Fujitsu GENERAL ASHG09KMCEN-B Service Manual
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Fujitsu GENERAL ASHG09KMCEN-B Service Manual

Fujitsu GENERAL ASHG09KMCEN-B Service Manual

Wall mounted type, for cold climate region, indoor/outdoor
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AIR CONDITIONER
Wall mounted type
INDOOR
ASHG09KMCEN-B
ASHG12KMCEN-B
ASHG14KMCEN-B
OUTDOOR
AOHG09KMCEN
SERVICE MANUAL
AOHG12KMCEN
For Cold Climate Region
AOHG14KMCEN
SR_AS138EG_03
2025.03.19

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Summary of Contents for Fujitsu GENERAL ASHG09KMCEN-B

  • Page 1 AIR CONDITIONER Wall mounted type SERVICE MANUAL For Cold Climate Region INDOOR ASHG09KMCEN-B ASHG12KMCEN-B ASHG14KMCEN-B OUTDOOR AOHG09KMCEN AOHG12KMCEN AOHG14KMCEN SR_AS138EG_03 2025.03.19...
  • Page 2 App Store is a service mark of Apple Inc., registered in the U.S. and other countries. IOS is a trademark or registered trademark of Cisco in the U.S. and other countries and is used under license. Copyright © 2024 Fujitsu General Limited. All rights reserved.

  • Page 3: General Information

    CONTENTS 1. GENERAL INFORMATION 2. TECHNICAL DATA AND PARTS LIST 3. TROUBLESHOOTING 4. CONTROL AND FUNCTIONS 5. FIELD WORKING...
  • Page 5 1. GENERAL INFORMATION 2024.12.02 SR_CH01_AS138EG_02...
  • Page 6 CONTENTS 1. GENERAL INFORMATION 1. Specifications....................01-1 1-1. Indoor unit ........................01-1 1-2. Outdoor unit........................01-3 2. Dimensions....................01-4 2-1. Indoor unit ........................01-4 2-2. Outdoor unit........................01-6...
  • Page 7 1. Specifications 1-1. Indoor unit Wall mounted Type Inverter, Heat pump Model name ASHG09KMCEN-B ASHG12KMCEN-B ASHG14KMCEN-B Power supply intake Outdoor unit Voltage System power supply Frequency Available voltage range 198—264 Indoor unit power supply (from outdoor unit) Rated Btu/h 8,500 11,600 14,300 Cooling...
  • Page 8 Wall mounted Type Inverter, Heat pump Model name ASHG09KMCEN-B ASHG12KMCEN-B ASHG14KMCEN-B NOTES: • Specifications are based on the following conditions: – Cooling: Indoor temperature of 27°CDB/19°CWB, and outdoor temperature of 35°CDB/24°CWB. – Heating: Indoor temperature of 20°CDB/—°CWB, and outdoor temperature of 7°CDB/6°CWB. –...

  • Page 9: Outdoor Unit

    1-2. Outdoor unit Type Inverter, Heat pump Model name AOHG09KMCEN AOHG12KMCEN AOHG14KMCEN Power supply 230 V~ 50 Hz Power supply intake Outdoor unit Available voltage range 198—264 V Starting current Cooling 1,770 2,210 2,450 Airflow rate Heating 1,313 1,335 2,330 Type ×...
  • Page 10 2. Dimensions 2-1. Indoor unit ¢ Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B Unit: mm Outline of indoor unit for pipe inlet Ø65 for pipe inlet Ø65 - (01-4) - 2-1. Indoor unit 2. Dimensions...

  • Page 11: Installation Space Requirement

     Installation space requirement Provide sufficient installation space for product safety. Unit: mm 40 or more 70 or more Wall hook bracket 107 or more 183 or more Outline of the indoor unit 1,500 or more A: Install so that the flare connection part is outdoors. - (01-5) - 2-1.
  • Page 12 2-2. Outdoor unit ¢ Model: AOHG09KMCEN Unit: mm 4-M10 hole Pitch of bolts for installation Top view Side view Front view Side view Airflow Drain port Ø42 Bottom view Side view (Valve part) - (01-6) - 2-2. Outdoor unit 2. Dimensions...
  • Page 13 ¢ Model: AOHG12KMCEN Unit: mm 4-M10 hole Pitch of bolts for installation Top view Side view Front view Side view Airflow Drain port Ø42 Bottom view Side view (Valve part) - (01-7) - 2-2. Outdoor unit 2. Dimensions...
  • Page 14 ¢ Model: AOHG14KMCEN Unit: mm 4-M10 hole Pitch of bolts for installation Side view Front view Side view Airflow Drain port Ø42 Bottom view Side view (Valve part) - (01-8) - 2-2. Outdoor unit 2. Dimensions...
  • Page 15 2. TECHNICAL DATA AND PARTS LIST 2025.03.19 SR_CH02_AS138EG_02...
  • Page 16 CONTENTS 2. TECHNICAL DATA AND PARTS LIST 1. Precautions....................02-1 2. Indoor unit parts list..................02-2 2-1. Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B ....02-2 3. Outdoor unit parts list.................02-6 3-1. Model: AOHG09KMCEN ....................02-6 3-2. Model: AOHG12KMCEN ....................02-10 3-3. Model: AOHG14KMCEN ....................02-14 4. Accessories ....................02-18 4-1.
  • Page 17 • Service parts information and design are subject to change without notice for product improve- ment. • For the latest information of the service parts, refer to our Service Portal. https://fujitsu-general.force.com/portal/ • Precise figure of the service parts listed in this manual may differ from the actual service parts. - (02-1) -...

  • Page 18: Exterior Parts

    2. Indoor unit parts list 2-1. Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B ¢ Exterior parts - (02-2) - 2-1. Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B 2. Indoor unit parts list...
  • Page 19 Item no. Part no. Part name 9388142029 Bracket panel 9387714067 Stepping motor holder assy 9387456004 Stepping motor holder 9901263002 Stepping motor 9387590258 Drain pan total assy 9387479119 Horizontal louver assy 9384977540 Front panel total assy 9387473018 Air filter 9333951003 Louver spring 9316177017 Drain cap 9316904002...
  • Page 20 ¢ Base, evaporator, and control - (02-4) - 2-1. Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B 2. Indoor unit parts list...
  • Page 21 Item no. Part no. Part name 9387587258 Base assy 9384563040 WLAN Adapter 9712340077 Main PCB (09 model) 9712340084 Main PCB (12 model) 9712340091 Main PCB (14 model) 9901013010 Terminal block 9711146021 Display assy 9711147028 Indicator PCB 9387447002 Motor case 9603688028 DC fan motor (09 model) 9603492021 DC fan motor (12—14 model)
  • Page 22 3. Outdoor unit parts list 3-1. Model: AOHG09KMCEN ¢ Exterior parts and Chassis - (02-6) - 3-1. Model: AOHG09KMCEN 3. Outdoor unit parts list...
  • Page 23 Item no. Part no. Part name 9322556028 Top panel assy 9377840011 Protective net assy 9322553287 Motor bracket assy 9322552020 Cabinet right assy 9322570000 Switch cover assy 9322138002 Thermistor holder 9709688298 Main PCB 9900850012 Thermistor (Outdoor temp.) 9900935047 Thermistor assy 9323550032 Base assy 9384265012 Fan guard...
  • Page 24 ¢ Compressor - (02-8) - 3-1. Model: AOHG09KMCEN 3. Outdoor unit parts list...
  • Page 25 Item no. Part no. Part name 9322431004 Compressor assy 9322445018 4-way valve assy 9970194023 Solenoid 9970095122 Expansion valve coil 9322463005 Pulse motor valve assy 9322474001 2-way valve assy 9322475008 3-way valve assy 9324024006 Sound insulator B 9322537003 Sound insulator H 9323045002 Sound insulator V 9322536006...
  • Page 26 3-2. Model: AOHG12KMCEN ¢ Exterior parts and Chassis - (02-10) - 3-2. Model: AOHG12KMCEN 3. Outdoor unit parts list...
  • Page 27 Item no. Part no. Part name 9322556066 Top panel assy 9377854025 Protective net assy 9322327000 Thermistor holder 9322552099 Cabinet right assy 9322570024 Switch cover assy 9323550032 Base assy 9709688304 Main PCB 9900850012 Thermistor (Outdoor temp.) 9900935054 Thermistor assy 9384273017 Fan guard 9384851000 Front panel assy 0700103070...
  • Page 28 ¢ Compressor - (02-12) - 3-2. Model: AOHG12KMCEN 3. Outdoor unit parts list...
  • Page 29 Item no. Part no. Part name 9322433008 Compressor assy 9322445018 4-way valve assy 9970194023 Solenoid 9970095122 Expansion valve coil 9322463005 Pulse motor valve assy 9322474001 2-way valve assy 9322475008 3-way valve assy 9323045002 Sound insulator V 9322537003 Sound insulator H 9324024006 Sound insulator B 9322847003...
  • Page 30 3-3. Model: AOHG14KMCEN ¢ Exterior parts and chassis - (02-14) - 3-3. Model: AOHG14KMCEN 3. Outdoor unit parts list...
  • Page 31 Item no. Part no. Part name 9322556073 Top panel assy 9334053003 Protective net assy 9322327000 Thermistor holder 9322552082 Cabinet right assy 9322570031 Switch cover assy 9709688311 Main PCB 9900850012 Thermistor (Outdoor temp.) 9900935115 Thermistor assy 9900985011 Thermistor (Compressor) 9323920002 Base assy 9810028006 Thermistor stopper 9384273017...
  • Page 32 ¢ Compressor - (02-16) - 3-3. Model: AOHG14KMCEN 3. Outdoor unit parts list...
  • Page 33 Item no. Part no. Part name 9810521002 Compressor 9970095122 Expansion valve coil 9322462008 Pulse motor valve assy 9900186029 Pressure switch 9970194023 Solenoid 9970205002 4-way valve 9322459008 Joint pipe (Condenser) 9322791009 Suction pipe assy 9383949036 Discharge pipe assy 9322474001 2-way valve assy 9322850010 3-way valve assy 9324014014...

  • Page 34: Outdoor Unit

    4. Accessories 4-1. Indoor unit ¢ Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B Part name Exterior Part name Exterior Self-tapping screw Operation manual (large) Self-tapping screw Installation manual (small) Wall hook bracket Cloth tape Remote controller Filter holder Remote controller Air cleaning filters holder Battery Installation spacer...
  • Page 35 5. Optional parts 5-1. Indoor unit ¢ Controllers Exterior Part name Model name Summary Easy finger touch operation with LCD panel. Backlit LCD enables easy Wired Remote operation in a dark room. Controller UTY-RNRGZ Optional Communication Kit is (Touch Panel) necessary for installation.

  • Page 36: Indoor Unit

    ¢ Indoor unit Exterior Part name Model name Summary Air Cleaning Filter can be mounted to Air Cleaning UTR-FA16-5 the indoor unit. Filter (For antibacterial) Required when external device is External Connect connected. UTY-XWZXZ5 Connecting point: CN6 on Main PCB Use to connect with external devices and air conditioner PCB.

  • Page 37: Refrigerant System Diagrams

    6. Refrigerant system diagrams 6-1. Models: AOHG09KMCEN and AOHG12KMCEN Heat exchanger 3-way ( INDOOR ) valve 2-way Muffler valve Muffler 4-way valve Strainer Expansion valve Heat exchanger Strainer ( OUTDOOR ) Cooling Heating :Thermistor (Discharge temp.) :Thermistor (Outdoor temp.) :Thermistor (Heat exchanger out temp.) :Thermistor (Pipe temp.) :Thermistor (Room temp.) - (02-21) -...
  • Page 38 6-2. Model: AOHG14KMCEN Heat exchanger 3-way (INDOOR) valve 2-way Muffler valve Muffler Pressure switch Strainer 4-way valve Expansion valve Accumulator Heat exchanger Strainer (OUTDOOR) Cooling Heating : Thermistor (Compressor temperature) : Thermistor (Discharge temperature) : Thermistor (Outdoor temperature) : Thermistor (Heat exchanger out temperature) : Thermistor (Pipe temperature) : Thermistor (Room temperature) - (02-22) -...
  • Page 39 7. Wiring diagrams 7-1. Indoor unit ¢ Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B - (02-23) - 7-1. Indoor unit 7. Wiring diagrams...
  • Page 40 7-2. Outdoor unit ¢ Models: AOHG09KMCEN and AOHG12KMCEN - (02-24) - 7-2. Outdoor unit 7. Wiring diagrams...
  • Page 41 ¢ Model: AOHG14KMCEN - (02-25) - 7-2. Outdoor unit 7. Wiring diagrams...
  • Page 42 8. PC board diagrams 8-1. Models: ASHG09KMCEN-B, ASHG12KMCEN-B, and ASHG14KMCEN-B CONTROL UNIT 09KMCEN: EZ-0221EHSE 09KMCEN-B: EZ-02410HSE 12KMCEN: EZ-0221FHSE 12KMCEN-B: EZ-02411HSE 14KMCEN: EZ-0221GHSE 14KMCEN-B: EZ-02412HSE 2-WIRE REMOTE CONTROLLER UNIT ( OPTION ) UTY-TWRXZ2 CN301 UL1007 AWG22 CN300 REMOTE B07B-PASK-1 B03B-XNISK-A-1 UL1007 AWG22 WHITE CONTROLLER UL1061 AWG26...
  • Page 43 8-2. Models: AOHG09KMCEN and AOHG12KMCEN CONTROL UNIT 09 and 12 models : EZ-020YHUE EMI FILTER KRFC-13 EMI FILTER EMI FILTER 2 TURNS KRFC-13 KRFC-13 UL3271 1 TURN 2 TURNS AWG16 COMPRESSOR W400 UL3271 UL1015 TO INDOOR UNIT AWG20 AWG16 W103 W401 BLACK WHITE...
  • Page 44 8-3. Model: AOHG14KMCEN CONTROL UNIT 14 model : EZ-02000HUE EMI FILTER KRFC-13 2 TURNS EMI FILTER EMI FILTER KRFC-13 KRFC-13 UL3271 1 TURN AWG16 2 TURNS COMPRESSOR W400 TO INDOOR UNIT UL1015 UL3271 AWG20 AWG16 BLACK W103 W401 WHITE WHITE UL3271 UL1015 AWG16...

  • Page 45: Troubleshooting

    3. TROUBLESHOOTING 2024.12.02 SR_CH03_AS138EG_02...
  • Page 46 CONTENTS 3. TROUBLESHOOTING 1. Error code ....................03-1 1-1. How to check the error memory..................03-1 1-2. How to erase the error memory ..................03-1 1-3. Error code table (Indoor unit and wired remote controller)..........03-2 1-4. Error code table (Wireless LAN indicator)...............03-3 1-5. How to check the error code on Mobile app ..............03-4 1-6.

  • Page 47: Table Of Contents

    CONTENTS (continued) 3-6. Water leaking........................03-62 4. Troubleshooting with error code (For wireless LAN adapter)....03-63 4-1. E: 18. External communication error between indoor unit and wireless LAN adapter...03-63 4-2. Network communication error between wireless LAN router and wireless LAN adapter .............................03-64 4-3.

  • Page 49: Error Code

    1. Error code When a problem occurs in the system or the connected device, the error content is notified by dis- playing the code. NOTE: This function is only available in a system with indoor or IR receiver units equipped with in- dicator lamps to show the error content.
  • Page 50 1-3. Error code table (Indoor unit and wired remote controller) The operation, timer, and economy indicators operate according to the error contents. For confirmation of the error contents, refer the flashing pattern as follows. Indoor unit display Wired remote Error contents Operation [ ] Timer [ ] Economy [ ]...
  • Page 51 1-4. Error code table (Wireless LAN indicator) • Wireless LAN control system diagram example Indoor unit Internet Main PCB Cloud Wireless Mobile app Parts: Outdoor unit router (Smart device) WLAN adapter • Name of parts WLAN adapter Wireless LAN label MAC: SSID: AP- PIN:...
  • Page 52 1-5. How to check the error code on Mobile app If there is an abnormality on the air conditioning, refer to as follows. When the (error button) on the home screen is tapped, error code and error name is displayed. Error button Error code Error name...
  • Page 53 1-6. Error code table (Mobile app) Error message Error contents Error code Serial reverse transmission error at start-up 11.1 E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) Serial reverse transmission error during operation 11.2 Serial forward transmission error at start-up 11.3 E: 11.

  • Page 54: Error Message

    Error message Error contents Error code E: A3. Compressor temperature error (Outdoor Outdoor unit compressor 1 temperature error A3.1 unit) (For 14 model) - (03-6) - 1-6. Error code table (Mobile app) 1. Error code...
  • Page 55 1-7. Error message for wireless LAN control (Mobile app) ¢ Error display If there is an abnormality on the wireless control system, refer to error messages as follows. Error message - (03-7) - 1-7. Error message for wireless LAN control (Mobile app) 1.

  • Page 56: Error Message List

    ¢ Error message list • Registration error Cause Error Error message code Solution Communication failed. After Communication with the air conditioner failed. checking the following Check the following contents depending on the status of indoor contents, please try again unit wireless LAN indicator lamp or WLAN Adapter LED 2 and after a while.
  • Page 57 Cause Error Error message code Solution WLAN adapter password is Failed because the smartphone could not connect to the air wrong. Enter it again. conditioner. Check the following contents depending on the status of indoor When problems are not unit wireless LAN indicator lamp or WLAN Adapter LED 2 and resolved, there may be other operate again.
  • Page 58 Cause Error Error message code Solution • The air conditioner you are trying to register is already registered to another account. • Registration failed because the air conditioner cannot connect to the Internet. • Immediately after turning on the power of the air Air conditioner registration conditioner, wait for about 5 minutes before registering it.
  • Page 59 Cause Error Error message code Solution Registration may have failed because a problem occurred in communication with the server (cloud). 2944 Communication failed. Wait for a while and then operate again. The connected air conditioner Your air conditioner does not support Direct Control. 2946 cannot use the Direct control.
  • Page 60 • Sign in error Cause Error Error message code Solution Various settings could not be completed because Communication failed. After 4010 communication with the server (cloud) failed. checking the following 4410 contents, please try again after Check the following contents and operate again. a while.
  • Page 61 Cause Error Error message code Solution User information or temperature unit information could not be Loading of user information obtained because communication with the server (cloud) failed. failed. Check the following Check the following contents and operate again. contents. 4420 1.
  • Page 62 • General error Cause Error Error message code Solution 0100 Communication with the air conditioner failed. 0200 0300 0400 Check the following contents depending on the status of indoor 0500 unit wireless LAN indicator lamp or WLAN Adapter LED 2 and operate again.
  • Page 63 Cause Error Error message code Solution The outdoor unit low noise timer information could not be obtained because communication with the server (cloud) failed. Check the following contents depending on the status of indoor unit wireless LAN indicator lamp or WLAN Adapter LED 2 and operate again.
  • Page 64 Cause Error Error message code Solution The error history information could not be obtained because communication with the server (cloud) failed. Check the following contents depending on the status of indoor unit wireless LAN indicator lamp or WLAN Adapter LED 2 and operate again.
  • Page 65 Cause Error Error message code Solution Air conditioner group setting has not been completed because communication with air conditioner failed. Check the following contents depending on the status of indoor unit wireless LAN indicator lamp or WLAN Adapter LED 2 and operate again.
  • Page 66 Cause Error Error message code Solution Air conditioner group setting has not been completed because communication with air conditioner failed. Check the following contents depending on the status of indoor unit wireless LAN indicator lamp or WLAN Adapter LED 2 and operate again.
  • Page 67 Cause Error Error message code Solution Air conditioner group setting has not been completed because communication with air conditioner failed. Check the following contents depending on the status of indoor unit wireless LAN indicator lamp or WLAN Adapter LED 2 and operate again.
  • Page 68 Cause Error Error message code Solution Various settings could not be completed because Failed to update the screen. communication with the server (cloud) failed. After checking the following contents, please try again after Check the following contents and operate again. a while.

  • Page 69: Troubleshooting With Error Code (For Wireless Lan Adapter)

    2. Troubleshooting with error code 2-1. E: 11. Serial communication error (Serial reverse transfer error) (Outdoor unit) Operation indicator 1 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 11 Main PCB When the indoor unit cannot receive the serial signal from outdoor unit more than 2 minutes after power on, Detective actuator...
  • Page 70 Check point 4. Check serial signal (Reverse transfer signal) Check serial signal (Reverse transfer signal) GREEN WHITE BLACK WHITE BLACK • Check if indicated value swings between AC 90 V and AC 270 V at the outdoor unit terminal 1 —3.
  • Page 71 2-2. E: 11. Serial communication error (Serial forward transfer error) (Indoor unit) Operation indicator 1 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 11 Main PCB Indoor unit When the outdoor unit cannot properly receive the serial Detective actuator Fan motor signal from indoor unit for 10 seconds or more.
  • Page 72 Check point 4. Check serial signal (Forward transfer signal) Check serial signal (Forward transfer signal) GREEN WHITE BLACK WHITE BLACK • Check if indicated value swings between AC 30 V and AC 130 V at outdoor unit terminal 2—3. • If it is abnormal, replace main PCB.
  • Page 73 2-3. E: 12. Wired remote controller communication error (Indoor unit) Operation indicator 1 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 12 Indoor unit Main PCB When the indoor unit cannot receive the signal from Detective actuator Wired remote controller more than 1 minute during Wired remote control...
  • Page 74 2-4. E: 18. External communication error (Indoor unit) Operation indicator 1 time flash Timer indicator 8 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 18 External After receiving a signal from the external input and Detective actuator Indoor unit communication output PCB, the same signal has not been received for...
  • Page 75 2-5. E: 22. Indoor unit capacity error (Indoor unit) Operation indicator 2 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 22 When the total capacity of the indoor units does not Detective actuator Indoor unit main PCB match outdoor unit capacity while 3 minutes after power...
  • Page 76 2-6. E: 23. Combination error (Outdoor unit) Operation indicator 2 time flash Timer indicator 3 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 23 The outdoor unit receives the serial signal of applied Detective actuator Indoor unit refrigerant information from indoor unit.
  • Page 77 2-7. E: 26. Address setting error in wired remote controller (Indoor unit) Operation indicator 2 time flash Timer indicator 6 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 26 Wired remote controller (2-wire) • When the address number set by auto setting and manual setting are mixed in one remote controller group Detective actuator...
  • Page 78 2-8. E: 32. Indoor unit main PCB error (Indoor unit) Operation indicator 3 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 32 When power is on and there is some below case. Detective actuator Indoor unit Main PCB...
  • Page 79 2-9. E: 35. MANUAL AUTO button error (Indoor unit) Operation indicator 3 time flash Timer indicator 5 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 35 Indoor unit controller PCB When the MANUAL AUTO button becomes on for Detective actuator Indicator PCB consecutive 60 or more seconds.
  • Page 80 2-10. E: 41. Room temperature sensor error (Indoor unit) Operation indicator 4 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 41 Indoor unit main PCB Room temperature thermistor is open or short is Detective actuator detected always.
  • Page 81 2-11. E: 42. Indoor unit heat exchanger sensor error (Indoor unit) Operation indicator 4 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 42 Indoor unit main PCB When heat exchanger temperature thermistor open or Detective actuator Heat exchanger temperature short circuit is detected.
  • Page 82 2-12. E: 51. Indoor unit fan motor error (Indoor unit) Operation indicator 5 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 51 Main PCB When the actual rotation number of the indoor unit fan Detective actuator Indoor unit motor is below 1/3 of the target rotation number...
  • Page 83 2-13. E: 62. Outdoor unit main PCB error (Outdoor unit) Operation indicator 6 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 62 Access to EEPROM failed due to some cause after Detective actuator Outdoor unit Main PCB...
  • Page 84 2-14. E: 64. PFC circuit error (Outdoor unit) Operation indicator 6 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 64 • When inverter input DC voltage is higher than 415 V for over 3 seconds, the compressor stops. Detective actuator Outdoor unit Main PCB...
  • Page 85 2-15. E: 65. IPM error (Outdoor unit) Operation indicator 6 time flash Timer indicator 5 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 65 Main PCB 1. When more than normal operating current to IPM in main PCB flows, the compressor stops.
  • Page 86 Check point 4. Check compressor Check compressor. (Refer to inverter compressor in "Service parts information".) ↓ Check point 5. Replace main PCB If Check point 1 to 4 do not improve the symptom, change main PCB. ↓ - (03-38) - 2-15.
  • Page 87 2-16. E: 71. Discharge thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 71 Outdoor unit main PCB When discharge pipe temperature thermistor open or Detective actuator short circuit is detected at power on or while running the Discharge pipe temperature...
  • Page 88 2-17. E: 72. Compressor thermistor error (Outdoor unit) (For 14 model) Operation indicator 7 time flash Timer indicator 2 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 72 Outdoor unit main PCB When compressor temperature thermistor open or short Detective actuator circuit is detected at power on or while running the Compressor temperature thermistor...
  • Page 89 2-18. E: 73. Outdoor unit heat exchanger thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 3 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 73 Outdoor unit main PCB When heat exchanger temperature thermistor open or Detective actuator short circuit is detected at power on or while running the Heat exchanger temperature...
  • Page 90 2-19. E: 74. Outdoor temperature thermistor error (Outdoor unit) Operation indicator 7 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 74 Outdoor unit main PCB When outdoor temperature thermistor open or short Detective actuator circuit is detected at power on or while running the Outdoor temperature thermistor...
  • Page 91 2-20. E: 84. Current sensor error (Outdoor unit) Operation indicator 8 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 84 Main PCB When input current sensor has detected 0 A, while inverter compressor is operating at higher than 56 rps, Detective actuator Outdoor unit...
  • Page 92 Check point 1-2. Check external cause at Indoor and Outdoor (Voltage drop or Noise) • Instant drop: Check if there is a large load electric apparatus in the same circuit. • Momentary power failure: Check if there is a defective contact or leak current in the power sup- ply circuit.
  • Page 93 2-21. E: 86. High pressure switch error (Outdoor unit) (For 14 model) Operation indicator 8 time flash Timer indicator 6 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 86 Outdoor unit main PCB When pressure switch open is detected in 10 seconds Detective actuator after the power is turned on.
  • Page 94 2-22. E: 94. Trip detection (Outdoor unit) Operation indicator 9 time flash Timer indicator 4 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 94 Main PCB Protection stop by over-current generation after inverter compressor start processing completed generated consecutively 10 times.
  • Page 95 2-23. E: 95. Compressor motor control error (Outdoor unit) Operation indicator 9 time flash Timer indicator 5 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 95 Main PCB 1. When running the compressor, if the detected rotor location is out of phase with actual rotor location more than 90°, the compressor stops.
  • Page 96 2-24. E: 97. Outdoor unit fan motor error (Outdoor unit) Operation indicator 9 time flash Timer indicator 7 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 97 Main PCB 1. When outdoor fan rotation speed is less than 100 rpm in 20 seconds after fan motor starts, fan motor stops.
  • Page 97 Check point 4. Check output voltage of main PCB Check outdoor unit circuit diagram and the voltage. (Measure at main PCB side con- nector) NOTE: For details of wiring diagram, refer to "Wiring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-23. Read wire DC voltage Red—Black...
  • Page 98 2-25. E: 99. 4-way valve error (Outdoor unit) Operation indicator 9 time flash Timer indicator 9 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: 99 Indoor unit main PCB When the indoor heat exchanger temperature is compared with the room temperature, and either Heat exchanger temperature following condition is detected continuously two times,...
  • Page 99 Check point 3. Check the solenoid coil and 4-way valve NOTE: Refer solenoid coil and 4-way valve in "Service parts information" on page 03-71. • Solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value is 1.88 kΩ — 2.29 kΩ...
  • Page 100 2-26. E: A1. Discharge temperature error (Outdoor unit) Operation indicator 10 time flash Timer indicator 1 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: A1 Outdoor unit main PCB Protection stop by discharge temperature ≥ 110°C Detective actuator during compressor operation generated 2 times within Discharge temperature thermistor...
  • Page 101 Check point 5. Check the refrigerant amount Check the refrigerant leakage. ↓ Check point 6. Replace the main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. ↓ - (03-53) - 2-26. E: A1. Discharge temperature error (Outdoor unit) 2.
  • Page 102 2-27. E: A3. Compressor temperature error (Outdoor unit) (For 14 model) Operation indicator 10 time flash Timer indicator 3 time flash Indicator Indoor unit Economy indicator Continuous flash Error code E: A3 Outdoor unit main PCB Protection stop by compressor temperature ≥ 108°C Detective actuator during compressor operation generated 2 times within Compressor temperature thermistor...
  • Page 103 Check point 5. Check the refrigerant amount Check the refrigerant leakage. ↓ Check point 6. Replace the main PCB If check point 1 to 5 do not improve the symptom, replace the main PCB. ↓ - (03-55) - 2-27. E: A3. Compressor temperature error (Outdoor unit) (For 14 model) 2.
  • Page 104 3. Troubleshooting without error code 3-1. Indoor unit—No power Power supply failure Forecast of cause External cause 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 the installation manual or the DESIGN & TECHNICAL MANUAL.
  • Page 105 3-2. Outdoor unit—No power Power supply failure Forecast of cause External cause Electrical components defective Check point 1. Check installation condition • Is the circuit breaker on or off? • Check loose or removed connection cable. → If abnormal condition is found, correct it by referring to the installation manual or the DESIGN & TECHNICAL MANUAL.
  • Page 106 3-3. No operation (Power is on) Setting/ Connection failure Forecast of cause External cause Electrical components defective Check point 1. Check indoor and outdoor installation condition • Indoor unit: – Check incorrect wiring between indoor unit and remote controller. – Check if there is an open cable connection.
  • Page 107 3-4. No cooling/No heating Indoor unit error Outdoor unit error Forecast of cause Effect by surrounding environment Connection pipe/Connection wire failure Refrigeration cycle failure Check point 1. Check Indoor unit • Does Indoor unit fan run in the HIGH mode? •...
  • Page 108 NOTES: • Strainer normally does not have temperature difference between inlet and outlet as shown be- low. Pipe (In) Pipe (Out) • If there is a difference like shown below, there is a possibility of inside clogged. In this case, re- place the strainer.

  • Page 109: Abnormal Noise

    3-5. Abnormal noise Abnormal installation (indoor unit/outdoor unit) Forecast of cause Fan failure (indoor unit/outdoor unit) Compressor failure (outdoor) Diagnosis method when abnormal noise is occurred Abnormal noise is coming from Outdoor Abnormal noise is coming from Indoor unit. unit. (Check and correct followings) (Check and correct followings) ↓...
  • Page 110 3-6. Water leaking Erroneous installation Forecast of cause Drain hose failure Diagnosis method when water is spitting Diagnosis method when water leak occurs • Is main unit installed in stable condi- tion? Is the filter clogged? • Is main unit broken or deformed at the time of transportation or maintenance? ↓...

  • Page 111: E: 18. External Communication Error Between Indoor Unit And Wireless Lan Adapter

    4. Troubleshooting with error code (For wireless LAN adapter) 4-1. E: 18. External communication error between indoor unit and wireless LAN adapter Operation indicator 1 time flash Timer indicator 8 time flash Economy indicator Continuous flash Indoor unit Indicator Wireless LAN Flashing slowly indicator Error code...

  • Page 112: Network Communication Error Between Wireless Lan Router And Wireless Lan Adapter

    4-2. Network communication error between wireless LAN router and wireless LAN adapter Operation indicator No indication Timer indicator No indication Economy indicator No indication Indoor unit Indicator Wireless LAN Flashing slowly indicator Error code — Mobile app No indication Wireless LAN router When the not connection between wireless LAN adapter and wireless LAN router.
  • Page 113 Check point 4. Replace wireless LAN adapter. If check point 3 do not improve the symptom, replace the wireless LAN adapter and cancel the reg- istration of air conditioner on the Mobile app. After replacing the adapter, perform the pairing on the Mobile app. For the method of the Mobile app, refer to "Mobile app setting method"...

  • Page 114: E: 18. Communication Error

    4-3. E: 18. Communication error Operation indicator 1 time flash Timer indicator 8 time flash Economy indicator Continuous flash Indoor unit Indicator Wireless LAN Flashing slowly indicator Error code E: 18 Mobile app E: 18.1 Wireless LAN router When the external communication error between indoor unit and wireless LAN adapter and network Wireless LAN adapter PCB communication error between wireless LAN router and...
  • Page 115 Check point 4. Check the connection cable Check the connection cable on the wireless LAN router. -> If there is loose connector, open cable or mis-wiring, correct it. ↓ Check point 5. Check the connection status. Check the connection status to the Internet and wireless LAN router. ->...

  • Page 116: E: 18. Wireless Lan Adapter Non-Energized

    4-4. E: 18. Wireless LAN adapter non-energized Operation indicator 1 time flash Timer indicator 8 time flash Economy indicator Continuous flash Indoor unit Indicator Wireless LAN No indication indicator Error code E: 18 Mobile app No indication Indoor unit controller PCB When the voltage (DC 12 V) does not output from the Detective actuator controller PCB.

  • Page 117: Mobile App Setting Method

    4-5. Mobile app setting method ¢ Air conditioner delete method When the wireless LAN adapter is replaced, delete of all air conditioner is necessary on the mobile app. Launch the mobile app. Tap the icon to display the Setting screen. Tap the “Air conditioner editing”.
  • Page 118 Tap the air conditioner to be deleted. Tap the Delete button. Tap the OK button. Deletion of the air conditioner registered in the mobile app is completed. - (03-70) - 4-5. Mobile app setting method 4. Troubleshooting with error code (For wireless LAN adapter)

  • Page 119: Service Parts Information

    5. Service parts information 5-1. Compressor Diagnosis method of compressor (If outdoor unit LED displays error, refer to troubleshooting) Does not start up Stops soon after starting up Abnormal noise ↓ ↓ ↓ Check if vibration noise by Is there open or loose con- Is there open or loose con- loose bolt or contact noise of nection cable?

  • Page 120: Inverter Compressor

    5-2. Inverter compressor Check point 1. Check connection • Check terminal connection of compressor (loose or incorrect wiring) T(W) S(V) (BLACK) (WHITE) Main PCB R(U) (RED) • Check terminal connection of main PCB (loose or incorrect wiring) Main PCB W400(U) W401(V) W402(W) BLACK WHITE...

  • Page 121: Outdoor Unit Electronic Expansion Valve (Eev)

    5-3. Outdoor unit Electronic Expansion Valve (EEV) Check point 1. Check connections Check connection of connector. (Loose connector or open cable) NOTE: For details of wiring diagram, refer to "Wiring diagrams" in Chapter 2. TECHNICAL DATA AND PARTS LIST on page 02-23. Check point 2.
  • Page 122 Check point 6. Check strainer • Strainer normally does not have temperature difference between inlet and outlet as shown be- low. Pipe (In) Pipe (Out) • If there is a difference like shown below, there is a possibility of inside clogged. In this case, replace the strainer.

  • Page 123: Indoor Unit Fan Motor

    5-4. 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.

  • Page 124: Outdoor Unit Fan Motor

    5-5. Outdoor unit fan motor Check point 1. Check rotation of fan Rotate the fan by hand when operation is off. (Check if fan is caught, dropped off or locked motor) → If fan or bearing is abnormal, replace it. Check point 2.

  • Page 125: 4-Way Valve Coil (Solenoid Coil)/4-Way Valve

    5-7. 4-way valve coil (solenoid coil)/4-way valve Check point 1. Check connection • Check the connection of connector P60. BLACK SOLENOID COIL BLACK ↓ Check Point 2 : Check solenoid coil Remove P60 from PCB and check the resistance value of coil. Resistance value ≈...

  • Page 126: Thermistor Resistance Values

    6. Thermistor resistance values 6-1. Indoor unit ¢ Room temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -10.0 58.25 0.73 -5.0 44.03 0.93 33.62 1.15 25.93 1.39 10.0 20.18 1.66 15.0 15.84 1.94 20.0 12.54 2.22 25.0 10.00 2.50 30.0 8.04 2.77 35.0...

  • Page 127: Outdoor Unit

    6-2. Outdoor unit ¢ Discharge temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 984.49 0.03 -25.0 709.67 0.05 -20.0 518.22 0.06 -15.0 383.06 0.09 -10.0 286.42 0.11 -5.0 216.49 0.15 165.33 0.19 127.48 0.25 10.0 99.21 0.31 15.0 77.88 0.39 20.0 61.64...
  • Page 128 ¢ Heat exchanger temperature thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 95.57 0.24 -25.0 68.89 0.32 -20.0 50.31 0.43 -15.0 37.19 0.57 -10.0 27.81 0.73 -5.0 21.02 0.92 16.05 1.14 12.38 1.39 10.0 9.63 1.65 15.0 7.56 1.93 20.0 5.98 2.21 25.0...
  • Page 129 ¢ Compressor thermistor Temperature (°C) Resistance (kΩ) Voltage (V) -30.0 1,013.11 0.06 -25.0 729.09 0.09 -20.0 531.56 0.12 -15.0 392.31 0.16 -10.0 292.91 0.21 -5.0 221.09 0.28 168.60 0.36 129.84 0.46 10.0 100.91 0.57 15.0 79.12 0.71 20.0 62.55 0.86 25.0 49.84 1.03...
  • Page 130 - (03-82) - 6-2. Outdoor unit 6. Thermistor resistance values...

  • Page 131: Control And Functions

    4. CONTROL AND FUNCTIONS 2025.03.19 SR_CH04_AS138EG_03...
  • Page 132 CONTENTS 4. CONTROL AND FUNCTIONS 1. Rotation number control of compressor...........04-1 1-1. Cooling operation ......................04-1 1-2. Heating operation ......................04-3 1-3. Dry operation ........................04-4 1-4. Rotation number of compressor at normal start-up ............04-5 1-5. Limitation of compressor rotation number by outdoor temperature.........04-6 2.
  • Page 133 CONTENTS (continued) 8-7. Low outdoor temperature protection................04-32 8-8. High temperature and high pressure release control ............04-33...

  • Page 135: Rotation Number Control Of Compressor

    1. Rotation number control of compressor 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 rotation number of the compressor. •...
  • Page 136 • 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 137: 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 rota- tion number of compressor. • If the room temperature is 6.0°C lower than a set temperature, the operation rotation number of compressor will attain to maximum performance.

  • Page 138: Dry Operation

    1-3. Dry operation The rotation number of compressor 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 139: Rotation Number Of Compressor At Normal Start-Up

    1-4. Rotation number of compressor at normal start-up ¢ Models: AOHG09KMCEN and AOHG12KMCEN Rotation number of compressor soon after starting is controlled as below. Rotation number V Rotation number IV Rotation number III Rotation number II Rotation number I Time 1 Time 2 Time 3 Time 4...

  • Page 140: Limitation Of Compressor Rotation Number By Outdoor Temperature

    1-5. Limitation of compressor rotation number by outdoor temperature The minimum rotation number of compressor 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 Unit: rps Limitation of compressor...
  • Page 141 • Heating mode F zone 19°C E zone 5°C D zone 0°C C zone -15°C B zone -25°C A zone Unit: rps Limitation of compressor Model name Outdoor temperature zone rotation number A zone B zone C zone AOHG09KMCEN D zone E zone F zone A zone...

  • Page 142: 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, 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 143: Operation Flow Chart

    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 144: 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 ASHG09KMCEN-B ASHG12KMCEN-B ASHG14KMCEN-B POWERFUL 1,310 1,340 1,400 HIGH 1,240 1,270 1,330 MED+ 1,120 1,130...
  • Page 145 ¢ 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 146 • Powerful operation Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C 37°C HIGH 39°C 34°C 37°C 32°C Cool air prevention 30°C 28°C S-LOW 7 minutes later: Indoor heat exchanger temperature rises Indoor heat exchanger POWERFUL temperature drops 42°C 37°C HIGH...

  • Page 147: 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: AOHG09KMCEN Fan speed is defined by outdoor temperature and compressor frequency. •...
  • Page 148  Model: AOHG12KMCEN 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 Unit: rpm Cooling Cooling or dry at low outdoor temp.
  • Page 149  Model: AOHG14KMCEN 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 Unit: rpm Cooling Cooling or dry at low outdoor temp.

  • Page 150: Louver Control

    4. Louver control 4-1. Horizontal louver control Each time the button is pressed, the airflow direction range will change as below: Side view • Remote controller display is not changed. • Up/down airflow direction is set automatically as shown, in accordance with the type of operation selected.

  • Page 151: Swing Operation

    4-3. Swing operation • To select up/down airflow swing operation When the swing signal is received, the horizontal louver starts to swing. – Swinging range • Cooling mode/dry mode/fan mode (1 to 3): 1 ↔ 4 • Heating mode/fan mode (4 to 6): 3 ↔ 6 –...

  • Page 152: 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 153: Sleep Timer

    ¢ 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 154: Wired Remote Control

    5-2. Wired remote control Temperature On/Off timer Program timer Sleep timer Weekly timer Setback 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 155 ¢ 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 156: Temperature Setback Timer

    ¢ Temperature Setback Timer • The temperature setback timer only changes the set temperature for 7 days, it cannot be used to start or stop air conditioner operation. • The temperature setback timer can be set to operate up to two times per day but only one temperature setting can be used.

  • Page 157: 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 158: 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 159: 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 160: Forced Cooling Operation

    7-3. Forced cooling operation The outdoor unit may not operate depending on the room temperature. When FORCED COOLING OPERATION button is pressed more than 10 seconds, forced cooling operation starts as shown in the table below. Operation mode Cooling Fan mode HIGH Timer mode Continuous (no timer setting available)

  • Page 161: Powerful Operation

    7-6. 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. Rotation number of compressor Maximum Fan mode POWERFUL Cooling Vertical airflow direction louver setting Heating...

  • Page 162: Electronic Expansion Valve Control

    7-9. 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 below. Operation mode Pulse range Cooling/dry mode Between 52 and 480 pulses Heating mode NOTE: At the time of supplying the power to the outdoor unit, the initialization of the electronic ex- pansion valve is operated (528 pulses are input to the closing direction).

  • Page 163: Base Pan Heater Control

    7-13. Base pan heater control The base pan heater operates as follows, depending on the outdoor temperature and operating con- dition. Operation mode Heating Heating Defrost 15 min Pattern X Pattern Z Pattern X Base pan heater control Pattern Y Control pattern Heater Off Ta ≥...

  • Page 164: 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 rotation number of compressor is decreased as the table below, and it continues to decrease until the discharge tem- perature becomes lower than the trigger condition.

  • Page 165: Current Release Control

    8-3. Current release control The rotation number of compressor is controlled so that the outdoor unit input current does not ex- ceeds current limit value set according to the outdoor temperature. The rotation number of compressor returns according to the operation mode, when the current be- comes lower than the release value.

  • Page 166: Cooling Pressure Over-Rise Protection

    8-4. Cooling pressure over-rise protection When the outdoor unit heat exchanger temperature reaches trigger condition below, the compressor is stopped and trouble display is performed. Trigger condition 65°C 8-5. Compressor temperature protection When the compressor temperature sensor detects higher than the trigger condition below, the com- pressor is stopped.

  • Page 167: Operation

    8-8. High temperature and high pressure release control The compressor is controlled as follows. ¢ Models: AOHG09KMCEN, AOHG12KMCEN, and AOHG14KMCEN Indoor unit heat exchanger Indoor unit heat exchanger temperature rises temperature drops 63°C Zone A 55°C 53°C Zone B 50°C Zone C Zone D Stable zone...
  • Page 168 - (04-34) - 8-8. High temperature and high pressure release control 8. Various protections...
  • Page 169 5. FIELD WORKING 2024.06.11 SR_CH05_AS138EG_01...
  • Page 170 CONTENTS 5. FIELD WORKING 1. Function settings ..................05-1 1-1. Function settings by using remote controller ..............05-1 1-2. Custom code setting for wireless remote controller ............05-8 2. External input and output................05-9 2-1. External input........................05-10 2-2. External output ......................05-12 2-3. Setting of external input and output ................05-13 2-4.

  • Page 171: Function Settings

    1. Function settings To adjust the functions of this product according to the installation environment, various types of function settings are available. NOTE: Incorrect settings can cause a product malfunction. 1-1. Function settings by using remote controller Some function settings can be changed on the remote controller. After confirming the setting proce- dure and the content of each function setting, select appropriate functions for your installation envi- ronment.
  • Page 172 NOTES: • The air conditioner custom code is set to prior to shipment. • If you do not know the air conditioner custom code setting, try each of the custom codes ( → → → ) until you find the code that operates the air conditioner. - (05-2) - 1-1.

  • Page 173: Contents Of Function Setting

    ¢ Contents of function setting Each function setting listed in this section is adjustable in accordance with the installation environ- ment. NOTE: Setting will not be changed if invalid numbers or setting values are selected.  Function setting list Function no. Functions Remote controller address setting Filter sign...

  • Page 174: Filter Sign

    2) Filter sign Select appropriate intervals for displaying the filter sign on the indoor unit according to the estimated amount of dust in the air of the room. If the indication is not required, select "No indication" (03). Function number Setting value Setting description Factory setting...

  • Page 175: Auto Restart

    4) Room temperature control for wired remote controller sensor Depending on the installed environment, correction of the wire remote temperature sensor may be required. Select the appropriate control setting according to the installed environment. To change this setting, set Function 42 to Both “01”. Ensure that the Thermo Sensor icon is displayed on the remote controller screen.
  • Page 176 7) Cold air prevention This setting is to disable the cold air prevention function during heating operation. When disabled, the fan setting will always follow the setting on the remote controller. (Excluding defrost mode) Function number Setting value Setting description Factory setting Enable ♦...
  • Page 177 11) Indoor unit fan control for energy saving for cooling Enables or disables the power-saving function by controlling the indoor unit fan rotation when the outdoor unit is stopped during cooling operation. Function number Setting value Setting description Factory setting Disable Enable Remote controller...

  • Page 178: Custom Code Setting For Wireless Remote Controller

    1-2. Custom code setting for wireless remote controller To interconnect the air conditioner and the wireless remote controller, assignment of the custom code for the wireless remote controller is required. NOTE: Air conditioner cannot receive a signal if the air conditioner has not been set for the custom code.

  • Page 179: External Input And Output

    2. External input and output External Input and Output PCB SW301 SW302 Rotary switch CN314 CN313 CN312 CN311 CN310 CN308 To CN6 on Indoor unit PCB Connecting point Input/Output Function Input select Input signal CN313 Operation/Stop Edge/Pulse CN314 Forced stop Dry contact/Apply Input voltage...

  • Page 180: External Input

    2-1. External input With using external input function, some functions on this product can be controlled from an external device. • “Operation/Stop” mode or "Forced stop" mode can be selected with function setting of indoor unit. • A twisted pair cable should be used. Maximum length of cable is 150 m. •...

  • Page 181: Input Signal Type

    ¢ Input signal type The input signal type can be selected. Signal type (edge or pulse) can be switched by the DIP switch 2 (SW302) on the External Input and Output PCB. Edge The width of pulse must be longer than 200 msec. Pulse NOTE: The input signal supports the following switch type: •...

  • Page 182: External Output

    2-2. External output Use an external output cable with appropriate external dimension, depending on the number of ca- bles to be installed. ¢ External Input and Output PCB • A twisted pair cable should be used. Maximum length of cable is 25 m. •...

  • Page 183: Setting Of External Input And Output

    2-3. Setting of external input and output Switch setting Input Output Rotary SW302 CN313 CN314 CN310 CN311 CN312 switch Edge Operation/Stop Not available Indoor unit fan Operation/Stop Error status operation status Pulse Operation Stop Forced Indoor unit fan Not available Error status Not available thermostat off...

  • Page 184: Details Of Control Input Function

    2-4. Details of control input function ¢ Operation/Stop mode 1 • In the case of "Edge" input External Input and Output PCB Function External input Input signal Command setting Rotary SW302 switch Off → On Operation External Input and 46-00 Edge CN313 Output PCB...

  • Page 185: Function Setting

    ¢ Forced stop • In the case of "Edge" input External Input and Output PCB Function External input Input signal Command setting Rotary SW302 switch Forced stop Off → On (R.C. disabled) External Input and 46-02 Edge CN313 Output PCB Normal On →...

  • Page 186: Operation/Stop Mode

    ¢ Operation/Stop mode 2 • In the case of “Edge” input External Input and Output PCB Function External input Input signal Command setting Rotary SW302 switch Operation Off → On (R.C. enabled) External Input and 46-03 Edge CN313 Output PCB Stop On →...

  • Page 187: Forced Thermostat Off

    ¢ Forced thermostat off External Input and Output External input Input signal Command Rotary switch Off → On Thermostat off External Input and 2, B, C, D CN313 Output PCB On → Off Normal operation CN313 Compressor Room temp. Set temp. - (05-17) - 2-4.

  • Page 188: Details Of Control Output Function

    2-5. Details of control output function ¢ Operation status External Input and Output External output Output signal Status Rotary switch Off → On Operation External Input and 1, B, C, D CN310 Output PCB On → Off Stop The output is low when the unit is stopped. Indoor unit operation CN310 ¢...

  • Page 189: External Heater Output

    ¢ External heater output External Input and Function Output PCB External output Output signal Control setting Rotary switch Off → On Heater on 60-11 — Output of indoor unit CN47 On → Off Heater off Off → On Heater on External Input and —...

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