Search
Close this search box.

How to Reset a Daikin Air Conditioner

Author Rod Marchant-Smith | Peninsula Air Conditioning

Dealing with a malfunctioning air conditioning system can be frustrating, but resetting your Daikin air conditioner can often resolve many common issues. This updated guide for 2024 provides step-by-step instructions on how to reset Daikin ducted air conditioner units, split-system and multi-split system units, decoding error codes, and troubleshooting common problems.

Simple Steps to Reset Your Daikin Air Conditioning Unit

Resetting a Daikin air conditioning unit is straightforward. Whether it’s a standard model or a Daikin ducted air conditioner, the reset process is the same and can be done using the remote control:

  1. Find the On/Off button on your Daikin air conditioner’s remote.
  2. Press and hold this button for two seconds.
  3. Release the button, then press it once more. 
  4. Finally, press it a third time. Your Daikin air conditioner should reset and start running again.

This method also applies if your Daikin AC is not turning on or you need to perform a hard reset on the unit.

Resetting Daikin Error Codes

Resetting Daikin air conditioning error codes requires a few more steps:

Enter Diagnostic Mode: Using your AC remote, press and hold the cancel button for five seconds until “00” flashes at the top of the remote.

Accessing the Code: Release the button, then press the cancel button again until you hear a long beep. A double-digit code will appear on your remote.

Understanding the Error Code: Note the code and refer to the list below to understand the fault.

Note: If you encounter complex error codes or persistent issues, such as your Daikin air conditioner not starting or other faults that cannot be resolved with a reset, professional assistance may be required.

Fault diagnosis by remote controller

The remote controller can receive relevant error codes from the indoor unit.

When is held down for about 5 seconds, “00” blinks in the temperature display section.

Press repeatedly until a long beep is produced.
  • The code indication changes as shown below, and notifies with a long beep.
SYSTEM CODE MEANING
00 NORMAL
UA INDOOR-OUTDOOR UNIT COMBINATION FAULT
U0 REFRIGERANT SHORTAGE
U2 DROP VOLTAGE OR MAIN CIRCUIT OVERVOLTAGE
U4 FAILURE OF TRANSMISSION (BETWEEN INDOOR UNIT AND OUTDOOR UNIT)
INDOOR UNIT A1 INDOOR PCB DEFECTIVENESS
A5 FREEZE-UP PROTECTOR
A6 FAN MOTOR FAULT
C4 FAULTY HEAT EXCHANGER TEMPERATURE SENSOR
C9 FAULTY SUCTION AIR TEMPERATURE SENSOR
OUTDOOR UNIT E1 CIRCUIT BOARD FAULT
E5 OL STARTED
E6 FAULTY COMPRESSOR START UP
E7 DC FAN MOTOR FAULT
E8 OVERCURRENT INPUT
F3 HIGH TEMPERATURE DISCHARGE PIPE CONTROL
F6 HIGH PRESSURE CONTROL (IN COOLING)
H0 SENSOR FAULT
H6 OPERATION HALT DUE TO FAULTY POSITION DETECTION SENSOR
H8 DC CURRENT SENSOR FAULT
H9 FAULTY SUCTION AIR TEMPERATURE SENSOR
J3 FAULTY DISCHARGE PIPE TEMPERATURE SENSOR
J6 FAULTY HEAT EXCHANGER TEMPERATURE SENSOR
L3 ELECTRICAL PARTS HEAT FAULT
L4 HIGH TEMPERATURE AT INVERTER CIRCUIT HEATSINK
L5 OUTPUT OVERCURRENT
P4 FAULTY INVERTER CIRCUIT HEATSINK TEMPERATURE SENSOR

PenAir: Daikin Air Conditioning Specialists

While a reset can fix minor issues, more complex problems with your Daikin air conditioner might require expert attention. If your Daikin AC is not turning on after a reset, or you’re encountering repeated error codes, it’s time to call in the professionals.
At PenAir, we specialise in Daikin air conditioning systems. Our team of skilled technicians is equipped to handle everything from tricky troubleshooting to new installations and regular maintenance and repairs.
For any air conditioning issues in Sydney, contact PenAir for reliable and expert service. Our commitment to excellence and customer satisfaction ensures your needs are met with the highest level of professionalism and care.

We offer installation and maintenance services for air conditioning in Northern Beaches, Inner West, and Eastern suburbs including Bondi, Randwick, Vaucluse, and more. Find your suburb in our full list of Sydney service areas.

FAQs

Where is the reset button on a Daikin?

The reset function for a Daikin air conditioner is typically activated through the remote control. Instead of a separate reset button, the On/Off button acts as the Daikin Air Conditioner reset button.

How do I manually reset my AC unit?

To manually reset your Daikin AC unit, press and hold the On/Off button (Daikin AC reset button) on the remote for two seconds, then release it and press it twice more. This sequence acts as a reset for the unit.

How do you reset a Daikin fault?

To reset a Daikin fault, you’ll need to enter the diagnostic mode using the remote control to retrieve the fault code. Then, use the On/Off button to reset the unit. If the fault persists, professional assistance may be required.

Why is my Daikin air conditioner not starting?

If you experience issues like your Daikin AC not turning on, check for any power supply issues first. If the power supply is fine, try resetting the unit using the remote control. Persistent starting issues might indicate a more serious problem needing professional attention.

Free, No Obligation Consultation.

Get a Quote

Schedule a time with us to organise a quote for your home or business.

One of our technicians will perform an inspection and provide you with an obligation free quote.