Daikin Indoor Unit Error Codes

A0    External protection device activated
A1    Malfunction of indoor unit PCB
A3    Malfunction of drain Level control system   
A4    Malfunction of freezing protection
A5    High-pressure
A6    Fan motor locked, overload, overcurrent
A7    Malfunction of the swing flap motor
A8    Malfunction of power supply
A9    Malfunction of electronic expansion valve drive Defect of electronic expansion valvecoil

Defect of indoor unit PCB

Defect of connector contact                   

AA    Heater overheat    26WH is activated                       

AF    Malfunction of a humidifier system Water leakage of the humidifier (option)

Failure of swing float switch

Improper drain piping incline               

AH    Malfunction of the dust collector of air cleaner    Defect of dust collecting element

Defect of high voltage power supply unit

 

Error Malfunction of indoor unit PCB   

AJ    Malfunction of capacity setting
C1    Failure of the transmission
C4    Malfunction of liquid pipe thermistor
C5      Malfunction of gas pipe thermistor for heat exchanger Defect of connector contact Connection failure of connector wiring Breakdown of the thermistor for heat exchanger Defect or failure of main PCB

The Influence of Defect Gas Pipe in Thermistor Heat Exchanger

C6    Malfunction of fan motor control driver   
C7      Front panel driving motor fault
C9    Malfunction of suction air thermistor
CA      Malfunction of discharge air thermistor Defect of connector contact Defect of the thermistor for discharge air CC Malfunction
CJ    Malfunction of room temperature sensor in the remote controller.

Daikin Outdoor Unit Error Codes

E1-Lack of refrigerant
E2-High pressure protection
E3-Low pressure protection
E4-Outdoor thermistor
E5-Indoor thermistor
E6-Outdoor ambient temperature sensor error
E7-Outdoor ambient temperature sensor error
E8-Indoor ambient temperature sensor error
E9-Heat sink temperature sensor error
EA – EEPROM error
EC – Malfunction of drain Level control system
EF – Malfunction due to blockage of the fan motor
F3: Outdoor ambient temperature sensor failure.
F6: Indoor ambient temperature sensor failure.
H0 – Non-volatile memory error
H1 – Malfunction of the indoor unit PCB
H2 – Malfunction of the outdoor unit PCB
H3 – Malfunction of the indoor/outdoor unit PCB communication
H4 – Malfunction of the indoor unit fan motor
H5 – Malfunction of the outdoor unit fan motor
H6 – Malfunction of the outdoor ambient temperature sensor or malfunction of the outdoor unit compressor discharge temperature sensor
H7 – Malfunction of the indoor unit evaporator temperature sensor
H8 – Refrigerant leakage detection (indoor unit)
H9 – Refrigerant leakage detection (outdoor unit)
HC – High pressure switch circuit malfunction
HF – High-temperature protection of the compressor motor
HJ – High-pressure protection
J1: Malfunction of drain Level control system
J2: Malfunction of a drain pump
J3: Malfunction of the drain hose
J4: Malfunction of drain motor
J5: Malfunction of the drain pan switch
J6: Malfunction of LLS sensor or LLS sensor harness defective
J7: Malfunction of discharge temperature thermistor
J8: Malfunction of discharge temperature thermistor harness (open circuit)
J9: Malfunction of discharge temperature thermistor harness (short circuit)
JA: Indoor unit PCB error
JE: Indoor / outdoor unit communication error
JC: Outdoor unit PCB error
JF: Outdoor unit address setting error
JH: The size of the indoor unit does not match the outdoor unit
L0: No error
L1: Indoor pipe temperature sensor open or short-circuited.
L3: Outdoor pipe temperature sensor open or short-circuited.
L4: Sub-cool Heat Exchanger High-Pressure Protection (Discharge Pipe Sensor)
L5: Sub-cool Heat Exchanger Low-Pressure Protection (Suction Pipe Sensor)
L6: Communication error between the indoor and outdoor units.
L8: Malfunction of drain Level control system.
L9: Malfunction of the drain pump.
LA. Leakage of refrigerant (freezing of liquid pipe).
LC- Malfunction in DC fan motor.
P0 Error: Malfunction of indoor unit PCB
P1 Error: Malfunction of outdoor unit PCB
P2 Error: Malfunction of room temperature thermistor
P3 Error: Malfunction of drain level control system
P4 Error: Malfunction of pipe temperature thermistor
P8 Error: Malfunction of sub-cool heat exchanger thermistor (Outdoor unit)
P9 Error: Malfunction of liquid pipe thermistor (Outdoor unit)
U0 Indoor/outdoor unit communication fault
U1 Zero-cross signal detection fault
U2 Malfunction of drain level control system
U3 Malfunction of drain pump
U4 Heat exchanger temperature sensor fault
U5 Malfunction of outdoor temperature sensor
U6 Malfunction of evaporator temperature sensor
U7 Malfunction of optical fiber transmission system between outdoor and indoor units
U8 Malfunction of inverter PCB (speed control system)
U9 Indoor/outdoor unit parameter setting fault