What causes Daikin error A1?

Defect of the PCB.. Electrical noise interference.

How do you fix Daikin fault code A1?

1. Power off the air conditioner at the main breaker for 60 seconds. 2. Restore power and check if the error code clears. 3. If the error persists, the indoor PCB may need replacement by a qualified technician.

A1

A1 - Indoor PCB failure

Daikin · Air Conditioning

What does A1 mean?

There is a defect with the main circuit board inside the indoor unit.

Common Causes

Defect of the PCB.
Electrical noise interference.

Repair Steps & Checklist

Click steps to track your progress.

1
Power off the air conditioner at the main breaker for 60 seconds.
2
Restore power and check if the error code clears.
3
If the error persists, the indoor PCB may need replacement by a qualified technician.

Browse all codes in this manual (79)

Verified technical data. Last updated: April 2026

Source: Daikin Air Conditioning

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A1 - Indoor PCB failure

What does A1 mean?

Common Causes

A1 - Indoor PCB failure

What does A1 mean?

Common Causes

Repair Steps & Checklist

Related Faults