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Error code reference
Daikin Air Conditioner Error Codes
60 error codes documented with diagnostic procedures.
Have your model number? Get codes specific to your unit.
A0Error of external protection deviceA1Indoor unit PCB abnormalityA3Drain water level system abnormalityA5Freeze-up protection control or heating peak-cut control activated due to abnormal indoor…A6Indoor unit fan motor abnormalityA7Swing flap motor abnormality/lockA8Abnormal power supply voltageA9Electronic expansion valve coil abnormalityAFHumidifier or related abnormalityAJCapacity setting abnormalityC1Transmission error between indoor unit PCB and fan PCB (FBQ only).C4Heat exchanger (liquid pipe) thermistor abnormalityC5Heat exchanger (gas pipe) thermistor abnormalityC6Combination error between indoor unit PCB and fan PCBC7Front panel open/close fault on CTXG series.C9Suction air thermistor abnormalityCCHumidity sensor system abnormalityCEPresence sensor or floor sensor abnormalityCJRoom temperature thermistor in remote controller abnormalityE1Outdoor unit PCB abnormalityE2Branch provider (BP) unit PCB abnormalityE3Actuation of high pressure switchE4Actuation of low pressure sensorE5Inverter compressor motor lockE7Outdoor unit fan motor abnormalityE9Electronic expansion valve coil abnormality (outdoor)F3Discharge pipe temperature abnormalityF6Refrigerant overchargedH3High pressure switch system abnormalityH7Outdoor unit fan motor signal abnormalityH9Outdoor air thermistor abnormalityJ0Branch provider (BP) liquid or gas pipe thermistor abnormalityJ3Discharge pipe thermistor abnormalityJ5Suction pipe thermistor abnormalityJ6Outdoor unit heat exchanger thermistor abnormalityJ7Outdoor liquid pipe thermistor (R7T) abnormalityJ9Subcooling heat exchanger gas pipe thermistor (R6T) abnormalityJAHigh pressure sensor abnormalityJCLow pressure sensor abnormalityL1Outdoor unit PCB abnormalityL4Radiation fin temperature riseL5Momentary overcurrent of inverter compressorL8Inverter current abnormalityL9Inverter startup errorLCTransmission error between control and inverter PCBP1High voltage of capacitor in main inverter circuitP4Radiation fin thermistor abnormalityU0Refrigerant shortageU2Power supply insufficient or instantaneous failureU3Check operation has not been conductedU4Transmission error between indoor units and outdoor unitsU5Transmission error between remote controller and indoor unitU8Transmission error between main and sub remote controllersU9Signal transmission error between indoor unit and outdoor unit in the same system.UAExcessive number of indoor units or mismatching refrigerant type between indoor and…UCAddress duplication of central remote controller.UETransmission error between centralized remote controller and indoor unit.UFSystem is not set yetUHSystem abnormality, refrigerant system address undefinedUJTransmission error between outdoor unit and branch provider (BP) unit
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Common questions
How do I find the error code on my Daikin Air Conditioner?
Most Daikin air conditioners show the code directly on the control panel display. If your model has no display, it can be read by entering diagnostic mode with the key sequence for your model. The full procedures include model-specific instructions for reading codes.
Are these codes specific to my model?
The codes here apply broadly to Daikin air conditioners. Meanings and diagnostic steps can vary by model and production year, so enter your model number for model-specific information and procedures.
What do I do if my code is not listed?
Some codes are model-specific or only appear in diagnostic mode. Enter your model number to get codes specific to your unit, or contact us. We update the database continuously from manufacturer service documentation.
How much does it cost to access the full diagnostic procedures?
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