Why is My Daikin Aircon Light Blinking?

A green light on your Daikin air conditioner is normal, and indicates normal functions without any internal error or issues. However, a flashing green light may indicate detected problems within your unit, which you will need to determine before you can troubleshoot the issue.

Troubleshooting Daikin Aircon Light Blinking

#1 Check for Error Codes

There are a number of common and uncommon aircon unit problems attributed to the flashing green light, and identifying the correct error code will narrow down the problem to make it easier for you to find the root cause of the issue.

See list of Daikin error codes in this guide.

Grab your original Daikin air conditioner remote controller, and see if there are any error codes flashed on the screen. If there is no error code on the LED screen of your remote controller or the indoor unit, then you will need to put your aircon unit on diagnostic mode:

1. Press and hold the Cancel button for around 5 seconds or until you hear a beep. The screen should go blank, and a '00' should display on-screen.
2. Press the Cancel button again to display the list of error codes of your unit. Scroll through the list using the Cancel button. You should hear a short beep while you scroll.
3. Keep pressing the Cancel button until a long beep rings. The error code shown on screen should indicate the problem with your unit.
4. Consult the user manual to decipher the Daikin error code, and follow the troubleshooting steps to fix the aircon issue.

#2 Check the Remote Control Battery

Error code to watch out for:

• ‍‍U5 - Malfunction of transmission between indoor unit and remote controller

The blinking light on your air conditioner may simply indicate low battery power in your remote control. Check if your remote control battery is in need of a replacement, and change the batteries as necessary. If this does not fix the blinking light problem, then your air conditioner may have an internal error.

#3 Check for a Refrigerant Leak

Error code to watch out for:

• ‍‍E6 - System No.1 Compressor overcurrent
• P0 - Shortage of refrigerant amount (thermal storage unit)
• U0 - Shortage of refrigerant

The blinking light on your Daikin aircon may be indicative of low refrigerant levels. However, refrigerant does not easily 'run out,' evaporate, or get used up, so low refrigerant levels almost always means there's a leak in your air conditioner.

A professional technician would typically use dye to follow the flow of the gas leak, and find the location of the leak to fix it. While we do not recommend handling refrigerant when untrained, you can use soapy water to find the location of the leak. Spritz the refrigerant line with soapy water, and wait for large bubbles to form, which indicates a leak.

#4 Inspect for Faulty Wiring

Error code to watch out for:

• ‍‍U7 - Malfunction of transmission between indoor units
• UH - Malfunction of system

Inspect your unit for a damaged power cord or faulty wiring, which is a common issue with Daikin aircon units. Unplug your unit from its socket for safety, and inspect your unit for damaged, bent, cut, or frayed wires.

Check the prongs of the power cord as well, and look for signs of damage such as burnt wires, bitten cords, and more. Once you've located the damaged wires, do the necessary fix to solve the problem, or contact an experienced aircon technician/electrician to safely handle the issue.

#5 Inspect for Clogged Air Filters

Error code to watch out for:

• A5 - High pressure control in heating, freeze-up protection control in cooling.

The air filter is the component in your Daikin aircon that traps dust particles, ensuring they are kept away from the internal components of your indoor unit. Dirty and clogged air filters can no longer circulate air properly, which can lead to an overheating or frozen aircon unit.

Clean the aircon filters by running the mesh under soap and water. Gently brush away the dirt, and leave the filter to dry before placing it back into the unit. Clean the evaporator coils as well to prevent frozen evaporator coils. Use a vacuum cleaner and some compressed air to dry clean these components.

When to Call a Professional Service

Troubleshooting air conditioners can be intimidating to homeowners who don't have prior experience inspecting their air conditioning unit. Licensed technicians are well-versed in different AC issues such as link blinking, and calling a professional is a surefire and safer way to troubleshoot your unit.

Luce Aircon provides top quality services for all aircon brands and models! Contact us for any issues with your Daikin aircon unit, and we'll get to the bottom of that aircon light blinking problem.

Check out our article on Daikin aircon troubleshooting!