DAIKIN Air Conditioner AC Error Codes

Is your Daikin AC showing an error code? Error codes can show on either the inside unit or the outside unit. Since these are split systems, we have broken down the error codes for each unit – outside and inside. These error codes will tell you what the issue is with your Daikin AC. Knowing the error code will assist you in finding the problem with your air conditioner and you can then fix it yourself. See below for ALL DAIKIN AC Error or Fault Codes.

DAIKIN AC ERROR CODES

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DAIKIN AC Error Codes

NOTE: This is a general “quick reference” fault code list, see further below the list for more detailed error codes, the definition of the code, and how to fix the issue.

DAIKIN AC “A” Error Codes

AO Indoor Error of external protection device
A1 Indoor PCB defect
A3 Indoor Malfunction of drain Level control system
A5 Indoor Freeze-up prevention
A6 Indoor Fan motor lock – overload
A7 Indoor Malfunction of swing motor flap
A9 Indoor Malfunction of EEV
AF Indoor Drain level above limit – clogged
AJ Indoor Malfunction of capacity set device

DAIKIN AC “C” Error Codes

C3 Indoor Malfunction of drain thermistor
C4 Indoor Malfunction of liquid pipe thermistor
C5 Indoor Malfunction of gas pipe thermistor
C7 Indoor Lower louvre limit switch – motor
C9 Indoor Malfunction of air thermistor
CC Indoor Malfunction of moisture sensor
CA Indoor Malfunction of discharge air thermistor
CJ Indoor Malfunction of remote control thermistor
CE Indoor Malfunction of radiant heat sensor

DAIKIN AC “E” Error Codes

E0 Outdoor Activation of outdoor safety device
E1 Outdoor PCB defect
E3 Outdoor Activation of high pressure switch
E4 Outdoor Activation of low pressure switch
E5 Outdoor Activation of compressor over heat protection
E5 Outdoor Compressor motor lock
E6 Outdoor Compressor start up error
E6 Outdoor Standard compressor lock overcurrent
E7 Outdoor Fan motor lock – Overload
E8 Outdoor Inverter input overcurrent
E9 Outdoor Malfunction of EEV
EA Outdoor Four way valve defective

DAIKIN AC “F” Error Codes

F3 Outdoor Abnormal discharge pipe temperature
F6 Outdoor Refrigerant overcharged
FC Outdoor Low pressure drop

DAIKIN AC “H” Error Codes

H3 Outdoor High pressure switch defect
H4 Outdoor Low pressure switch defect
H6 Outdoor Compressor motor position detection sensor error
H7 Outdoor Fan motor position detection sensor error
H8 Outdoor Current transformer error
H9 Outdoor Malfunction of air thermistor

DAIKIN AC “J” Error Codes

J1 Outdoor Faulty/Fault of pressure sensor
J2 Outdoor Current sensor Faulty/Fault
J3 Outdoor Faulty/Fault of discharge pipe thermistor
J4 Outdoor Low pressure saturation thermistor
J5 Outdoor Faulty/Fault of suction pipe thermistor
J6 Outdoor Faulty/Fault of heat exchanger thermistor
J7 Outdoor Faulty/Fault of heat exchanger liquid thermistor
J8 Outdoor Faulty/Fault of liquid pipe thermistor
J9 Outdoor Faulty/Fault of gas pipe thermistor
JA Outdoor Faulty/Fault of discharge pipe pressure sensor
JC Outdoor Faulty/Fault of suction pipe pressure sensor
JH Outdoor Faulty/Fault of oil temperature sensor

DAIKIN AC “L” Error Codes

L0 Outdoor Malfunction of inverter
L3 Outdoor Electronic component box overheat
L4 Outdoor Inverter cooling defect
L5 Outdoor Comp motor ground fault Short circuit
L6 Outdoor Compressor motor grounding short circuit
L7 Outdoor Total input overcurrent
L8 Outdoor Comp overload – Motor disconnected
L9 Outdoor Compressor lock
LA Outdoor Power unit malfunction
LC Outdoor Transmission between inverter and outdoor

DAIKIN AC “P” Error Codes

P1 Outdoor Inverter over ripple
P3 Outdoor Thermistor abnormality
P4 Outdoor Power unit humidity sensor malfunction
PJ Outdoor Failure of capacity set resistor

DAIKIN AC “U” Error Codes

U0 System Shortage of refrigerant or EEV failure
U1 System Negative phase, Open phase
U2 System Power supply insufficient
U3 System Wiring check operation not executed
U3 System Mismatch of indoor and outdoor units – Split only
U4 System Transmission between indoor units
U5 System Transmission to remote controller
U6 System Malfunction transmission outdoor to BP unit
U7 System Transmission between outdoor units
U8 System Transmission between master and slave RC
U9 System Transmission error between indoor to outdoor
UA System Excessive number of fancoils
UC System Address duplication of central controllers
UE System Transmission error between indoor and central
UF System Refrigeration system not set wiring – piping
UF System Terminals 1 and 3 crossed (Split Skyair)
UH System System error Refrigeration system set up

DAIKIN AC “M” Error Codes

M1 System PCB defect
M8 System Transmission error between central controllers
MA System Improper combination of optional controllers
MC System Address duplication Improper setting

DAIKIN AC “Number” Error Codes

64 VAM Indoor unit air thermistor error
65 VAM Outside air thermistor error
6A VAM Damper system alarm
6A VAM Damper system and thermistor error
6F VAM Malfunction of remote controller
6H VAM Malfunction of door switch or connector
94 VAM Internal transmission error

You can go to the Daikin AC error code search page here.
Error Code Search offers information on the cause of the malfunction and the status of your air conditioner by entering the error code.

Daikin AC Error Codes

Daikin AC Error Codes – Indoor Unit Error Codes

Daikin AC Error Code = A0
Error Code Definition = External protection device activated
What To Fix/Check/Replace = External protection device connected to the terminal strip T1-T2 of indoor unit is activated

Daikin AC Error Code = A1
Error Code Definition = Malfunction of indoor unit PCB
What To Fix/Check/Replace = Defective indoor unit PCB. External factor = Noise

Daikin AC Error Code = A3
Error Code Definition = Drain Level Control System Abnormality
What To Fix/Check/Replace = Drain clogging, upward slope. Defective drain pump. Defective float switch or short circuit connector.

Daikin AC Error Code = A4
Error Code Definition = Malfunction of freezing protection
What To Fix/Check/Replace = Shortage of water volume. Low water temperature setting. Defective water temperature thermistor.

Daikin AC Error Code = A5
Error Code Definition = High pressure control in heating, freeze-up protection control in cooling
What To Fix/Check/Replace = Clogged air filter of indoor unit and short circuit Defect of indoor unit heat exchanger thermistor

Daikin AC Error Code = A6
Error Code Definition = Malfunction of fan motor
What To Fix/Check/Replace = Broken wires in, short circuit of or disconnection of connectors from the fan motor harness. Defective indoor unit PCB. Defective fan motor.

Daikin AC Error Code = A7
Error Code Definition = Malfunction of swing flap motor
What To Fix/Check/Replace = Defective swing flap motor. Defective indoor unit PCB. Defective connection cable. Defective airflow direction adjusting flap-cam.

Daikin AC Error Code = A8
Error Code Definition = Malfunction of power supply or AC input overcurrent
What To Fix/Check/Replace = Defective power supply voltage. Defective connection on signal line. Defective wiring.

Daikin AC Error Code = A9
Error Code Definition = Malfunction of electronic expansion valve
What To Fix/Check/Replace = Defective electronic expansion valve coil. Defective indoor unit PCB. Defective relay cables.

Daikin AC Error Code = AA
Error Code Definition = Heater overheat
What To Fix/Check/Replace = 26WH is activated

Daikin AC Error Code = AF
Error Code Definition = Malfunction of a humidifier system
What To Fix/Check/Replace = Humidifier unit leaking. Defective drain piping. Defective indoor unit PCB.

Daikin AC Error Code = AH
Error Code Definition = Malfunction of dust collector of air cleaner
What To Fix/Check/Replace = Defect of dust collecting element. Stained insulator part. Defect of high voltage power supply unit. Defect of indoor unit PCB.

Daikin AC Error Code = AJ
Error Code Definition = Malfunction of capacity setting (Indoor unit PCB)
What To Fix/Check/Replace = The capacity setting adaptor was not installed when replacing PCB. Defective indoor unit PCB.

Daikin AC Error Code = C1
Error Code Definition = Failure of transmission (between indoor unit PCB and sub PCB)
What To Fix/Check/Replace = Defective connection of the connector between indoor unit PCB

Daikin AC Error Code = C4
Error Code Definition = Malfunction of liquid pipe thermistor for heat exchanger.
What To Fix/Check/Replace = Defective thermistor for liquid pipe. Defective indoor unit PCB. Defective connector contact.

Daikin AC Error Code = C5
Error Code Definition = Malfunction of gas pipe thermistor for heat exchanger.
What To Fix/Check/Replace = Defective thermistor for gas pipe. Defective indoor unit PCB. Defective connector contact.

Daikin AC Error Code = C6
Error Code Definition = Malfunction of fan motor sensor or fan control driver.
What To Fix/Check/Replace = Defective fan PCB. Defective connection of capacity setting adaptor field setting error.

Daikin AC Error Code = C7
Error Code Definition = Front panel driving motor fault.
What To Fix/Check/Replace = Defective front panel driving motor defective limit switch.

Daikin AC Error Code = C9
Error Code Definition = Malfunction of suction air thermistor.
What To Fix/Check/Replace = Defective thermistor for suction air. Defective indoor unit PCB. Defective connector contact.

Daikin AC Error Code = CA
Error Code Definition = Malfunction of discharge air thermistor.
What To Fix/Check/Replace = Defective thermistor for discharge air. Defective indoor unit PCB. Defective connector contact.

Daikin AC Error Code = CC
Error Code Definition = Malfunction of humidity sensor system.
What To Fix/Check/Replace = Defective humidity sensor defective connector contact.

Daikin AC Error Code = CJ
Error Code Definition = Room temperature thermistor in remote controller abnormality.
What To Fix/Check/Replace = Defective room temperature thermistor in remote controller. Defective remote controller PCB.

Daikin AC Error Codes – Outdoor Unit Error Codes

Daikin AC Error Code = E0
Error Code Definition = Protection devices activated
What To Fix/Check/Replace = Protection device connected to outdoor unit PCB actuated Defective protection device connector contact

Daikin AC Error Code = E1
Error Code Definition = Defective outdoor unit PCB
What To Fix/Check/Replace = Defective connection of inside/ outside relay wires

Daikin AC Error Code = E3
Error Code Definition = Actuation of high pressure switch
What To Fix/Check/Replace = Dirty outdoor unit heat exchanger – Defective high pressure switch – Clogged refrigerant piping – Defective connector contact

Daikin AC Error Code = E3
Error Code Definition = Dirty outdoor unit heat exchanger
What To Fix/Check/Replace = Actuation of high pressure switch – Shortage of water volume – Clogged refrigerant piping – Defective connector contact – Defective HPS

Daikin AC Error Code = E4
Error Code Definition = Actuation of low pressure switch (LPS) – Abnormally drop in low pressure
What To Fix/Check/Replace = Defective low pressure sensor – Defective outdoor unit PCB – Defective connector contact

Daikin AC Error Code = E5
Error Code Definition = Inverter compressor motor or overheat – Inverter compressor lock – High differential pressure
What To Fix/Check/Replace = Defective inverter PCB – UVW connection error – Defective connector contact

Daikin AC Error Code = E6
Error Code Definition = Compressor motor overcurrent lock – Defective compressor
What To Fix/Check/Replace = Defective control PCB – The stop valve is not opened

Daikin AC Error Code = E6
Error Code Definition = Compressor overcurrent – Defective electronic expansion valve
What To Fix/Check/Replace = Shortage of refrigerant amount – Defective compressor

Daikin AC Error Code = E7
Error Code Definition = Malfunction of outdoor unit fan motor system – Fan motor failure
What To Fix/Check/Replace = Defective connection of harness connector between the fan motor and the PCB – Fan does not rotate due to jammed

Daikin AC Error Code = E8
Error Code Definition = Overcurrent of inverter compressor – Defective compressor
What To Fix/Check/Replace = Defective inverter main circuit capacitor – Defect of outdoor unit PCB – Defect of power transistor

Daikin AC Error Code = E9
Error Code Definition = Malfunction of electronic expansion valve coil – Disconnection of connectors from electronic expansion valves
What To Fix/Check/Replace = Defective electronic expansion valve coil – Defective outdoor unit control PCB

Daikin AC Error Code = EA
Error Code Definition = Malfunction of four way valve or cool/heat switch – Defective four way valve
What To Fix/Check/Replace = Shortage of gas – Defective outdoor unit PCB – Defective thermistor

Daikin AC Error Code = EC
Error Code Definition = Malfunction of entering water temperature – Cooling water temperature abnormality
What To Fix/Check/Replace = Defective outdoor unit PCB Defective thermistor

Daikin AC Error Code = F3
Error Code Definition = Malfunction of discharge pipe temperature – Defective discharge pipe thermistor – Abnormal discharge pipe temperature
What To Fix/Check/Replace = Defective outdoor unit control PCB – Defective connector contact

Daikin AC Error Code = F6
Error Code Definition = Abnormal high pressure or refrigerant overcharged
What To Fix/Check/Replace = Refrigerant overcharged – Disconnection of heat exchanger thermistor – Disconnection of outdoor air thermistor – Disconnection of liquid pipe temperature thermistor – Defective outdoor unit PCB

Daikin AC Error Code = H0
Error Code Definition = Malfunction of sensor system of compressor
What To Fix/Check/Replace = Harness is disconnected – Defective connection – Defective PCB

Daikin AC Error Code = H1
Error Code Definition = Malfunction of room temperature sensor or humidifier unit damper
What To Fix/Check/Replace = Defective limit switch Defective damper

Daikin AC Error Code = H3
Error Code Definition = Malfunction of high pressure switch – Defective high pressure switch Broken wire
What To Fix/Check/Replace = Defective outdoor unit PCB – Defective connector contact

Daikin AC Error Code = H4
Error Code Definition = Malfunction of low pressure switch – Defective low pressure switch
What To Fix/Check/Replace = Broken wire – Defective outdoor unit PCB – Defective connector contact

Daikin AC Error Code = H5
Error Code Definition = Malfunction of compressor motor overload thermistor
What To Fix/Check/Replace = Defect of compressor motor overload thermistor – Defective connector contact

Daikin AC Error Code = H6
Error Code Definition = Malfunction of position detection sensor
What To Fix/Check/Replace = Faulty contact of compress or cable – Defective compressor – Defective outdoor unit PCB

Daikin AC Error Code = H7
Error Code Definition = Malfunction of outdoor unit fan motor signal – Abnormal signal from fan motor
What To Fix/Check/Replace = Circuit failure – Disconnection Short circuit in fan motor leads – Disconnection of connector – Defective inverter PCB

Daikin AC Error Code = H8
Error Code Definition = Malfunction of compressor input system
What To Fix/Check/Replace = Defective power transistor – Defective reactor – Faulty wiring of inverter system – Defective outdoor unit PCB

Daikin AC Error Code = H9
Error Code Definition = Malfunction of outdoor air thermistor
What To Fix/Check/Replace = Defective connection of thermistor – Defective outdoor unit PCB – Defective outdoor air thermistor

Daikin AC Error Code = HC
Error Code Definition = Malfunction of water temperature thermistor
What To Fix/Check/Replace = Defective connection of thermistor – Defective outdoor unit PCB – Defective water temperature thermistor

Daikin AC Error Code = HF
Error Code Definition = Alarm in thermal storage unit or storage controller – Thermal storage group defective wiring
What To Fix/Check/Replace = Defective setting – Excess of thermal storage tank numbers

Daikin AC Error Code = HJ
Error Code Definition = Malfunction of thermal storage tank water level – Low water level
What To Fix/Check/Replace = Defective switch setting – Water level detecting sensor failure – Defective connector contact

Daikin AC Error Code = J1
Error Code Definition = Malfunction of pressure sensor
What To Fix/Check/Replace = Defective pressure sensor connector contact – Defective pressure sensor – Defective outdoor unit PCB

Daikin AC Error Code = J2
Error Code Definition = Malfunction of current sensor of compressor
What To Fix/Check/Replace = Defective current sensor – Defective compressor – Defective outdoor unit PCB

Daikin AC Error Code = J3
Error Code Definition = Malfunction of discharge pipe thermistor
What To Fix/Check/Replace = Defective connection of thermistor – Defective discharge pipe thermistor – Defective outdoor unit PCB

Daikin AC Error Code = J4
Error Code Definition = Malfunction of low pressure equivalent saturated temperature sensor system
What To Fix/Check/Replace = Defective connection of thermistor – Defective thermistor – Defective outdoor unit PCB

Daikin AC Error Code = J5
Error Code Definition = Malfunction of suction pipe thermistor
What To Fix/Check/Replace = Defective connection of thermistor – Defective suction pipe thermistor – Defective outdoor unit PCB

Daikin AC Error Code = J6
Error Code Definition = Malfunction of heat exchanger thermistor
What To Fix/Check/Replace = Defective connection of thermistor – Defective heat exchanger thermistor – Defective outdoor unit PCB

Daikin AC Error Code = J7
Error Code Definition = Malfunction of thermistor (Refrigerant circuit)
What To Fix/Check/Replace = Defective connection of thermistor – Defective liquid pipe thermistor – Defective outdoor unit PCB

Daikin AC Error Code = J8
Error Code Definition = Malfunction of thermistor (Refrigerant circuit)
What To Fix/Check/Replace = Defective connection of thermistor – Defective liquid pipe thermistor – Defective outdoor unit PCB

Daikin AC Error Code = J9
Error Code Definition = Malfunction of thermistor (Refrigerant circuit)
What To Fix/Check/Replace = Defective connection of thermistor – Defective gas pipe thermistor – Defective outdoor unit PCB

Daikin AC Error Code = JA
Error Code Definition = Malfunction of high pressure sensor
What To Fix/Check/Replace = Defective connector contact – Connection of low pressure sensor in mistake for high pressure sensor – Defective high pressure sensor – Defective outdoor unit PCB

Daikin AC Error Code = JC
Error Code Definition = Malfunction of low pressure sensor
What To Fix/Check/Replace = Defective connector contact – Connection of high pressure sensor in mistake for low pressure sensor – Defective low pressure sensor – Defective outdoor unit PCB

Daikin AC Error Code = JE
Error Code Definition = Malfunction of oil pressure sensor or sub-tank thermistor
What To Fix/Check/Replace = Defective connector contact – Defective sub tank thermistor – Defective outdoor unit PCB

Daikin AC Error Code = JF
Error Code Definition = Malfunction of oil level sensor or heating heat exchanger thermistor
What To Fix/Check/Replace = Defective connector contact – Defective heat exchanger thermistor – Defective outdoor unit PCB

Daikin AC Error Code = L0
Error Code Definition = Malfunction of inverter system
What To Fix/Check/Replace = Shortage of power supply capacity – Defective power transistor – Defective outdoor unit PCB

Daikin AC Error Code = L1
Error Code Definition = Malfunction of inverter PCB
What To Fix/Check/Replace = Defective compressor wiring – Defective outdoor unit fan motor – Blown fuse – Defective inverter PCB

Daikin AC Error Code = Daikin AC Error Code = L3
Error Code Definition = Temperature rise due to short circuit
What To Fix/Check/Replace = Defective outdoor unit fan motor – Defective power transistor – Defective outdoor unit PCB

Daikin AC Error Code = L4
Error Code Definition = Malfunction of inverter
What To Fix/Check/Replace = Short circuit thermistor

Daikin AC Error Code = L5
Error Code Definition = Inverter overcurrent (DC output)
What To Fix/Check/Replace = Defective compressor coil – Compressor startup failure – Defective inverter PCB

Daikin AC Error Code = L6
Error Code Definition = Inverter instantaneous overcurrent (AC output)
What To Fix/Check/Replace = Overcharge of refrigerant amount – Shortage of power supply capacity – Defective compressor Defective inverter unit

Daikin AC Error Code = L8
Error Code Definition = Malfunction of overcurrent inverter compressor – Compressor overloaded
What To Fix/Check/Replace = Wiring disconnection in compressor coil – Disconnection of compressor wiring – Defective inverter PCB

Daikin AC Error Code = L9
Error Code Definition = Malfunction of inverter compressor startup error – The stop valve is not opened
What To Fix/Check/Replace = Defective compressor – Error in wire connections to compressor – Large differential pressure before compressor startup Defective inverter PCB

Daikin AC Error Code = LA
Error Code Definition = Malfunction of power transistor
What To Fix/Check/Replace = Defective power transistor – Defective compressor – Defective inverter PCB

Daikin AC Error Code = LC
Error Code Definition = Malfunction of transmission between control and inverter PCB
What To Fix/Check/Replace = Defective connection between the inverter PCB and the control PCB – Defective inverter compressor – Defective control PCB

Daikin AC Error Code = M1
Error Code Definition = Malfunction of central remote controller PCB
What To Fix/Check/Replace = Defective central remote controller PCB

Daikin AC Error Code = M8
Error Code Definition = Malfunction of transmission between optional controllers for centralized control – Centralized control power disconnection
What To Fix/Check/Replace = Centralized control reset switch ON – Defective transmission wiring – Central remote controller change

Daikin AC Error Code = MA
Error Code Definition = Improper combination of optional controllers for centralized control – Improper combination of optional controllers for centralized control
What To Fix/Check/Replace = More than one master controller is connected – Faulty setting of centralized control – Defect of centralized control

Daikin AC Error Code = MC
Error Code Definition = Address duplication
What To Fix/Check/Replace = Improper setting – Address duplication of central remote controller

Daikin AC Error Code = P0
Error Code Definition = Shortage of refrigerant amount – Shortage of refrigerant
What To Fix/Check/Replace = Clogged refrigerant piping

Daikin AC Error Code = P1
Error Code Definition = Power voltage imbalance or inverter PCB – Open phase
What To Fix/Check/Replace = Interphase voltage imbalance – Defective capacitor in the main circuit – Defective wiring in the main circuit – Defective inverter PCB

Daikin AC Error Code = P2
Error Code Definition = Automatic refrigerant charge operation stop
What To Fix/Check/Replace = The stop valve is not opened Closed valve of refrigerant tank

Daikin AC Error Code = Daikin AC Error Code = P3
Error Code Definition = Malfunction of thermistor in switch box
What To Fix/Check/Replace = Defective connection of thermistor – Defective reactor thermistor – Defective inverter PCB

Daikin AC Error Code = P4
Error Code Definition = Malfunction of temperature sensor
What To Fix/Check/Replace = Defective temperature thermistor – Defective inverter PCB – Defective compressor – Defective fan motor

Daikin AC Error Code = P8
Error Code Definition = Heat exchanger freezing protection during automatic refrigerant charging
What To Fix/Check/Replace = Close refrigerant cylinder

Daikin AC Error Code = P9
Error Code Definition = Malfunction of fan motor humidifier unit
What To Fix/Check/Replace = Defective fan motor – Defective outdoor unit PCB – Broken relay harness – Defective connector contact

Daikin AC Error Code = PA
Error Code Definition = Broken wire of heater (humidifier unit)
What To Fix/Check/Replace = Defective heater unit – Defective thermistor – Defective outdoor unit PCB

Daikin AC Error Code = PH
Error Code Definition = Refrigerant cylinder during automatic refrigerant charging
What To Fix/Check/Replace = Defective heater unit – Defective connector contact – Defective thermistor – Defective outdoor unit PCB

Daikin AC Error Code = PJ
Error Code Definition = Malfunction of capacity setting – Capacity setting adaptor is not installed
What To Fix/Check/Replace = Improper capacity setting adaptor – Defective outdoor unit PCB

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