Daikin Air Conditioner Troubleshooting Guide

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Common Problems with the Daikin Air Conditioner

Problem Possible Causes Solutions
AC is Dripping Water Frozen AC unit; Dirty filters and coils; Clogged drain line; Refrierant leak. Thaw out the ice, clean your unit. Contact a technician for refrigerant issues.
AC is Not Cooling Properly Small unit for the size of the room; Dirty filters and coils; Refrigerant leak; Compressor issues. Have your unit checked for faulty parts.
Remote Controller has a Miscommunication Low batteries; Locked buttons Unlock buttons; Replace batteries.
Air Conditioner Won't Turn On Unplugged unit or Electrical problems Plug in the unit, reset the AC; Contact an electrician for wiring issues.
AC is Making a Whirring Noise Faulty fan motor Replace fan motor.

#1 Daikin Air Conditioner is Dripping Water

If your AC system is dripping water, it is possible you have a frozen AC due to a dirty air filter and evaporator coil. Thaw out the ice, clean your unit, and let the air filter dry before placing it back into the air conditioner to fix the problem.

You may also have a refrigerant leak, which in this case, contact an aircon servicing in Singapore to fix the problem for you, as the coolant used in air conditioners can be dangerous to your skin and respiratory system when exposed to the substance for a significant amount of time.

#2 Daikin Air Conditioner is Not Cooling Properly

Two ways your AC might not be cooling properly: (1) the AC system is blowing cool air, but is not cooling the room; and (2) the AC system is blowing warm air instead of cold air. For the first reason, it may be because your cooling system is too weak for the size of the room. Consider upgrading your unit, or moving it to a smaller room.

For the second reason, you may have dirty air filters, a refrigerant leak, a failing compressor, or restricted air flow volume around your air conditioner unit. Clean the air filter to see if this fixes the problem. If it does not, it is best to contact a specialist for an accurate diagnosis, repair, and maintenance of your unit.

#3 Daikin Air Conditioner Remote Controller has a Miscommunication

First, make sure the power cord of your indoor unit is securely plugged in. Check if your remote control pad has locked buttons, and unlock it by following the guide in your owner's manual. Check the batteries as well, and replace any dead batteries with fresh ones. Make sure you're pointing the remote controller to the air conditioner for a direct connection.

#4 Daikin Air Conditioner Won't Turn On

An air conditioner that won't turn on almost always has an electrical problem, which is often an issue with a blown fuse in the circuit breaker box. Unplug the power cord of your unit, check the circuit breaker for any tripped circuits, and flip the switch back to its original position. Your AC unit should function properly again.

#5 Daikin Air Conditioner is Making a Whirring Noise

The whirring noise coming from your air conditioner is a sign of a faulty fan motor, worn compressor, or bent fan blades depending on the frequency of the sound. A high-pitched whirring noise would indicate a worn down compressor that needs replacement, while a faulty fan motor would have a low, deep-sounding whirr. Bent fan blades sound like a clunking noise.

How to Reset Your Daikin Air Conditioner

Reset Point: Power Button

To reset your Daikin air conditioner, locate the ON/OFF power button on your unit. Press and hold the power button for 2 seconds, then press the button again to power off the air conditioning unit. Wait for 30 seconds, then press the power button once more to power on the AC unit. Your Daikin AC should be fully restarted.

Daikin Air Conditioner Troubleshooting Guide

#1 Check Your Owner's Manual

Always check your owner's manual first whenever there is a problem with your unit. Air conditioning systems come with manuals that provide information such as error codes, common problems with descriptions, and troubleshooting guides.

Identify the error code flashed on your air conditioning unit, and follow the troubleshooting guide included in your owner's manual. This should help solve common aircon issues. However, advanced problems may require the expertise of aircon technicians.

#2 Keep a Schedule for Cleaning and Replacements

Some components in an air conditioner, such as the air filters and coils, will need cleaning once every two weeks. The AC system should show a green flashing light when it's time to clean or replace the dust box. Other components must be replaced every few years to keep your unit up and running smoothly for a longer period of time.

Keep a schedule of aircon cleaning and replacement routine to know exactly when it is time to clean your air conditioning unit, or to replace any faulty, worn down parts in your AC system. Take note of the green flashing light as well. This will help keep you on track, and prevent damages to your air conditioning systems.

#3 Reset Daikin Air Conditioner

Resetting your Daikin air conditioner may help reboot the system, wiping any glitches or malfunctioning settings. To reset the Daikin air conditioner, turn the air conditioner off. Wait for 5 minutes, then turn the AC unit back on again. If the problem persists, use a pen or cellphone ejector pin to press the reset button on your Daikin air conditioner remote controller.

Common Error Codes

Error Code Meaning
A0 The external protection device is activated, connected to the terminal strip.
A1 Malfunctioning Printed Circuit Board (PCB) - indoor unit.
A3 Drain Level Control System Abnormality.
A4 Malfunction of the freeze-protection feature.
A5 High pressure control in heating; freeze-up protection control in cooling
A6 Malfunctioning fan motor.
A7 Malfunctioning swing flap motor
A8 Malfunction in the power supply, or AC input overcurrent.
A9 Malfunction in the electronic expansion valve.
AA Heater is overheating.
AF Malfunctioning humidifier system.
AH Malfunction of the dust collector in the air cleaner.
AJ Malfunction of the capacity setting - indoor unit Printed Circuit Board (PCB).
C1 Failure of transmission - between indoor unit PCB and sub PCB.
C4 Malfunctioning liquid pipe thermistor for heat exchanger.
C5 Malfunctioning gas pipe thermistor for heat exchanger.
C6 Malfunctioning fan motor sensor or fan control driver.
C7 Faulty front panel driving motor.
C9 Malfunction in the suction air thermistor.
CA Malfunction in the discharge air thermistor.
CC Malfunctioning humidity sensor system.
CJ Abnormality in the room temperature thermistor of the remote controller.

If you want the full list of Daikin error codes, then please proceed here.

Maintaining Your Daikin Air Conditioner

Whether you have a window-type, mini split, portable, or ducted air conditioner, you can always look to Luce Aircon to be your number one partner in all things air conditioner! Our air conditioning technician team will be able to fix your unit no matter what brand or model, and refresh the components inside your air conditioning system!

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