Daikin Airconditioner error codes

Daikin Inverter AC Error Codes

Daikin Inverter AC Error Codes

Error Code Description Solution
U0 Low refrigerant in the system Check for refrigerant leaks and recharge the system with the correct amount of refrigerant.
U2 Power supply problem Ensure the power supply is stable; check for voltage fluctuations or power failures.
U4 Communication error between indoor and outdoor units Inspect the communication wiring between the units; repair or replace if necessary.
EA Outdoor unit malfunction Check the outdoor unit for issues such as fan malfunction or compressor failure. Repair or replace faulty components.
J6 Compressor overload Check the compressor for overheating; inspect for any obstructions in airflow or excessive load on the compressor.
L5 Inverter drive error Inspect the inverter drive and motor; reset or replace the inverter if it is faulty.
P1 High pressure in the system Inspect for blockages in the refrigerant line and ensure proper ventilation for the outdoor unit.
P4 Overheating of the compressor Check for proper ventilation and clean the air filters; reduce the compressor load if necessary.
P9 Outdoor air temperature sensor error Inspect the outdoor temperature sensor; replace if it is malfunctioning.
C9 Indoor air temperature sensor error Check the indoor temperature sensor; replace if necessary.

Indoor unit faults

AC Error Codes

AC Error Codes and Solutions

Press and hold the “Cancel” button for 5 seconds until the display shows “00.” Then, continue pressing the “Cancel” button one time at a time. If the AC beeps twice at any point during this process, it means you’ve found the correct code, and the AC will stop functioning.

Error Code Description Solutions
00 Normal operation No action needed
A0 External protection Check external connections and safety mechanisms
A1 PCB issue Inspect or replace the printed circuit board
A2 Interlock fan problem Verify the fan’s operation and interlock settings
A3 Drain abnormality Check for blockages in the drain pipe
A4 Temperature abnormality at heat exchanger 1 Inspect heat exchanger 1 for temperature issues
A5 Temperature abnormality at heat exchanger 2 Inspect heat exchanger 2 for temperature issues
A6 Fan motor error Check and possibly replace the fan motor
A7 Air swing motor error Inspect the air swing motor and repair if needed
A8 AC input overcurrent Check for electrical issues or overloading
A9 Expansion valve error Examine the expansion valve for any malfunction
AA Abnormal heater temperature Inspect the heater for temperature irregularities
AH Air cleaner defect Clean or replace the air cleaner
AC Ignition process issue Verify the ignition system
AJ Capacity determination device problem Check the capacity determination system
AE Insufficient water Check the water supply to the unit
AF Humidifier failure Inspect the humidifier for faults
C0 Thermistor fault Check and replace the thermistor if necessary
C1 Unspecified error Consult the manual for further troubleshooting
C2 Unspecified error Consult the manual for further troubleshooting
C3 Drain water level error Ensure the drain water level is within acceptable limits
C4 Thermistor fault at heat exchanger 1 Inspect or replace the thermistor at heat exchanger 1
C5 Thermistor fault at heat exchanger 2 Inspect or replace the thermistor at heat exchanger 2
C6 Fan motor overload Reduce load or replace the fan motor if needed
C7 Air swing motor locked Unlock or repair the air swing motor
C8 AC input overcurrent Check for electrical issues or overloading
C9 Suction line thermistor fault Check the suction line thermistor and replace if faulty
CA Air sensor error Inspect or replace the air sensor
CB Dirt sensor error Clean or replace the dirt sensor
CC Humidity sensor error Check and replace the humidity sensor if needed
CJ Remote sensor error Inspect the remote sensor for any issues
CE Radiation sensor error Check the radiation sensor for faults
CF High-pressure switch error Verify the high-pressure switch operation
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