Daikin error code check

Quote from admin on February 25, 2026, 1:31 pm

When your Daikin air conditioner’s green operation light starts flashing, it is the system’s way of saying it has detected a problem. While this might seem stressful, Daikin units are equipped with a sophisticated self-diagnosis system that can tell you exactly what is wrong via a two-digit error code.

Here is a guide on how to perform a Daikin error code check and what those codes actually mean.

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How to Check the Error Code

You don't need special tools to find the error code; you can do it using your standard wireless remote controller.

Method 1: The "Cancel" Button (Most Common)

1. Point the remote at the indoor unit.

    

2. Press and hold the CANCEL button for about 5 to 6 seconds. The temperature display will change to "00" and start flashing.

    

3. Short press CANCEL repeatedly. The remote will cycle through various error codes (A1, C4, U4, etc.).

    

4. Listen for the beep:

   • Short beep: The code displayed is not the problem.

   • Two short beeps: The first character of the code matches the error.

   • Long beep: You have found the active error code.

5. Exit: To exit this mode, hold the CANCEL button for 5 seconds or leave it idle for one minute.

Method 2: Wired Remote Controllers

If you have a wall-mounted wired controller (common in SkyAir or VRV systems), the error code is often already displayed on the screen next to a blinking "Error" or "Inspection" icon. Simply press the Menu/Enter button to see the detailed malfunction code.

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Common Daikin Error Codes and Meanings

Once you have retrieved the code, you can identify the severity of the issue.

Code	Problem Type	What It Means
00	Normal	The system is functioning correctly.
U4	Communication	Indoor and outdoor units aren't "talking" to each other. Often a wiring issue.
U0	Refrigerant	Shortage of refrigerant or a clogged pipe.
A5	Temperature	Indoor heat exchanger is overheating or freezing (often due to dirty filters).
A6	Fan Motor	The indoor fan motor is locked or overloaded.
E7	Outdoor Fan	Malfunction of the outdoor unit's fan motor.
F3	Discharge	Discharge pipe temperature is too high; likely a gas leak or clog.
L5	Compressor	Overcurrent in the inverter compressor.

Simple Troubleshooting Steps

Before calling a technician, try these "quick fixes" which often resolve minor glitches:

• The 20-Minute Reset: Turn off the air conditioner and switch off the dedicated circuit breaker. Wait at least 20 minutes for the internal capacitors to discharge, then turn it back on.

• Clean the Filters: Error codes like A5 are frequently caused by restricted airflow. Remove the filters, wash them with water, dry them completely, and reinstall.

• Check Batteries: If the remote screen is faded or non-responsive, replace the batteries and try the diagnosis again.

Note: If the error persists after a reset, or if you see codes related to the compressor (E or L series) or refrigerant (U0), it is best to contact a certified Daikin professional to avoid damaging the system further.

Would you like me to look up the specific repair steps for a particular error code you've found?

This video provides a visual walkthrough of how to use the remote's cancel button to identify a specific fault code when your AC light is blinking.