Daikin Air Conditioner
Daikin AC A1 error
Control board (PCB) fault
Try a reset once. If it comes back, a trained technician should repair it.
What it means
The control board has detected a fault in its own electronics or settings.
Common causes
- Power surge or unstable voltage
- Moisture or insects on the board
- Failed part or wrong setting on the board
Try this at home first
Tick each step as you go
When to call a technician
If the fault repeats, a technician must check or replace the board.
Safety first
Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.
Frequently asked questions
What does A1 mean on a Daikin Air Conditioner?
Control board (PCB) fault. The control board has detected a fault in its own electronics or settings.
Can I fix Daikin Air Conditioner error A1 myself?
You can try a reset first: Switch off at the MCB for 10 minutes and restart. If the code returns, call a technician.
Is it safe to keep using the Air Conditioner with A1?
Avoid repeated restarts; running with this fault can cause more damage.
Other Daikin AC codes
Sources
We write every explanation in our own words from these references.
Last checked: 2026-10-20