SERVICES

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.

Select 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: AF

Products: Sky Air, VRV
Malfunction:

Malfunction of a humidifier system

Possible Cause:

• Water leakage of humidifier (option).
• Failure of swing float switch.
• Improper drain piping incline

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: 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: F6

Products: VRV, Packaged Air
Malfunction:

Refrigerant overcharged

Possible Cause:

• Refrigerant overcharged.
• Disconnection of heat exchanger thermistor.
• Disconnection of outdoor air thermistor.
• Disconnection of liquid pipe thermistor

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:

• Shortage of power supply capacity.
• Defect of inverter PCB.
• Defect of power transistor

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: 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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