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 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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