ErrorCodeDoctor
Daikin Air Conditioner A1 error code
The A1 error means your Daikin air conditioner detected a fault with the indoor unit's main PCB (printed circuit board). This can also be caused by external electrical noise. Contact a qualified technician to inspect and replace the indoor unit PCB if required.
Common causes
- Indoor unit PCB has malfunctioned or failed
- External electrical noise or interference affecting the PCB
How to fix it
-
1
Contact a qualified technician to inspect and replace the indoor unit PCB if required
Related Daikin Air Conditioner error codes
A0
An external protection device connected to the indoor unit has been activated
A3
The drain level control system has detected an abnormality — drain may be clogged
A5
Freeze-up protection (cooling) or high pressure control (heating) has activated — check the air filter
A6
The indoor unit fan motor has a fault
A1 error — frequently asked questions
What does the A1 error mean on a Daikin air conditioner?
A fault was detected in the indoor unit PCB (control board)
What causes the A1 error?
The A1 error is usually caused by: Indoor unit PCB has malfunctioned or failed; External electrical noise or interference affecting the PCB.
Can I fix the A1 error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the A1 error?
Fixing the A1 error on a Daikin air conditioner typically costs $150–$400, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the A1 error?
We'd recommend addressing the A1 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.