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Below is the possible reason for this error

CodeE3
ReasonActuation of high pressure switch (HPS)
Possible CauseDirty outdoor unit heat exchange
Defective high pressure switch
Clogged refrigerant piping
Defective connector contact
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package
Code82
ReasonSystem No. 1
Malfunction of refrigerant thermistor
Possible CauseDefective connector contact
Defective refrigerant thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code83
ReasonSystem No. 2
Malfunction of refrigerant thermistor
Possible CauseDefective connector contact
Defective refrigerant thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code84
ReasonSystem No. 1
Malfunction of heat exchanger thermistor
Possible CauseDefective connector contact
Defective heat exchanger thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code85
ReasonSystem No. 2
Malfunction of heat exchanger thermistor
Possible CauseDefective connector contact
Defective heat exchanger thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code86
ReasonSystem No. 1
Malfunction of discharge pipe thermistor
Possible CauseDefective connecting connector
Defective discharge pipe thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code88
ReasonSystem No. 2
Malfunction of discharge pipe temperature
Possible CauseShortage of gas
Defective discharge pipe thermistor
Defective connector contact
Clogged refrigerant piping
Type of UnitOthers
ModelsHeat reclaim ventilator
Code89
ReasonMalfunction of brazed-plate heat exchanger freezing
Possible CauseDirty heat exchanger
Shortage of refrigerant amount
Defective thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code8A
ReasonSystem No. 2
Malfunction of leaving water temperature thermistor
Possible CauseDefective connector contact
Defective leaving water temperature thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code8E
ReasonSystem No. 1
Malfunction of suction pipe thermistor 1 for heating
Possible CauseDefective connector contact
Defective suction pipe thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code8F
ReasonSystem No. 1
Malfunction of suction pipe thermistor 2 for heating
Possible CauseDefective connector contact
Defective suction pipe thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code8H
ReasonAbnormal hot water high temperature
Possible CauseThree way valve malfunction
Defective thermistor
Defect of water temperature setting
Type of UnitOthers
ModelsHeat reclaim ventilator
Code90
ReasonAbnormal chilled water quantity or abnormal AXP
Possible CauseShortage of water volume
Disconnection of AXP
Type of UnitOthers
ModelsHeat reclaim ventilator
Code91
ReasonSystem No. 2
Malfunction of electronic expansion valve
Possible CauseDefective connector contact
Defective electronic expansion valve coil
Type of UnitOthers
ModelsHeat reclaim ventilator
Code92
ReasonSystem No. 2
Malfunction of suction pipe thermistor
Possible CauseDefective connector contact
Defective suction pipe thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code94
ReasonMalfunction of transmission (between heat reclaim ventilator and fan unit)
Possible CauseDefective fan unit PCB
Defective connecting wire between (1) and (2)
Type of UnitOthers
ModelsRA
Code95
ReasonSystem No. 1
Malfunction of inverter system
Possible CauseDefective fan inverter unit
Type of UnitOthers
ModelsHeat reclaim ventilator
Code96
ReasonSystem No. 2
Malfunction of inverter system
Possible CauseDefective fan inverter unit
Type of UnitOthers
ModelsHeat reclaim ventilator
Code97
ReasonMalfunction of thermal storage unit
Possible CauseDefective thermal storage unit
Type of UnitOthers
ModelsHeat reclaim ventilator
Code98
ReasonMalfunction of thermal storage brine pump
Possible CauseActuation of thermal storage brine pump overcurrent (OC)
Type of UnitOthers
ModelsHeat reclaim ventilator
Code99
ReasonMalfunction of thermal storage brine tank
Possible CauseLow water level of thermal storage brine tank
Type of UnitOthers
ModelsHeat reclaim ventilator
CodeU0
ReasonShortage of refrigeran
Possible CauseRefrigerant shortage and refrigerant clogging (wrong piping)
Defective thermistor
Defective low pressure sensor
Defective outdoor unit main PCB
Type of UnitSystem
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeU1
ReasonReverse phase, open phase
Possible CausePower supply reverse phase
T phase open phase
Defective outdoor unit PCB (A1P)
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeU2
ReasonMalfunction of power supply or instantaneous power failure
Possible CauseAbnormal power supply voltage
Instantaneous power failure
Defective main circuit wiring
Type of UnitSystem
ModelsSkyAir, VRV, Package, Heat reclaim ventilator, Chiller
CodeU3
ReasonCheck operation not executed or transmission error
Possible CauseCheck operation is not executed.
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeU4
ReasonMalfunction of transmission between indoor and outdoor unit
Possible CauseShort circuit in indoor-outdoor or outdoor-outdoor transmission wiring (F1 / F2), or wrong wiring
Outdoor unit power supply is OFF
System address does not match
Defective indoor unit PCB
Defective outdoor unit PCB
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeU5
ReasonMalfunction of transmission between indoor unit and remote controller
Possible CauseTransmission error between indoor unit and remote controller
Connection of 2 main remote controllers (when using 2 remote controllers)
Defective indoor unit PCB
Defective remote controller PCB
Transmission error caused by noise
Type of UnitSystem
ModelsHeat reclaim ventilator, Chiller, SkyAir, VRV, Package
CodeU6
ReasonMalfunction of transmission between indoor units
Possible CauseFaulty wiring
External factor (Noise etc.)
Defective indoor unit PCB
Type of UnitSystem
ModelsVRV, Package, Heat reclaim ventilator, Chiller
CodeU7
ReasonMalfunction of transmission between outdoor units or outdoor storage unit
Possible CauseConnection error of transmission wirings between outdoor unit and external control adaptor for outdoor unit
Connection error of transmission wirings between outdoor units
Defective outdoor unit PCB
Type of UnitSystem
ModelsPackage, Heat reclaim ventilator, Chiller, VRV
CodeU8
ReasonMalfunction of transmission between remote controllers
Possible CauseTransmission error between main and sub remote controller
Connection between sub remote controllers
Defective remote controller PCB
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeU9
ReasonMalfunction of transmission (other system)
Possible CauseTransmission error between other indoor and outdoor units Defective electronic expansion valve of other indoor unit
Defective indoor unit PCB of other indoor unit
Improper connection of transmission wiring between indoor and outdoor unit
Type of UnitSystem
ModelsSkyAir, VRV, Package, Heat reclaim ventilator, Chiller
CodeUA
ReasonRemote temperature setting wire disconnection
Defect of indoor/outdoor power supply
Improper combination of indoor and outdoor units
Possible CauseWrong model connections
Improper power supply
Wrong PCB connected Defective PCB
Excess of connected indoor units
Defective outdoor unit PCB
Mismatch of the refrigerant type of indoor and outdoor unit Setting of outdoor unit PCB was not carried out after replacing to spare PCB
Remote temperature setting wire disconnection Defective connector contact
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator
CodeUC
ReasonMalfunction of setting of centralized control equipment address
Possible CauseAddress duplication of centralized control equipment Defective indoor unit PCB
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeUE
ReasonMalfunction of transmission between indoor unit and centralized control equipment
Possible CauseTransmission error between optional controllers for centralized control equipment and indoor unit
Connector for setting main controller is disconnected.(or disconnection of connector for independent / combined use changeover switch.)
Defective PCB for central remote controller
Defective indoor unit PCB
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeUF
ReasonSystem is not set yet
Possible CauseImproper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units
Failure to execute check operation
Defective indoor unit PCB
Stop valve is not opened
Type of UnitSystem
ModelsSkyAir, VRV, Package, RA
CodeUH
ReasonMalfunction of system
Possible CauseImproper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units
Defective indoor unit PCB
Defective outdoor unit PCB
Type of UnitSystem
ModelsVRV, Package
CodeUJ
ReasonMalfunction of transmission (accessory device)
Possible CauseDefect of accessory devices
Faulty wiring
Type of UnitSystem
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
Code60
ReasonExternal protection device activated (Heat reclaim ventilator)
Possible CauseActuation of external protection device
Defective output signal wiring
Defective control PCB
Type of UnitOthers
ModelsRA
Code64
ReasonMalfunction of indoor air thermistor (Heat reclaim ventilator)
Possible CauseDefective connector contact
Defective indoor air thermistor
Defective control PCB
Type of UnitOthers
ModelsRA
Code65
ReasonMalfunction of outdoor air thermistor (Heat reclaim ventilator)
Possible CauseDefective connector contact
Defective outdoor air thermistor
Defective control PCB
Type of UnitOthers
ModelsRA
Code6A
ReasonMalfunction of damper system
(Heat reclaim ventilator)
Possible CauseDefective connector contact
Defective limit switch
Defective damper motor
Defective control PCB
Type of UnitOthers
ModelsRA
Code70
ReasonSystem No. 2
Compressor overheat
Possible CauseShortage of refrigerant amount
Defective connector contact
Leakage of four way valve
Type of UnitOthers
ModelsHeat reclaim ventilator
Code71
ReasonSystem No. 2
Compressor overcurrent
Possible CauseShortage of refrigerant amount
Short circuit
Defective compressor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code72
ReasonSystem No. 2
Fan motor overcurrent
Possible CauseDefective fan motor connector contact
Defective fan motor
Defective PCB
Type of UnitOthers
ModelsHeat reclaim ventilator
Code73
ReasonSystem No. 2
Actuation of high pressure switch
(HPS)
Possible CauseDirty heat exchanger
Shortage of water volume
Clogged refrigerant piping
Defective connector contact
Defective HPS
Type of UnitOthers
ModelsHeat reclaim ventilator
Code74
ReasonSystem No. 2
Actuation of low pressure switch
(LPS)
Possible CauseClogged refrigerant piping
Defective connector contact
Shortage of gas
Defective LPS
Type of UnitOthers
ModelsHeat reclaim ventilator
Code75
ReasonSystem No. 2
Malfunction of low pressure sensor
Possible CauseDefective connector contact
Defective low pressure sensor
Defective PCB
Type of UnitOthers
ModelsHeat reclaim ventilator
Code76
ReasonSystem No. 2
Malfunction of high pressure sensor
Possible CauseDefective connector contact
Defective high pressure sensor
Defective PCB
Type of UnitOthers
ModelsHeat reclaim ventilator
Code77
ReasonSystem No. 1
Malfunction of fan inter lock
Possible CauseDefective relay contact
Broken wire
Type of UnitOthers
ModelsHeat reclaim ventilator
Code78
ReasonSystem No. 2
Malfunction of fan inter lock
Possible CauseDefective relay contact
Broken wire
Type of UnitOthers
ModelsHeat reclaim ventilator
Code7A
ReasonSystem No. 2
Malfunction of compressor current sensor
Possible CauseDefective current sensor
Defective compressor
Defective outdoor unit PCB
Type of UnitOthers
ModelsHeat reclaim ventilator
Code7C
ReasonSystem No. 2
Malfunction of pump inter lock
Possible CauseCooling water pump interlock actuated
Type of UnitOthers
ModelsHeat reclaim ventilator
Code80
ReasonMalfunction of entering water temperature thermistor
Possible CauseDefective connector contact
Defective entering water temperature thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
Code81
ReasonMalfunction of leaving water temperature thermistor or drain pipe heater
Possible CauseDefective connector contact
Defective leaving water temperature thermistor
Type of UnitOthers
ModelsHeat reclaim ventilator
CodeL0
ReasonMalfunction of inverter system
Possible CauseShortage of power supply capacity
Defective power transistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsVRV, Heat reclaim ventilator
CodeL1
ReasonMalfunction of inverter PCB
Possible CauseDefective compressor wiring
Defective outdoor unit fan motor
Blown fuse
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeL3
ReasonEl.compo. box temperature rise
Possible CauseFin temperature rise due to short circuit
Defective outdoor unit fan motor
Defective power transistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator, SkyAir, VRV
CodeL4
ReasonMalfunction of inverter radiation fin temperature rise
Possible CauseFin temperature rise due to short circuit
Defective fin thermistor
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeL5
Reasonnverter instantaneous overcurrent (DC output)
Possible CauseDefective compressor coil (such as wiring disconnection or insulation failure)
Compressor startup failure (mechanical lock)
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeL6
ReasonInverter instantaneous overcurrent (AC output)
Possible CauseOvercharge of refrigerant amount
Shortage of power supply capacity
Defective compressor
Defective inverter unit
Type of UnitOutdoor Unit
ModelsVRV, Heat reclaim ventilator
CodeL8
ReasonMalfunction of inverter compressor startup error (Stall prevention)
Possible CauseCompressor overloaded
Wiring disconnection in compressor coil
Disconnection of compressor wiring
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeL9
ReasonMalfunction of inverter compressor startup error (Stall prevention)
Possible CauseThe stop valve is not opened
Defective compressor
Error in wire connections to compressor
Large differential pressure before compressor startup
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeLA
ReasonMalfunction of power transistor
Possible CauseDefective power transistor
Defective compressor
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsVRV, Heat reclaim ventilator
CodeLC
ReasonMalfunction of transmission between control and inverter PCB
Possible CauseDefective connection between the inverter PCB and the control PCB
External factors (e.g. noise)
Defective inverter compressor
Defective control PCB (transmission block)
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeM1
ReasonMalfunction of central remote controller PCB
Possible CauseDefective central remote controller PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Chiller
CodeM8
ReasonImproper combination of optional controllers for centralized control
Possible CauseOther centralized control power disconnection
Centralized control reset switch ON
Defective transmission wiring
Central remote controller address change
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Chiller
CodeMA
ReasonImproper combination of optional controllers for centralized control
Possible CauseImproper combination of optional controllers for centralized control
More than one master controller is connected
Faulty setting of centralized control
Defect of centralized control
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Chiller
CodeMC
ReasonAddress duplication, improper setting
Possible CauseAddress duplication of central remote controller
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Chiller
CodeP0
ReasonShortage of refrigerant amount (thermal storage unit)
Possible CauseShortage of refrigerant
Clogged refrigerant piping
Type of UnitOutdoor Unit
ModelsVRV, Heat reclaim ventilator
CodeP1
ReasonPower voltage imbalance or inverter PCB
Possible CauseOpen phase
Interphase voltage imbalance
Defective capacitor in the main circuit
Defective wiring in the main circuit
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeP2
ReasonAutomatic refrigerant charge operation stop
Possible CauseThe stop valve is not opened
Closed valve of refrigerant tank
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeP3
ReasonMalfunction of thermistor in switch box
Possible CauseDefective connection of thermistor
Defective reactor thermistor
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeP4
ReasonMalfunction of radiation fin temperature sensor
Possible CauseDefective radiation fin temperature thermistor
Defective inverter PCB
Defective INV. compressor
Defective fan motor
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeP8
ReasonHeat exchanger freezing protection during automatic refrigerant charging
Possible Cause(Close the refrigerant cylinder. Start again from step 1.)
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package
CodeP9
ReasonMalfunction of fan motor (humidifier unit)
Possible CauseDefective fan motor
Defective outdoor unit PCB
Broken relay harness
Defective connector contact
Type of UnitOutdoor Unit
Models
CodePA
ReasonBroken wire of heater (humidifier unit)
Refrigerant cylinder during automatic refrigerant charging
Possible CauseRefrigerant cylinder of master unit is empty
Defective heater unit
Defective thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir
CodePC
ReasonRefrigerant cylinder during automatic refrigerant charging
Possible CauseRefrigerant cylinder of slave unit 2 is empty
Type of UnitOutdoor Unit
ModelsVRV, Package
CodePE
ReasonAutomatic refrigerant charge operation nearly completed
Possible Cause
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package
CodePH
ReasonRefrigerant cylinder during automatic refrigerant charging
Possible CauseDefective heater unit
Defective connector contact
Defective thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsVRV, Package
CodePJ
ReasonMalfunction of capacity setting (Outdoor unit PCB)
Improper combination between inverter and fan driver
Possible CauseCapacity setting adaptor is not installed
Improper capacity setting adaptor
Defective outdoor unit PCB
Mis-matching of type of PCB
Improper (or no) field setting after replacing outdoor unit main PCB
Type of UnitSystem
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeE5
ReasonInverter compressor motor or overheat
Possible CauseInverter compressor lock
High differential pressure
Defective inverter PCB
UVW connection error
Defective connector contact
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeE6
ReasonSTD compressor motor overcurrent/lock
System No.1
Compressor overcurrent
Possible CauseDefective compressor
Defective control PCB
The stop valve is not opened
Defective electronic expansion valve
Shortage of refrigerant amount
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeE7
ReasonMalfunction of outdoor unit fan motor system
Possible CauseFan motor failure
Neglect to connect or defective connection of harness/ connector between the fan motor and the PCB
Fan does not rotate due to foreign matters caught in it
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeE8
ReasonOvercurrent of inverter compressor
Possible CauseDefective compressor
Defective inverter main circuit capacitor
Defect of outdoor unit PCB
Defect of power transistor
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator
CodeE9
ReasonMalfunction of electronic expansion valve coil
Possible CauseDisconnection of connectors from electronic expansion valves
Defective electronic expansion valve coil
Defective outdoor unit control PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeEA
ReasonMalfunction of four way valve or cool/heat switchin
Possible CauseDefective four way valve
Shortage of gas
Defective outdoor unit PCB
Defective thermistor
Type of UnitOutdoor Unit
Models
CodeEC
ReasonMalfunction of entering water temperature
Possible CauseCooling water temperature abnormality
Defective outdoor unit PCB
Defective thermistor
Type of UnitOutdoor Unit
ModelsVRV
CodeF3
ReasonMalfunction of discharge pipe temperature
Possible CauseDefective discharge pipe thermistor
Abnormal discharge pipe temperature
Defective outdoor unit control PCB
Defective connector contact
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeF6
ReasonAbnormal high pressure or refrigerant overcharged
Possible CauseRefrigerant overcharged
Disconnection of heat exchanger deicer thermistor
Disconnection of outdoor air thermistor
Disconnection of liquid pipe temperature thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsPackage, SkyAir, VRV
CodeH0
ReasonMalfunction of sensor system of compressor
Possible CauseHarness is disconnected, or defective connection
Defective PCB
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator
CodeH1
ReasonMalfunction of room temperature sensor or humidifier unit damper
Possible CauseDefective limit switch
Defective damper
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator
CodeH3
ReasonMalfunction of high pressure switch (HPS)
Possible CauseDefective high pressure switch
Broken wire
Defective outdoor unit PCB
Defective connector contact
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeH4
ReasonMalfunction of low pressure switch (LPS)
Possible CauseDefective low pressure switch
Broken wire
Defective outdoor unit PCB
Defective connector contact
Type of UnitOutdoor Unit
ModelsVRV, Heat reclaim ventilator, SkyAir
CodeH5
ReasonMalfunction of compressor motor overload thermistor
Possible CauseDefect of compressor motor overload thermistor
Defective connector contact
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator
CodeH6
ReasonMalfunction of position detection sensor
Possible CauseFaulty contact of compress or cable
Defective compressor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsPackage, Heat reclaim ventilator
CodeH7
ReasonMalfunction of outdoor unit fan motor signal
Possible CauseAbnormal signal from fan motor (Circuit failure)
Disconnection/Short circuit in fan motor leads or disconnection of connector
Defective inverter PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeH8
ReasonMalfunction of compressor input (CT) system
Possible CauseDefective power transistor
Defective reactor
Faulty wiring of inverter system
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator
CodeH9
ReasonMalfunction of outdoor air thermistor
Possible CauseDefective connection of thermistor
Defective outdoor unit PCB
Defective outdoor air thermistor
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeHC
ReasonMalfunction of (hot) water temperature thermistor
Possible CauseDefective connection of thermistor
Defective outdoor unit PCB
Defective water temperature thermistor
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Heat reclaim ventilator
CodeHF
ReasonAlarm in thermal storage unit or storage controller
Possible CauseThermal storage group defective wiring
Defective setting
Excess of thermal storage tank numbers
Type of UnitOutdoor Unit
ModelsVRV
CodeHJ
ReasonMalfunction of thermal storage tank water level
Possible CauseLow water level
Defective switch setting
Water level detecting sensor failure
Defective connector contact
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package
CodeJ1
ReasonMalfunction of pressure sensor
Possible CauseDefective pressure sensor connector contact
Defective pressure sensor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJ2
ReasonMalfunction of current sensor of compressor
Possible CauseDefective current sensor
Defective compressor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJ3
ReasonMalfunction of discharge pipe thermistor
Possible CauseDefective connection of thermistor
Defective discharge pipe thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJ4
ReasonMalfunction of low pressure equivalent saturated temperature sensor system
Possible CauseDefective connection of thermistor
Defective thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsVRV, Heat reclaim ventilator
CodeJ5
ReasonMalfunction of suction pipe thermistor
Possible CauseDefective connection of thermistor
Defective suction pipe thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJ6
ReasonMalfunction of heat exchanger thermistor
Possible CauseDefective connection of thermistor
Defective heat exchanger thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJ7
ReasonMalfunction of thermistor (Refrigerant circuit)
Possible CauseDefective connection of thermistor
Defective liquid pipe thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator, SkyAir, VRV, Package
CodeJ8
ReasonMalfunction of thermistor (Refrigerant circuit)
Possible CauseDefective connection of thermistor
Defective liquid pipe thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJ9
ReasonMalfunction of thermistor (Refrigerant circuit)
Possible CauseDefective connection of thermistor
Defective gas pipe thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJA
ReasonMalfunction of low pressure sensor
Possible CauseDefective connector contact
Connection of low pressure sensor in mistake for high pressure sensor
Defective high pressure sensor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsPackage, Heat reclaim ventilator, SkyAir, VRV
CodeJC
ReasonMalfunction of low pressure sensor
Possible CauseDefective connector contact
Connection of high pressure sensor in mistake for low pressure sensor
Defective low pressure sensor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeJE
ReasonMalfunction of oil pressure sensor or sub-tank thermistor
Possible CauseDefective connector contact
Defective sub-tank thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsVRV
CodeJF
ReasonMalfunction of oil level sensor or heating heat exchanger thermistor
Possible CauseDefective connector contact
Defective heat exchanger thermistor
Defective outdoor unit PCB
Type of UnitOutdoor Unit
ModelsVRV
CodeA7
ReasonMalfunction of swing flap motor
Possible CauseDefective swing flap motor
Defective indoor unit PCB
Defective connection cable
Defective airflow direction adjusting flap-cam
Type of UnitIndoor Unit
ModelsSkyAir, VRV
CodeAA
ReasonHeater overheat
Possible Cause26WH is activated
Type of UnitIndoor Unit
ModelsPackage, Heat reclaim ventilator
CodeAF
ReasonMalfunction of a humidifier system
Possible CauseHumidifier unit (optional accessory) leaking
Defective drain piping (upward slope, etc.)
Defective indoor unit PCB
Type of UnitIndoor Unit
ModelsSkyAir, VRV, RA
CodeC4
ReasonMalfunction of liquid pipe thermistor for heat exchanger
Possible CauseDefective thermistor for liquid pipe
Defective indoor unit PCB
Defective connector contact
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator, Chiller
CodeC5
ReasonMalfunction of gas pipe thermistor for heat exchanger
Possible CauseDefective thermistor for gas pipe
Defective indoor unit PCB
Defective connector contact
Type of UnitIndoor Unit
ModelsVRV, Package, RA, Heat reclaim ventilator
CodeC6
ReasonMalfunction of fan motor sensor or fan control driver
Possible CauseDefective fan PCB
Defective connection of capacity setting adaptor
Field setting error
Type of UnitIndoor Unit
ModelsSkyAir, VRV
CodeC7
ReasonFront panel driving motor fault
Possible CauseDefective front panel driving motor
Defective limit switch
Type of UnitIndoor Unit
Models
CodeC9
ReasonMalfunction of suction air thermistor
Possible CauseDefective thermistor for suction air
Defective indoor unit PCB
Defective connector contact
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package, RA, Chiller
CodeCA
ReasonMalfunction of discharge air thermistor
Possible CauseDefective thermistor for discharge air
Defective indoor unit PCB
Defective connector contact
Type of UnitIndoor Unit
ModelsVRV, Package, RA
CodeCC
ReasonMalfunction of humidity sensor system
Possible CauseDefective humidity sensor
Defective connector contact
Type of UnitIndoor Unit
ModelsSkyAir, Package
CodeCJ
ReasonRoom temperature thermistor in remote controller abnormality
Possible CauseDefective room temperature thermistor in remote controller
Defective remote controller PCB
External factor (Noise etc.)
Type of UnitIndoor Unit
ModelsVRV, Package, Chiller, SkyAir
CodeE0
ReasonProtection devices activated (unified)
Possible CauseProtection device connected to outdoor unit PCB actuated
Defective protection device connector contact
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator, SkyAir, VRV
CodeE1
ReasonDefective outdoor unit PCB
Possible CauseDefective outdoor unit PCB
Defective connection of inside/ outside relay wires
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeE3
ReasonSystem No.1
Actuation of high pressure switch (HPS)
Possible CauseDirty outdoor unit heat exchanger
Shortage of water volume
Clogged refrigerant piping
Defective connector contact
Defective HPS
Type of UnitOutdoor Unit
ModelsHeat reclaim ventilator
CodeE4
ReasonActuation of low pressure switch (LPS)
Possible CauseAbnormally drop in low pressure
Defective low pressure sensor
Defective outdoor unit PCB
Defective connector contact
Type of UnitOutdoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator
CodeA0
ReasonExternal protection device activated
Possible CauseExternal protection device connected to the terminal strip
T1-T2 of indoor unit is activated
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package
CodeA1
ReasonMalfunction of indoor unit PCB
Possible CauseDefective indoor unit PCB
External factor (Noise etc.)
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator
CodeA3
ReasonDrain Level Control System Abnormality
Possible CauseDrain clogging, upward slope, etc.
Defective drain pump
Defective float switch or short circuit connector
Type of UnitIndoor Unit
ModelsRA, Chiller, SkyAir, VRV
CodeA4
ReasonMalfunction of freezing protection
Possible CauseShortage of water volume
Low water temperature setting
Defective water temperature thermistor
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package, Heat reclaim ventilator, Chiller
CodeA5
ReasonHigh pressure control in heating, freeze-up protection control in cooling
Possible CauseClogged air filter of indoor unit and short circuit
Defect of indoor unit heat exchanger thermistor
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package
CodeA6
ReasonMalfunction of fan motor
Possible CauseBroken wires in, short circuit of, or disconnection of connectors from the fan motor harness
Defective fan motor
Defective indoor unit PCB
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package, RA
CodeA8
ReasonMalfunction of power supply or AC input overcurrent
Possible CauseDefective power supply voltage
Defective connection on signal line
Defective wiring
Type of UnitIndoor Unit
ModelsSkyAir, VRV, RA
CodeA9
ReasonMalfunction of electronic expansion valve
Possible CauseDefective electronic expansion valve coil
Defective indoor unit PCB
Defective relay cables
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package, RA, Heat reclaim ventilator
CodeAH
ReasonMalfunction of dust collector of air cleaner
Possible CauseDefect of dust collecting element
Stained insulator part
Defect of high voltage power supply unit
Defect of indoor unit PCB
Type of UnitIndoor Unit
ModelsChiller, SkyAir, VRV
CodeAJ
ReasonMalfunction of capacity setting (Indoor unit PCB)
Possible CauseThe capacity setting adaptor was not installed when replacing PCB.
Defective indoor unit PCB
Type of UnitIndoor Unit
ModelsSkyAir, VRV, Package
CodeC1
ReasonFailure of transmission (between indoor unit PCB and sub PCB)
Possible CauseDefective connection of the connector between indoor unit PCB
Type of UnitIndoor Unit
ModelsSkyAir, VRV

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