module). Twist 4 times or more 2 turn the Wire this way Screw " - " (Black) "...
  • Page 91 8. Valve Cover sub assy removal Remove the 3 mounting screws. Remove the Valve Cover sub assy. Hook Valve Cover sub assy 9. Thermo Holder removal Remove the 1 mounting screw. Remove the Thermo Holder by sliding upward. Thermo Holder 03-11...
  • Page 92 10. Right Panel sub assy removal Remove the 13 mounting screws. Hook Remove the Right Panel sub assy by sliding upward. Right Panel sub assy 03-12...
  • Page 93 3-2 AOU36RLXFZ 3-2-1 PARTS LAYOUT DRAWING Main PCB ACTPM Filter PCB Condenser A assy 4-way valve Motor DC Brushless Receiver Tank sub assy Choke Coil Pressure SW Solenoid Propeller Fan assy Coil (Expansion valve)& Expansion valve Accumulator Compressor 03-13...
  • Page 94 Thermo Holder& Thermistor (Outdoor Temp.) 3-way valve assy 2-way valve assy (Gas) (Liquid) Thermistor (Heat exchanger temp.) 3-way valve assy (Gas) 03-14...
  • Page 95 3-2-2 DISASSEMBLY PROCESS (AOU36RLXFZ) 1. Service Panel sub assy removal Remove the 2 mounting screws. Remove the Service Panel sub assy by sliding downward. Replaceable Component Compressor Accumulator 4-way valve Solenoid Thermistor (Compressor temp.) Hook Thermistor (Discharge temp.) (3 places) Thermistor (Outdoor temp.) Thermistor (Heat exchanger temp.) Thermistor (2/3-way valve temp.)
  • Page 96 3. Inverter Box removal Remove the 6 mounting screws. Remove the power supply & connection cord. Remove the connectors connected to Main PCB. (Thermistor, EEV, and so on) Remove the Inverter Box upward. REAR VIEW FRONT VIEW Inverter Box 03-16...
  • Page 97 4. Inverter Box Cover removal Remove the 1 mounting screw. Remove the Inverter Box Cover upward. Inverter Box Cover Hook (2 places) 03-17...
  • Page 98 5. Main PCB removal Remove the 4 mounting screws. (Refer to VIEW -A) Remove the wires from terminal. (Refer to VIEW -B) Remove the wires. (Refer to VIEW -C, -D) Remove the Main PCB. Hook Screw (Diode Bridge) Main PCB Screw (IPM) Screw...
  • Page 99 CN34(Yellow) CN1(White) VIEW - C POSISTOR Main PCB Filter PCB TM101(Black) TM102(White) VIEW - D 03-19...
  • Page 100 Precautions for exchange of Main PCB Diode Bridge Spread the heat dissipation compound on the other side of IPM and Diode Bridge, when you exchange Main PCB by the repair. VIEW - E 03-20...
  • Page 101 6. Filter PCB removal Remove the 2 mounting screws. (Refer to VIEW -A) Remove the wires from terminal and fuse holder. (Refer to VIEW -B) Remove the Filter PCB. Hook Screw Filter PCB VIEW - A Black White Black White VIEW - B 03-21...
  • Page 102 7. ACTPM removal Remove the connectors and cords. (Refer to VIEW -F) Remove the 2 mounting screws. (Refer to VIEW -F) Remove the ACTPM (Active Filter Module). Twist 4 times or more 2 turn the Wire this way Screw " - " (Black) "...
  • Page 103 8. Valve Cover sub assy removal Remove the 3 mounting screws. Remove the Valve Cover sub assy. Hook Valve Cover sub assy 9. Thermo Holder removal Remove the 1 mounting screw. Remove the Thermo Holder by sliding upward. Thermo Holder 03-23...
  • Page 104 10. Right Panel sub assy removal Remove the 13 mounting screws. Hook Remove the Right Panel sub assy by sliding upward. Right Panel sub assy 03-24...
  • Page 105 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan May. 2014 (Revised) Novenber. 2013 (Revised) June. 2011 (Issued)

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