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Daikin Air Conditioner Error Codes
Every Daikin Air Conditioner code in the database, with its meaning. Open a code for its causes, the checks to run in order, and how to clear it.
| Code | Meaning | Fix level |
|---|---|---|
A0 | External protection device has activated | Call a professional |
A1 | Indoor unit control board fault | Call a professional |
A3 | Drain water level is too high | DIY checks first |
A5 | Freeze-up protection in cooling, high-pressure control in heating | DIY checks first |
A6 | Indoor fan motor fault | Call a professional |
A7 | Swing flap (louvre) motor fault | DIY checks first |
A9 | Electronic expansion valve fault (indoor unit) | Call a professional |
AH | Air cleaner dust collector fault | DIY checks first |
C4 | Indoor heat exchanger liquid pipe thermistor fault | Call a professional |
C5 | Indoor heat exchanger gas pipe thermistor fault | Call a professional |
C7 | Front panel drive motor fault | DIY checks first |
C9 | Indoor suction air thermistor fault | Call a professional |
CC | Humidity sensor fault | Call a professional |
E0 | Outdoor unit protection device has activated | Call a professional |
E1 | Outdoor unit control board fault | Call a professional |
E3 | High pressure switch has activated | DIY checks first |
E4 | Low pressure switch has activated | Call a professional |
E5 | Inverter compressor motor lock or overheat | Call a professional |
E6 | Standard compressor motor overcurrent or lock | Call a professional |
E7 | Outdoor fan motor fault | DIY checks first |
E8 | Inverter compressor overcurrent | Call a professional |
E9 | Electronic expansion valve coil fault (outdoor unit) | Call a professional |
EA | Four-way valve or cool/heat switching fault | Call a professional |
F3 | Discharge pipe temperature fault | Call a professional |
F6 | Abnormal high pressure or refrigerant overcharged | Call a professional |
H0 | Compressor sensor system fault | Call a professional |
H3 | High pressure switch fault | Call a professional |
H6 | Compressor position detection sensor fault | Call a professional |
H7 | Outdoor fan motor signal fault | Call a professional |
H8 | Compressor input current (CT) system fault | Call a professional |
H9 | Outdoor air thermistor fault | Call a professional |
J3 | Discharge pipe thermistor fault | Call a professional |
J5 | Suction pipe thermistor fault | Call a professional |
J6 | Outdoor heat exchanger thermistor fault | Call a professional |
L3 | Electrical component box overheating | DIY checks first |
L4 | Inverter cooling fin overheating | DIY checks first |
L5 | Inverter instantaneous overcurrent (DC output) | Call a professional |
L8 | Inverter compressor overcurrent (overload) | Call a professional |
L9 | Inverter compressor start-up error | Call a professional |
P4 | Inverter cooling fin temperature sensor fault | Call a professional |
PJ | Outdoor unit capacity setting fault | Call a professional |
U0 | Shortage of refrigerant | Call a professional |
U2 | Power supply fault or momentary power failure | DIY checks first |
U4 | Indoor–outdoor transmission (communication) error | DIY checks first |
U5 | Indoor unit–remote controller transmission error | Call a professional |
U8 | Main–sub remote controller transmission error | Call a professional |
UA | Improper combination of indoor and outdoor units | Call a professional |
UF | System setup not completed | Call a professional |
UH | System fault (transmission wiring or indoor board) | Call a professional |
More appliance types are being added. Codes vary by model and region.