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Error Code Search
ERROR CODE SEARCH
By checking the error code, you are able to identify the status and the issue of the air conditioner/air conditioning system.
The Error Code Search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.
Malfunction Code: A0
Products: Sky Air, VRV, Packaged Air
Malfunction:
External protection device activated
Possible Cause:
• External protection device connected to the terminal strip T1-T2 of indoor unit is activated
Malfunction Code: A1
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of indoor unit PCB
Possible Cause:
• Malfunction due to noise.
• Defect of indoor unit PCB
Malfunction Code: A3
Products: Room Air, Sky Air, VRV
Malfunction:
Malfunction of drain level control system
Possible Cause:
• Drain piping clogging, improper drain piping work.
• Defect of drain pump. Defect of float switch
Malfunction Code: A4
Products: Applied Product
Malfunction:
Malfunction of freezing protection
Possible Cause:
• Shortage of water volume.
• Low Water Temperature Setting.
• Defect of 26WL.
• Defect of water temperature thermistor
Malfunction Code: A5
Products: Room Air
High pressure control in heating, freeze-up protection control in cooling
Possible Cause:
• Clogged air filter of indoor unit and short-circuit.
• Defect of indoor unit heat exchanger thermistor
Malfunction Code: A6
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Fan motor locked, overload, overcurrent
Possible Cause:
• Defect of connector contact.
• Defect of fan motor.
• Defect of indoor unit PCB
Malfunction Code: A7
Products: Sky Air, VRV
Malfunction:
Malfunction of swing flap motor
Possible Cause:
• Failure of swing flap motor.
• Defect of indoor unit PCB.
• Jammed swing mechanism/blade
Malfunction Code: A8
Products: Sky Air, VRV
Malfunction:
Malfunction of power supply
Possible Cause:
• Overcurrent of AC input.
• Defect of power supply voltage
Malfunction Code: A9
Products: VRV, Packaged Air
Malfunction:
Malfunction of electronic expansion valve drive
Possible Cause:
• Defect of electronic expansion valve coil.
• Defect of indoor unit PCB.
• Defect of connector contact
Malfunction Code: AA
Products: Applied Product
Malfunction:
Heater overheat
Possible Cause:
• 26WH is activated
Malfunction Code: AH
Products: Room Air, Sky Air, VRV
Malfunction:
Malfunction of dust collector of air cleaner
Possible Cause:
• Defect of dust collecting element.
• Defect of high voltage power supply unit.
• Stained insulator part.
• Defect of indoor unit PCB
Malfunction Code: AJ
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of capacity setting (Indoor unit PCB)
Possible Cause:
• Capacity setting adaptor is not installed when replacing PCB.
• Defect of indoor unit PCB
Malfunction Code: C1
Products: Sky Air, VRV
Malfunction:
Failure of transmission (between indoor unit PCB and fan PCB)
Possible Cause:
• Defect of transmission of fan motor control driver
Malfunction Code: C4
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of liquid pipe thermistor for heat exchanger
Possible Cause:
• Defect of connector contact.
• Defect of liquid pipe thermistor for heat exchanger
Malfunction Code: C5
Products: Room Air, Sky Air, Packaged Air
Malfunction:
Malfunction of gas pipe thermistor for heat exchanger
Possible Cause:
• Defect of connector contact.
• Defect of gas pipe thermistor for heat exchanger
Malfunction Code: C6
Products: Sky Air, VRV
Malfunction:
Malfunction of fan motor control driver
Possible Cause:
• Defect of fan motor sensor system.
• Defect of fan motor control driver
Malfunction Code: C7
Products: Room Air
Malfunction:
Front panel driving motor fault
Possible Cause:
• Defect of front panel driving motor.
• Defect of limit switch
Malfunction Code: C9
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of suction air thermistor
Possible Cause:
• Defect of connector contact.
• Defect of thermistor for suction air
Malfunction Code: CA
Products: VRV, Packaged Air
Malfunction:
Malfunction of discharge air thermistor
Possible Cause:
• Defect of connector contact.
• Defect of thermistor for discharge air
Malfunction Code: CC
Products: Room Air, Sky Air
Malfunction:
Malfunction of humidity sensor system
Possible Cause:
• Defect of connector contact.
• Defect of humidity sensor
Malfunction Code: CJ
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of thermostat sensor in remote controller
Possible Cause:
• Defect of remote controller thermistor.
• Malfunction due to noise.
• Defect of remote controller PCB
Malfunction Code: E0
Products: Sky Air, VRV, Applied Product
Malfunction:
Protection devices actuated (unified)
Possible Cause:
• Protection device connected to outdoor PCB actuated.
• Defect of protection device connector contact
Malfunction Code: E1
Products: Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Defect of outdoor unit PCB
Possible Cause:
• Malfunction due to noise.
• Defect of outdoor unit PCB
Malfunction Code: E3
Products: Sky Air, VRV, Packaged Air
Malfunction:
Actuation of high pressure switch (HPS)
Possible Cause:
• Dirty outdoor unit heat exchanger and suction filter.
• Defect of HPS.
• Clogged refrigerant piping.
• Defect of connector contact
Malfunction Code: E4
Products: Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Actuation of low pressure switch (LPS)
Possible Cause:
• Clogged refrigerant piping.
• Defect of connecting connector.
• Shortage of gas.
• Defect of outdoor unit PCB
Malfunction Code: E5
Products: Room Air, Applied Product
Malfunction:
Overheat of inverter compressor motor
Possible Cause:
• Shortage of refrigerant amount.
• Leakage of four way valve.
• Defect of connector contact
Malfunction Code: E5
Products: Sky Air, VRV, Packaged Air
Malfunction:
Inverter compressor motor lock
Possible Cause:
• Inverter compressor lock.
• Incorrect wiring
Malfunction Code: E6
Products: Sky Air, VRV, Packaged Air
Malfunction:
STD compressor motor overcurrent/lock
Possible Cause:
• Closed stop valve STD compressor lock
Malfunction Code: E6
Products: Applied Product
Malfunction:
System No.1 Compressor overcurrent
Possible Cause:
• Defect of EXP valve.
• Defect of compressor.
• Shortage of refrigerant amount
Malfunction Code: E7
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of outdoor unit fan motor
Possible Cause:
• Faulty contact of fan motor connector.
• Defect of fan motor.
• Defect of fan motor driver
Malfunction Code: E8
Products: Room Air
Malfunction:
Overcurrent of inverter compressor
Possible Cause:
• Defect of compressor.
• Defect of outdoor unit PCB.
• Defect of inverter main circuit capacitor.
• Defect of power transistor
Malfunction Code: E9
Products: Room Air
Malfunction:
Malfunction of electronic expansion valve coil
Possible Cause:
• Defect of electronic expansion valve.
• Defect of outdoor unit PCB.
• Defect of connector contact
Malfunction Code: EA
Products: Room Air
Malfunction:
Malfunction of four way valve
Possible Cause:
• Defect of four way valve.
• Defect of outdoor unit PCB.
• Shortage of gas.
• Defect of thermistor
Malfunction Code: EC
Products: VRV
Malfunction:
Malfunction of entering water temperature
Possible Cause:
• Malfunction of cooling water temperature.
• Defect of thermistor.
• Defect of outdoor unit PCB
Malfunction Code: EF
Products: VRV
Malfunction:
Malfunction of thermal storage unit
Possible Cause:
• Defect of electronic expansion valve of thermal storage unit.
• Defect of thermal storage PCB
Malfunction Code: F3
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of discharge pipe temperature
Possible Cause:
• Shortage of gas.
• Defect of connector contact.
• Clogged refrigerant piping.
• Defect fo discharge pipe thermistor
Malfunction Code: F6
Products: VRV, Packaged Air
Malfunction:
Abnormal high pressure in cooling
Possible Cause:
• Defect of outdoor unit fan motor.
• Defect of heat exchanger thermistor.
• Defect of electronic expansion valve.
• Defect of outdoor unit PCB
Malfunction Code: H0
Products: Room Air
Malfunction:
Malfunction of sensor system of compressor
Possible Cause:
• Harness is disconnected, or defective connection.
• Defect of PCB
Malfunction Code: H1
Products: Room Air
Malfunction:
Malfunction of humidifier unit damper
Possible Cause:
• Defect of limit switch.
• Defect of damper
Malfunction Code: H3
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of high pressure switch (HPS)
Possible Cause:
• Defect of high pressure switch.
• Defect of connector contact.
• Broken wire.
• Defect of outdoor unit PCB
Malfunction Code: H4
Products: Sky Air, VRV
Malfunction:
Malfunction of low pressure switch (LPS)
Possible Cause:
• Defect of low pressure switch.
• Defect of connector contact.
• Broken wire.
• Defect of outdoor unit PCB
Malfunction Code: H5
Products: Room Air
Malfunction:
Malfunction of compressor motor overload thermistor
Possible Cause:
• Defect of connector contact.
• Defect of compressor motor overload thermistor
Malfunction Code: H6
Products: Room Air
Malfunction:
Malfunction of position detection sensor
Possible Cause:
• Faulty contact of compress or cable.
• Defect of compressor.
• Defect of outdoor unit PCB
Malfunction Code: H7
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of outdoor fan motor signal
Possible Cause:
• Faulty contact of fan wiring.
• Defect of fan motor.
• Defect of fan motor driver
Malfunction Code: H8
Products: Room Air
Malfunction:
Malfunction of compressor input (CT) system
Possible Cause:
• Defect of power transistor.
• Defect of reactor.
• Faulty wiring of inverter system.
• Defect of outdoor unit PCB
Malfunction Code: H9
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of outdoor air thermistor
Possible Cause:
• Defect of connector contact.
• Defect of thermistor for outdoor air
Malfunction Code: HC
Products: Room Air, Sky Air, VRV,Packaged Air, Applied Product
Malfunction:
Malfunction of (hot) water temperature thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of thermistor for water temperature
Malfunction Code: HF
Products: Sky Air, VRV
Malfunction:
Alarm in thermal storage unit with ice
Possible Cause:
• Thermal storage group defective wiring.
• Defect of setting.
• Excess of thermal storage tank numbers
Malfunction Code: HJ
Products: Sky Air, VRV
Malfunction:
Malfunction of thermal storage tank water level
Possible Cause:
• Low water level.
• Water level detecting sensor failure.
• Defect of switch setting.
• Defect of connector contact
Malfunction Code: J1
Products: Sky Air, VRV
Malfunction:
Malfunction of pressure sensor
Possible Cause:
• Defect of pressure sensor connector contact.
• Defect of pressure sensor.
• Defect of outdoor unit PCB
Malfunction Code: J2
Products: Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of current sensor of compressor
Possible Cause:
• Defect of current sensor.
• Defect of outdoor unit PCB.
• Defect of compressor
Malfunction Code: J3
Products: Room Air, Sky Air, VRV,Packaged Air, Applied Product
Malfunction:
Malfunction of discharge pipe thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of discharge pipe thermistor
Malfunction Code: J4
Products: Room Air
Malfunction:
Malfunction of low pressure equivalent saturated temperature sensor system
Possible Cause:
• Defect of connector contact. Defect of thermistor. Defect of outdoor unit PCB (Multi-split, Super-multi )
Malfunction Code: J5
Products: Room Air, Sky Air, VRV,Packaged Air, Applied Product
Malfunction:
Malfunction of suction pipe thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of suction pipe thermistor
Malfunction Code: J6
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of heat exchanger thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of heat exchanger thermistor
Malfunction Code: J7
Products: Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of liquid pipe thermistor (Refrigerant circuit and others)
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of liquid pipe thermistor
Malfunction Code: J8
Products: Sky Air
Malfunction:
Malfunction of liquid pipe thermistor (Refrigerant circuit and others)
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of liquid pipe thermistor
Malfunction Code: J9
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of gas pipe thermistor (Refrigerant circuit and others)
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of gas pipe thermistor
Malfunction Code: JA
Products: Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of high pressure sensor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of gas pipe thermistor
Malfunction Code: JC
Products: Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of low pressure sensor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of low pressure sensor
Malfunction Code: JE
Products: VRV
Malfunction:
Malfunction of sub-tank thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of sub-tank thermistor
Malfunction Code: JF
Products: VRV
Malfunction:
Malfunction of oil temperature thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of heat exchanger thermistor
Malfunction Code: JH
Products: VRV
Malfunction:
Malfunction of oil temperature thermistor
Possible Cause:
• Defect of connector contact.
• Defect of outdoor unit PCB.
• Defect of oil temperature thermistor
Malfunction Code: L0
Products: VRV
Malfunction:
Malfunction of inverter system
Possible Cause:
Malfunction Code: L1
Products: Sky Air, VRV
Malfunction:
Malfunction of inverter PCB
Possible Cause:
• Defect of compressor wiring.
• Blown fuse.
• Defect of outdoor unit fan motor.
• Defect of inverter PCB
Malfunction Code: L3
Products: Room Air
Malfunction:
Electrical box temperature rise
Possible Cause:
• Fin temperature rise due to short-circuit.
• Defect of power transistor.
• Defect of outdoor unit fan.
• Defect of outdoor unit PCB
Malfunction Code: L4
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of inverter radiating fin temperature rise
Possible Cause:
• Fin temperature rise due to short-circuit.
• Defect of fin thermistor
Malfunction Code: L5
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Inverter instantaneous overcurrent (DC)
Possible Cause:
• Closed stop valve.
• Defect of compressor
Malfunction Code: L6
Products: VRV
Malfunction:
Inverter instantaneous overcurrent (AC)
Possible Cause:
• Overcharge of refrigerant amount.
• Defect of compressor.
• Shortage of power supply capacity.
• Defect of inverter unit
Malfunction Code: L8
Products: Sky Air, VRV, Packaged Air
Malfunction:
Overcurrent of inverter compressor
Possible Cause:
• Abnormal high pressure rise due to clogged refrigerant circuit and others.
• Defect of compressor
Malfunction Code: L9
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of inverter compressor startup
Possible Cause:
• Faulty of pressure equalization.
• Defect of compressor wiring.
• Defect of compressor
Malfunction Code: LA
Products: VRV
Malfunction:
Malfunction of power transistor
Possible Cause:
• Defect of power transistor.
• Defect of inverter PCB.
• Defect of compressor
Malfunction Code: LC
Products: Room Air
Malfunction:
Malfunction of transmission between outdoor unit PCB and micro-computer
Possible Cause:
• Defect of grounding connection. Defect of outdoor unit PCB. Malfunction due to noise
Malfunction Code: LC
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of transmission between control and inverter PCB
Possible Cause:
• Defect of connector contact.
• Malfunction due to noise.
• Defect of inverter PCB.
• Defect of outdoor unit control PCB
Malfunction Code: P0
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of transmission between control and inverter PCB
Possible Cause:
• Shortage of refrigerant.
• Clogged refrigerant piping
Malfunction Code: P1
Products: Sky Air, VRV,Packaged Air, Applied Product
Malfunction:
Power voltage imbalance, open phase
Possible Cause:
• Open phase.
• Voltage imbalance between phases.
• Faulty main circuit capacitor.
• Defect of wiring contact
Malfunction Code: P2
Products: VRV, Packaged Air
Malfunction:
Automatic refrigerant charge operation stop
Possible Cause:
• Closed stop valve.
• Closed valve of refrigerant tank
Malfunction Code: P3
Products: Room Air, Sky Air
Malfunction of thermistor in electrical box
Possible Cause:
• Electrical box temperature rise (ambient temperature rise).
• Defect of fin thermistor.
• Defect of outdoor unit PCB
Malfunction Code: P4
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of radiating fin temperature sensor
Possible Cause:
• Defect of radiating fin thermistor.
• Defect of wiring contact.
• Defect of outdoor unit PCB
Malfunction Code: P8
Products: VRV, Packaged Air
Malfunction:
Heat exchanger freezing protection during automatic refrigerant charging
Possible Cause:
• (Close the refrigerant cylinder. Start again from step 1.)
Malfunction Code: P9
Products: VRV, Packaged Air
Malfunction:
Automatic refrigerant charge operation completed
Possible Cause:
•
Malfunction Code: P9
Products: Room Air
Malfunction:
Malfunction of fan motor (humidifier unit)
Possible Cause:
• Defect of fan motor. Broken relay harness.
• Defect of outdoor unit PCB.
• Defect of connector contact
Malfunction Code: PA
Products: Room Air
Broken wire of heater (humidifier unit)
Possible Cause:
•Defect of heater unit.
• Defect of outdoor unit PCB.
• Defect of thermistor
Malfunction Code: PA
Products: VRV, Packaged Air
Malfunction:
Empty refrigerant cylinder during automatic refrigerant charging
Possible Cause:
• Refrigerant cylinder of master unit is empty
Malfunction Code: PC
Products: VRV, Packaged Air
Malfunction:
Empty refrigerant cylinder during automatic refrigerant charging
Possible Cause:
• Refrigerant cylinder of slave unit 2 is empty
Malfunction Code: PE
Products: VRV, Packaged Air
Malfunction:
Automatic refrigerant charge operation nearly completed
Possible Cause:
•
Malfunction Code: PH
Products: Room Air
Malfunction:
Malfunction of temperature (humidifier unit)
Possible Cause:
• Defect of heater unit.
• Defect of thermistor.
• Defect of connector contact.
• Defect of outdoor unit PCB
Malfunction Code: PH
Products: VRV, Packaged Air
Malfunction:
Empty refrigerant cylinder during automatic refrigerant charging
Possible Cause:
• Refrigerant cylinder of slave unit 1 is empty
Malfunction Code: PJ
Products: Sky Air
Malfunction:
Malfunction of capacity setting (Outdoor unit PCB)
Possible Cause:
• Capacity setting adaptor is not installed.
• Defect of outdoor unit PCB.
• Improper capacity setting adaptor
Malfunction Code: PJ
Products: VRV, Packaged Air
Malfunction:
Improper combination between inverter and fan driver
Possible Cause:
• Mistake of inverter PCB.
• Mistake of control PCB.
• Mistake of inverter fan PCB
Malfunction Code: PJ
Products: VRV, Packaged Air
Malfunction:
Improper combination between inverter and fan driver
Possible Cause:
• Mistake of inverter PCB.
• Mistake of control PCB.
• Mistake of inverter fan PCB
Malfunction Code: U0
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Shortage of refrigerant
Possible Cause:
• Shortage of refrigerant. Closed stop valve. Clogged refrigerant piping
Malfunction Code: U1
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Reverse phase, open phase
Possible Cause:
• Reverse phase, open phase of power wiring. Wrong wiring. Defect of outdoor unit PCB
Malfunction Code: U2
Products: Room Air, Sky Air, VRV, Packaged Air
Malfunction:
Defect of power supply voltage or instantaneous power failure
Possible Cause:
• Defect of power supply voltage. Defect of wiring contact. Instantaneous power failure
Malfunction Code: U3
Products: VRV, Packaged Air
Malfunction:
Check operation not executed
Possible Cause:
• Check operation not executed
Malfunction Code: U3
Products: Applied Product
Malfunction:
Malfunction of transmission
Possible Cause:
• Malfunction due to noise. Wrong wiring. Defect of outdoor unit PCB
Malfunction Code: U4
Products: Room Air, Sky Air, VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of transmission between indoor and outdoor unit
Possible Cause:
• Defect or indoor-outdoor transmission wiring. Malfunction due to noise. Defect of indoor unit PCB and outdoor unit PCB
Malfunction Code: U5
Products: Room Air, Sky Air, VRV, Packaged Air, HRV, Applied Product
Malfunction:
Malfunction of transmission between indoor unit and remote controller
Possible Cause:
• Defect of remote controller wiring Defect of indoor unit PCB. Malfunction due to noise. Defect of remote controller main/sub setting
Malfunction Code: U6
Products: VRV
Malfunction:
Malfunction of transmission between indoor units
Possible Cause:
• Faulty wiring Malfunction due to noise. Defect of indoor unit PCB
Malfunction Code: U7
Products: Room Air
Malfunction:
verter and fan drivImproper combination between iner
Possible Cause:
• Mistake of inverter PCB.
• Mistake of control PCB.
• Mistake of inverter fan PCB
Malfunction Code: U7
Products: VRV, Packaged Air, Applied Product
Malfunction:
Malfunction of transmission between outdoor units
Possible Cause:
• Defect of wiring between outdoor units.
• Defect of outdoor unit switch setting.
• Defect of wiring between outdoor – thermal storage units
Malfunction Code: U8
Products: Sky Air, VRV, Packaged Air, HRV
Malfunction:
Malfunction of transmission between remote controllers
Possible Cause:
•Defect of remote controller main/sub setting.
• Defect of remote controller wiring.
• Defect of remote controller PCB
Malfunction Code: U9
Products: VRV, Packaged Air
Malfunction:
Malfunction of transmission (other system)
Possible Cause:
• Defect of communication between other indoor unit and outdoor unit.
• Other indoor unit electronic expansion valve failure
Malfunction Code: UA
Products: Room Air
Malfunction:
Defect of indoor/outdoor power supply
Possible Cause:
• Wrong model connections.
• Wrong PCB connected.
• Improper power supply.
• Defect of PCB
Malfunction Code: UA
Products: VRV, Packaged Air, HRV
Malfunction:
Improper combination of indoor and outdoor units
Possible Cause:
• Excess of connected indoor units.
• Uncanceled service mode.
• Malfunction of field setting.
• Defect of outdoor unit PCB
Malfunction Code: UA
Products: Applied Product
Malfunction:
Remote temperature setting wire disconnection
Possible Cause:
• Remote temperature setting wire disconnection.
• Defect of connector contact
Malfunction Code: UC
Products: Sky Air, VRV, Packaged Air
Malfunction:
Malfunction of setting of centralized controller address
Possible Cause:
• Address duplication of centralized controller
Malfunction Code: UE
Products: Sky Air, VRV, Packaged Air, HRV, Applied Product
Malfunction:
Malfunction of transmission between indoor unit and centralized controller
Possible Cause:
• Malfunction of wiring between indoor unit and centralized controller.
• Defect of setting of group number.
• Defect of indoor unit PCB
Malfunction Code: UF
Products: Sky Air, VRV, Packaged Air
Malfunction:
Wiring and piping mismatch
Possible Cause:
• Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units
Malfunction Code: UJ
Products: VRV, Applied Product
Malfunction:
Malfunction of transmission (Accessory devices)
Possible Cause:
• Defect of accessory devices.
• Faulty wiring
Malfunction Code: M1
Products: Room Air, Sky Air, VRV, Packaged Air, HRV, Applied Product
Malfunction:
Malfunction of centralized remote controller PCB
Possible Cause:
• Defect of centralized remote controller PCB
Malfunction Code: M8
Products: Room Air, Sky Air, VRV, Packaged Air, HRV, Applied Product
Malfunction:
Malfunction of transmission between optional controllers for centralized control
Possible Cause:
• Other centralized control power disconnection.
• Defect of transmission wiring.
• Centralized control reset switch ON.
• Central remote controller address change
Malfunction Code: MA
Products: Room Air, Sky Air, VRV, Packaged Air, HRV, Applied Product
Improper combination of optional controllers for centralized control
Possible Cause:
• Improper combination of optional controllers for centralized control.
• More than one master controller is connected.
• Faulty setting of centralized control.
• Defect of centralized
Malfunction Code: MC
Products: Room Air, Sky Air, VRV, Packaged Air, HRV, Applied Product
Malfunction:
Address duplication, improper setting
Possible Cause:
• Address duplication of central remote controller
Malfunction Code: 60
Products: HRV
Malfunction:
External protection device actuated
Possible Cause:
• Actuation of external protection device.
• Defect of output signal wiring.
• Defect of control PCB
Malfunction Code: 64
Products: HRV
Malfunction:
Malfunction of indoor air thermistor
Possible Cause:
• Defect of connecting connector. Defect of control PCB. Defect of thermistor for indoor air
Malfunction Code: 65
Products: HRV
Malfunction:
Malfunction of outdoor air thermistor
Possible Cause:
• Defect of connector contact.
• Defect of control PCB.
• Defect of outdoor air thermistor
Malfunction Code: 6A
Products: HRV
Malfunction:
Malfunction of damper system
Possible Cause:
• Defect of connector contact.
• Defect of damper motor.
• Defect of limit switch.
• Defect of control PCB
Malfunction Code: 70
Products: Applied Product
Malfunction:
System No. 2 Compressor overload
Possible Cause:
• Shortage of refrigerant amount.
• Defect of connector contact.
• Leakage of four way valve
Malfunction Code: 71
Products: Applied Product
Malfunction:
System No. 2 Compressor overcurrent
Possible Cause:
• Shortage of refrigerant amount.
• Short-circuit.
• Defect of compressor
Malfunction Code: 72
Products: Applied Product
Malfunction:
System No. 2 Fan motor overcurrent
Possible Cause:
• Defect of fan motor connector contact.
• Defect of fan motor.
• Defect of PCB
Malfunction Code: 73
Products: Applied Product
Malfunction:
System No. 2 Malfunction of high pressure (HPS) actuated
Possible Cause:
• Dirty heat exchanger.
• Clogged refrigerant piping.
• Defect of HPS.
• Shortage of water volume.
• Defect of connector contact
Malfunction Code: 74
Products: Applied Product
Malfunction:
System No. 2 Malfunction of low pressure switch (LPS)
Possible Cause:
• Clogged refrigerant piping.
• Shortage of gas.
• Defect of connector contact. Defect of LPS
Malfunction Code: 75
Products: Applied Product
Malfunction:
System No. 2 Malfunction of low pressure sensor
Possible Cause:
• Defect of connector contact.
• Defect of low pressure sensor.
• Defect of PCB
Malfunction Code: 76
Products: Applied Product
Malfunction:
System No. 2 Malfunction of high pressure sensor
Possible Cause:
• Defect of connector contact.
• Defect of high pressure sensor.
• Defect of PCB
Malfunction Code: 77
Products: Applied Product
Malfunction:
System No. 1 Malfunction of fan inter lock
Possible Cause:
• Defect of relay contact.
• Broken wire
Malfunction Code: 78
Products: Applied Product
Malfunction:
System No. 2 Malfunction of fan inter lock
Possible Cause:
• Defect of centralized remote controller PCB
Malfunction Code: 7A
Products: Applied Product
Malfunction:
System No. 2 Malfunction of current sensor of compressor
Possible Cause:
• Defect of current sensor.
• Defect of compressor.
• Defect of outdoor unit PCB
Malfunction Code: 7C
Products: Applied Product
Malfunction:
System No. 2 Malfunction of pump inter lock
Possible Cause:
• Cooling water pump interlock actuated
Malfunction Code: 80
Products: Applied Product
Malfunction:
Malfunction of entering water temperature thermistor
Possible Cause:
• Defect of connector contact.
Defect of entering water temperature thermistor
Malfunction Code: 80
Products: Applied Product
Malfunction:
Malfunction of entering water temperature thermistor
Possible Cause:
• Defect of connector contact.
Defect of entering water temperature thermistor
Malfunction Code: 81
Products: Applied Product
Malfunction:
Malfunction of leaving water temperature thermistor
Possible Cause:
• Defect of connector contact.
Defect of leaving water temperature thermistor
Malfunction Code: 82
Products: Applied Product
Malfunction:
System No. 1 Malfunction of refrigerant thermistor
Possible Cause:
• Defect of connector contact.
• Defect of refrigerant thermistor
Malfunction Code: 83
Products: Applied Product
Malfunction:
System No. 2 Malfunction of refrigerant thermistor
Possible Cause:
• Defect of connector contact.
• Defect of refrigerant thermistor
Malfunction Code: 84
Products: Applied Product
Malfunction:
System No. 1 Malfunction of heat exchanger thermistor
Possible Cause:
• Defect of connector contact.
• Defect of heat exchanger thermistor
Malfunction Code: 85
Products: Applied Product
Malfunction:
System No. 2 Malfunction of heat exchanger thermistor
Possible Cause:
• Defect of connector contact.
• Defect of heat exchanger thermistor
Malfunction Code: 86
Products: Applied Product
Malfunction:
System No. 2 Malfunction of discharge pipe thermistor
Possible Cause:
• Defect of connecting connector.
• Defect of discharge pipe thermistor
Malfunction Code: 88
Products: Applied Product
Malfunction:
System No. 2 Malfunction of discharge pipe temperature
Possible Cause:
• Shortage of gas.
• Defect of discharge pipe thermistor.
• Defect of connector contact.
• Clogged refrigerant piping
Malfunction Code: 89
Products: Applied Product
Malfunction:
Malfunction of brazed-plate heat exchanger freezing
Possible Cause:
• Dirty heat exchanger.
• Defect of thermistor.
• Shortage of refrigerant amount
Malfunction Code: 8A
Products: Applied Product
Malfunction:
System No. 2 Malfunction of leaving water temperature thermistor
Possible Cause:
• Defect of connector contact.
• Defect of leaving water temperature thermistor
Malfunction Code: 8E
Products: Applied Product
Malfunction:
System No. 1 Malfunction of suction pipe thermistor 1 for heating
Possible Cause:
• Defect of connector contact.
• Defect of suction pipe thermistor
Malfunction Code: 8F
Products: Applied Product
Malfunction:
System No. 1 Malfunction of suction pipe thermistor 2 for heating
Possible Cause:
• Defect of connector contact. Defect of suction pipe thermistor
Malfunction Code: 8H
Products: Applied Product
Malfunction:
Abnormal high hot water temperature
Possible Cause:
• Three-way valve malfunction.
• Defect of water temperature setting.
• Defect of thermistor
Malfunction Code: 90
Products: Applied Product
Malfunction:
Abnormal chilled water quantity, abnormal AXP
Possible Cause:
• Shortage of water volume.
• Disconnection of AXP
Malfunction Code: 91
Products: Applied Product
Malfunction:
System No. 2 Malfunction of electronic expansion valve
Possible Cause:
• Defect of connector contact. Defect of electronic expansion valve coil
Malfunction Code: 92
Products: Applied Product
Malfunction:
System No. 2 Malfunction of suction pipe thermistor
Possible Cause:
• Defect of connector contact.
• Defect of suction pipe thermistor
Malfunction Code: 94
Products: HRV
Malfunction:
Malfunction of transmission (between heat reclaim ventilation unit and fan unit)
Possible Cause:
• Defect of fan unit PCB.
• Defect of connecting wire between (1) and (2)
Malfunction Code: 95
Products: Applied Product
Malfunction:
System No. 1 Malfunction of inverter system
Possible Cause:
• Defect of fan inverter unit
Malfunction Code: 96
Products: Applied Product
Malfunction:
System No. 2 Malfunction of inverter system
Possible Cause:
• Defect of fan inverter unit
Malfunction Code: 97
Products: Applied Product
Malfunction:
Malfunction of thermal storage unit
Possible Cause:
• Defect of thermal storage unit
Malfunction Code: 98
Products: Applied Product
Malfunction:
Malfunction of thermal storage brine pump
Possible Cause:
• Actuation of thermal storage brine pump overcurrent (OC)
Malfunction Code: 99
Products: Applied Product
Malfunction:
Malfunction of thermal storage brine tank
Possible Cause:
• Low water level of thermal storage brine tank
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