What causes Daikin error A1?

Defective indoor unit control board. Electrical surge affecting the PCB

How do you fix Daikin fault code A1?

1. Turn off the power to the unit at the circuit breaker. 2. Wait for 5 minutes before restoring power to see if the error resets. 3. If the error persists, the indoor unit's PCB may require replacement by a technician.

A1

A1 — Indoor unit PCB defect detected

Daikin · Air Conditioner

What does A1 mean?

This indicates a fault with the main circuit board inside the indoor unit. This part controls the unit's functions.

Common Causes

Defective indoor unit control board
Electrical surge affecting the PCB

Repair Steps & Checklist

Click steps to track your progress.

1
Turn off the power to the unit at the circuit breaker.
2
Wait for 5 minutes before restoring power to see if the error resets.
3
If the error persists, the indoor unit's PCB may require replacement by a technician.

Browse all codes in this manual (40)

Verified technical data. Last updated: April 2026

Source: Daikin Air Conditioner

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A1 — Indoor unit PCB defect detected

A1 — Indoor unit PCB defect detected

What does A1 mean?

Common Causes

Repair Steps & Checklist

Related Faults