Daikin Air Conditioner Error Codes

Error Codes and Troubleshooting for Daikin Air Conditioners

The list below features all the malfunction error codes for Daikin air conditioners and their potential causes.  You may determine the state and problem of the air conditioner or air conditioning system by looking up the error code.

Daikin air conditioner error codes
Malfunction Error CodeMalfunction ContentsPotential causesSystems
RASkyAirVRVPackageHRVChiller
Indoor UnitA0External protection device activatedExternal protection device connected to the terminal strip T1-T2 of indoor unit is activated
A1Malfunction of indoor unit PCBMalfunction due to noise Defect of indoor unit PCB
A3Malfunction of drain level control systemDrain piping clogging, improper drain piping work Defect of drain pump Defect of float switch
A4Malfunction of freezing protectionShortage of water volume Low water temperature setting Defect of 26WL Defect of water temperature thermistor
A5High pressure control in heating, freeze-up protection control in coolingClogged air filter of indoor unit and short-circuit Defect of indoor unit heat exchanger thermistor
A6Fan motor locked, overload, overcurrentDefect of connector contact Defect of indoor unit PCBDefect of fan motor
A7Malfunction of swing flap motorFailure of swing flap motor Defect of indoor unit PCB Jammed swing mechanism/blade
A8Malfunction of power supplyOvercurrent of AC inputDefect of power supply voltage
A9Malfunction of electronic expansion valve driveDefect of electronic expansion valve coilDefect of indoor unit PCB Defect of connector contact
AAHeater overheat26WH is activated
AFMalfunction of a humidifier systemWater leakage of humidifier (option)Failure of swing float switch Improper drain piping incline
AHMalfunction of dust collector of air cleanerDefect of dust collecting element Defect of high voltage power supply unitStained insulator part Defect of indoor unit PCB
AJMalfunction of capacity setting (Indoor unit PCB)Capacity setting adaptor is not installed when replacing PCB Defect of indoor unit PCB
C1Failure of transmission (between indoor unit PCB and fan PCB)Defect of transmission of fan motor control driver
C4Malfunction of liquid pipe thermistor for heat exchangerDefect of connector contactDefect of liquid pipe thermistor for heat exchanger
C5Malfunction of gas pipe thermistor for heat exchangerDefect of connector contactDefect of gas pipe thermistor for heat exchanger
C6Malfunction of fan motor control driverDefect of fan motor sensor system Defect of fan motor control driver
C7Front panel driving motor faultDefect of front panel driving motor Defect of limit switch
C9Malfunction of suction air thermistorDefect of connector contact Defect of thermistor for suction air
CAMalfunction of discharge air thermistorDefect of connector contactDefect of thermistor for discharge air
CCMalfunction of humidity sensor systemDefect of connector contact Defect of humidity sensor
CJMalfunction of thermostat sensor in remote controllerDefect of remote controller thermistor Malfunction due to noise Defect of remote controller PCB
Outdoor UnitE0Protection devices actuated (unified)Protection device connected to outdoor PCB actuated Defect of protection device connector contact
E1Defect of outdoor unit PCBMalfunction due to noise Defect of outdoor unit PCB
E3Actuation of high pressure switch (HPS)Dirty outdoor unit heat exchanger and suction filter Defect of HPS Clogged refrigerant piping Defect of connector contact
E3System No.1Actuation of high pressure switch (HPS)Dirty outdoor unit heat exchanger Clogged refrigerant piping Defect of HPSShortage of water volume Defect of connector contact
Outdoor UnitE4Actuation of low pressure switch (LPS)Clogged refrigerant piping Shortage of gasDefect of connecting connector Defect of outdoor unit PCB
E5Overheat of inverter compressor motorShortage of refrigerant amount Defect of connector contact Leakage of four way valve
E5Inverter compressor motor lockInverter compressor lock Incorrect wiring
E6STD compressor motor overcurrent/lockClosed stop valve STD compressor lock
E6System No.1 Compressor overcurrentDefect of EXP. valve Defect of compressorShortage of refrigerant amount
E7Malfunction of outdoor unit fan motorFaulty contact of fan motor connectorDefect of fan motor Defect of fan motor driver
E8Overcurrent of inverter compressorDefect of compressor Defect of outdoor unit PCB Defect of inverter main circuit capacitor Defect of power transistor
E9Malfunction of electronic expansion valve coilDefect of electronic expansion valve Defect of connector contact Defect of outdoor unit PCB
EAMalfunction of four way valveDefect of four way valve Defect of outdoor unit PCBShortage of gas Defect of thermistor
ECMalfunction of entering water temperatureMalfunction of cooling water temperatureDefect of thermistor Defect of outdoor unit PCB
EFMalfunction of thermal storage unitDefect of electronic expansion valve of thermal storage unit Defect of thermal storage PCB
F3Malfunction of discharge pipe temperatureShortage of gasDefect of connector contactClogged refrigerant piping Defect fo discharge pipe thermistor
F6Abnormal high pressure in coolingDefect of outdoor unit fan motor Defect of electronic expansion valve Defect of heat exchanger thermistor Defect of outdoor unit PCB
F6Refrigerant overchargedRefrigerant overcharged Disconnection of heat exchanger thermistorDisconnection of outdoor air thermistor Disconnection of liquid pipe thermistor
H0Malfunction of sensor system of compressorHarness is disconnected, or defective connection Defect of PCB
H1Malfunction of humidifier unit damperDefect of limit switch Defect of damper
H3Malfunction of high pressure switch (HPS)Defect of high pressure switch Broken wireDefect of connector contact Defect of outdoor unit PCB
H4Malfunction of low pressure switch (LPS)Defect of low pressure switch Broken wireDefect of connector contact Defect of outdoor unit PCB
H5Malfunction of compressor motor overload thermistorDefect of connector contactDefect of compressor motor overload thermistor
H6Malfunction of position detection sensorFaulty contact of compress or cableDefect of compressor Defect of outdoor unit PCB
H7Malfunction of outdoor fan motor signalFaulty contact of fan wiring Defect of fan motor driverDefect of fan motor
H8Malfunction of compressor input (CT) systemDefect of power transistor Defect of reactorFaulty wiring of inverter system Defect of outdoor unit PCB
H9Malfunction of outdoor air thermistorDefect of connector contact Defect of thermistor for outdoor air
HCMalfunction of (hot) water temperature thermistorDefect of connector contact Defect of outdoor unit PCB Defect of thermistor for water temperature
HFAlarm in thermal storage unit with iceThermal storage group defective wiring Defect of setting Excess of thermal storage tank numbers
HJMalfunction of thermal storage tank water levelLow water level Defect of switch setting Water level detecting sensor failure Defect of connector contact
Outdoor UnitJ1Malfunction of pressure sensorDefect of pressure sensor connector contactDefect of pressure sensor Defect of outdoor unit PCB
J2Malfunction of current sensor of compressorDefect of current sensor Defect of outdoor unit PCBDefect of compressor
J3Malfunction of discharge pipe thermistorDefect of connector contact Defect of outdoor unit PCBDefect of discharge pipe thermistor
J4Malfunction of low pressure equivalent saturated temperature sensor systemDefect of connector contact Defect of thermistor Defect of outdoor unit PCB (Multi-split, Super-multi )
J5Malfunction of suction pipe thermistorDefect of connector contact Defect of outdoor unit PCBDefect of suction pipe thermistor
J6Malfunction of heat exchanger thermistorDefect of connector contact Defect of outdoor unit PCBDefect of heat exchanger thermistor
J7Malfunction of liquid pipe thermistor (Refrigerant circuit and others)Defect of connector contact Defect of outdoor unit PCBDefect of liquid pipe thermistor
J8Malfunction of liquid pipe thermistor (Refrigerant circuit and others)Defect of connector contact Defect of outdoor unit PCBDefect of liquid pipe thermistor
J9Malfunction of gas pipe thermistor (Refrigerant circuit and others)Defect of connector contact Defect of outdoor unit PCBDefect of gas pipe thermistor
JAMalfunction of high pressure sensorDefect of connector contact Defect of outdoor unit PCBDefect of high pressure sensor
JCMalfunction of low pressure sensorDefect of connector contact Defect of outdoor unit PCBDefect of low pressure sensor
JEMalfunction of sub-tank thermistorDefect of connector contact Defect of outdoor unit PCBDefect of sub-tank thermistor
JFMalfunction of heating thermistor for heat exchangerDefect of connector contact Defect of outdoor unit PCBDefect of heat exchanger thermistor
JHMalfunction of oil temperature thermistorDefect of connector contact Defect of outdoor unit PCBDefect of oil temperature thermistor
L0Malfunction of inverter systemShortage of power supply capacity Defect of inverter PCBDefect of power transistor
L1Malfunction of inverter PCBDefect of compressor wiring Blown fuseDefect of outdoor unit fan motor Defect of inverter PCB
L3Electrical box temperature riseFin temperature rise due to short-circuit Defect of power transistorDefect of outdoor unit fan Defect of outdoor unit PCB
L4Malfunction of inverter radiating fin temperature riseFin temperature rise due to short-circuit Defect of fin thermistor
L5Inverter instantaneous overcurrent (DC)Closed stop valve Defect of compressor
L6Inverter instantaneous overcurrent (AC)Overcharge of refrigerant amount Defect of compressorShortage of power supply capacity Defect of inverter unit
L8Overcurrent of inverter compressorAbnormal high pressure rise due to clogged refrigerant circuit and others Defect of compressor
L9Malfunction of inverter compressor startupFaulty of pressure equalization Defect of compressor wiringDefect of compressor
LAMalfunction of power transistorDefect of power transistor Defect of inverter PCBDefect of compressor
LCMalfunction of transmission between outdoor unit PCB and micro-computerDefect of grounding connection Defect of outdoor unit PCBMalfunction due to noise
LCMalfunction of transmission between control and inverter PCBDefect of connector contact Defect of inverter PCBMalfunction due to noise Defect of outdoor unit control PCB
P0Shortage of refrigerant amount (thermal storage unit)Shortage of refrigerant Clogged refrigerant piping
Outdoor UnitP1Power voltage imbalance, open phaseOpen phase Voltage imbalance between phases Faulty main circuit capacitor Defect of wiring contact
P2Automatic refrigerant charge operation stopClosed stop valveClosed valve of refrigerant tank
P3Malfunction of thermistor in electrical boxElectrical box temperature rise (ambient temperature rise) Defect of fin thermistor Defect of outdoor unit PCB
P4Malfunction of radiating fin temperature sensorDefect of radiating fin thermistor Defect of wiring contact Defect of outdoor unit PCB
P8Heat exchanger freezing protection during automatic refrigerant charging(Close the refrigerant cylinder. Start again from step 1.)
P9Malfunction of fan motor (humidifier unit)Defect of fan motor Broken relay harnessDefect of outdoor unit PCB Defect of connector contact
P9Automatic refrigerant charge operation completed
PABroken wire of heater (humidifier unit)Defect of heater unit Defect of outdoor unit PCBDefect of thermistor
PAEmpty refrigerant cylinder during automatic refrigerant chargingRefrigerant cylinder of master unit is empty
PCEmpty refrigerant cylinder during automatic refrigerant chargingRefrigerant cylinder of slave unit 2 is empty
PEAutomatic refrigerant charge operation nearly completed
PHMalfunction of temperature (humidifier unit)Defect of heater unit Defect of thermistorDefect of connector contact Defect of outdoor unit PCB
PHEmpty refrigerant cylinder during automatic refrigerant chargingRefrigerant cylinder of slave unit 1 is empty
PJMalfunction of capacity setting (Outdoor unit PCB)Capacity setting adaptor is not installed Improper capacity setting adaptor Defect of outdoor unit PCB
PJImproper combination between inverter and fan driverMistake of inverter PCB Mistake of control PCBMistake of inverter fan PCB
SystemU0Shortage of refrigerantShortage of refrigerant Closed stop valveClogged refrigerant piping
U1Reverse phase, open phaseReverse phase, open phase of power wiringWrong wiring Defect of outdoor unit PCB
U2Defect of power supply voltage or instantaneous power failureDefect of power supply voltage Instantaneous power failure Defect of wiring contact
U3Check operation not executedCheck operation not executed
U3Malfunction of transmissionMalfunction due to noise Defect of outdoor unit PCBWrong wiring
U4Malfunction of transmission between indoor and outdoor unitDefect or indoor-outdoor transmission wiring Malfunction due to noiseDefect of indoor unit PCB and outdoor unit PCB
U5Malfunction of transmission between indoor unit and remote controllerDefect of remote controller wiring Defect of indoor unit PCB Malfunction due to noise Defect of remote controller main/sub setting
U6Malfunction of transmission between indoor unitsFaulty wiringDefect of indoor unit PCBMalfunction due to noise
U7Malfunction of transmission between main body micro-computer – INV micro-computerHarness disconnection/broken wire between PCB Defect of outdoor unit PCB
U7Malfunction of transmission between outdoor unitsDefect of wiring between outdoor units Defect of outdoor unit switch setting Defect of wiring between outdoor – thermal storage units
U8Malfunction of transmission between remote controllersDefect of remote controller main/sub settingDefect of remote controller wiring Defect of remote controller PCB
Others77System No. 1Malfunction of fan inter lockDefect of relay contact Broken wire
78System No. 2Malfunction of fan inter lockDefect of relay contact Broken wire
7ASystem No. 2Malfunction of current sensor of compressorDefect of current sensor Defect of compressor Defect of outdoor unit PCB
7CSystem No. 2Malfunction of pump inter lockCooling water pump interlock actuated
80Malfunction of entering water temperature thermistorDefect of connector contactDefect of entering water temperature thermistor
81Malfunction of leaving water temperature thermistorDefect of connector contactDefect of leaving water temperature thermistor
82System No. 1Malfunction of refrigerant thermistorDefect of connector contact Defect of refrigerant thermistor
83System No. 2Malfunction of refrigerant thermistorDefect of connector contact Defect of refrigerant thermistor
84System No. 1Malfunction of heat exchanger thermistorDefect of connector contactDefect of heat exchanger thermistor
85System No. 2Malfunction of heat exchanger thermistorDefect of connector contactDefect of heat exchanger thermistor
86System No. 2Malfunction of discharge pipe thermistorDefect of connecting connector Defect of discharge pipe thermistor
88System No. 2Malfunction of discharge pipe temperatureShortage of gas Defect of discharge pipe thermistor Defect of connector contact Clogged refrigerant piping
89Malfunction of brazed-plate heat exchanger freezingDirty heat exchanger Shortage of refrigerant amount Defect of thermistor
8ASystem No. 2Malfunction of leaving water temperature thermistorDefect of connector contactDefect of leaving water temperature thermistor
8ESystem No. 1Malfunction of suction pipe thermistor 1 for heatingDefect of connector contact Defect of suction pipe thermistor
8FSystem No. 1Malfunction of suction pipe thermistor 2 for heatingDefect of connector contact Defect of suction pipe thermistor
8HAbnormal high hot water temperatureThree-way valve malfunction Defect of thermistor Defect of water temperature setting
90Abnormal chilled water quantity, abnormal AXPShortage of water volume Disconnection of AXP
91System No. 2Malfunction of electronic expansion valveDefect of connector contactDefect of electronic expansion valve coil
92System No. 2Malfunction of suction pipe thermistorDefect of connector contact Defect of suction pipe thermistor
94Malfunction of transmission (between heat reclaim ventilation unit and fan unit)Defect of fan unit PCBDefect of connecting wire between (1) and (2)
95System No. 1Malfunction of inverter systemDefect of fan inverter unit
96System No. 2Malfunction of inverter systemDefect of fan inverter unit
97Malfunction of thermal storage unitDefect of thermal storage unit
98Malfunction of thermal storage brine pumpActuation of thermal storage brine pump overcurrent (OC)
99Malfunction of thermal storage brine tankLow water level of thermal storage brine tank
SystemU9Malfunction of transmission (other system)Defect of communication between other indoor unit and outdoor unit Other indoor unit electronic expansion valve failure
UADefect of indoor/outdoor power supplyWrong model connections Wrong PCB connectedImproper power supply Defect of PCB
UAMalfunction of field settingMalfunction of field setting by remote controllerDefect of remote controller wiring Defective connection of optional device Defect of indoor unit PCB
UAImproper combination of indoor and outdoor unitsExcess of connected indoor units Malfunction of field setting Uncanceled service mode Defect of outdoor unit PCB
UARemote temperature setting wire disconnectionRemote temperature setting wire disconnection Defect of connector contact
UCMalfunction of setting of centralized controller addressAddress duplication of centralized controller
UEMalfunction of transmission between indoor unit and centralized controllerMalfunction of wiring between indoor unit and centralized controller Defect of setting of group number Defect of indoor unit PCB
UFWiring and piping mismatchImproper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor units
UHMalfunction of systemImproper connection of transmission wiring between indoor- outdoor units and outdoor-outdoor units Defect of indoor and outdoor unit PCB (RA: Mismatching indoor and outdoor units, Defect of voltage, Freeze protection in other indoor unit(k)
UJMalfunction of transmission (Accessory devices)Defect of accessory devices Faulty wiring
M1Malfunction of centralized remote controller PCBDefect of centralized remote controller PCB
M8Malfunction of transmission between optional controllers for centralized controlOther centralized control power disconnection Centralized control reset switch ON Defect of transmission wiring Central remote controller address change
MAImproper combination of optional controllers for centralized controlImproper combination of optional controllers for centralized control More than one master controller is connectedFaulty setting of centralized control Defect of centralized control
MCAddress duplication, improper settingAddress duplication of central remote controller
Others60External protection device actuatedActuation of external protection deviceDefect of output signal wiring Defect of control PCB
64Malfunction of indoor air thermistorDefect of connecting connector Defect of thermistor for indoor air Defect of control PCB
65Malfunction of outdoor air thermistorDefect of connector contact Defect of control PCBDefect of outdoor air thermistor
6AMalfunction of damper systemDefect of connector contact Defect of damper motorDefect of limit switch Defect of control PCB
70System No. 2 Compressor overloadShortage of refrigerant amount Defect of connector contact Leakage of four way valve
71System No. 2 Compressor overcurrentShortage of refrigerant amount Short-circuit Defect of compressor
72System No. 2Fan motor overcurrentDefect of fan motor connector contactDefect of fan motor Defect of PCB
73System No. 2Malfunction of high pressure (HPS) actuatedDirty heat exchanger Clogged refrigerant piping Defect of HPSShortage of water volume Defect of connector contact
74System No. 2Malfunction of low pressure switch (LPS)Clogged refrigerant piping Shortage of gasDefect of connector contact Defect of LPS
75System No. 2Malfunction of low pressure sensorDefect of connector contact Defect of PCBDefect of low pressure sensor
76System No. 2Malfunction of high pressure sensorDefect of connector contact Defect of PCBDefect of high pressure sensor

Daikin Air Conditioner Troubleshooting

The light is off on my air conditioner.
  • Has the fuse blown?
  • Is the power connected to the power port?
  • Has there been a recent power failure?
  • Have the batteries in the controller failed?
  • Have you set the timer correctly?
The air conditioner is not heating or cooling the room properly.
  • Have you set the temperature and operating mode correctly on the remote controller?
  • How clean are the air filters?
  • Are any only close to the air conditioner blocking the airflow?
  • Have you closed all the windows and doors?
  • Is the ventilation fan working?
The air conditioner unit has stopped and a light is flashing.
  • How clean are the air filters? If possible clean the air filters and restart the unit.
  • Check to see if any objects are blocking the air inlet and outlet of both the indoor and outdoor unit.
There is an odour coming from my air conditioner.
  • A minute amount of ozone is emitted during the purifying process which causes no health issues.
  • When the mould proof function is enabled this can cause an odour if there is an increase in humidity.
My remote controller display is fading.
  • You will need to replace the batteries. Use alkaline batteries which should last one year.
Can I operate my air conditioner without the remote controller?
  • You can press the ON/OFF button on the main unit. The operation mode will be set to automatic.
I have water leaking from the indoor air conditioner unit?
  • Do not operate the aircon and unplug the power then contact the provider or your local air conditioner technician.
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Daikin Split Type Air Conditioning

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