Daikin AC Error Code A1 — Indoor PCB Malfunction

What Does This Error Mean?

A1 on a Daikin AC indicates a malfunction of the indoor unit PCB (printed circuit board — the main control board inside the indoor unit). This board controls all indoor unit functions. A1 is a serious fault that typically requires PCB replacement by a Daikin authorised technician.

Affected Models

Daikin FTKF Series
Daikin FTKG Series
Daikin ATKF Series
Daikin Inverter Split AC (all models)
Daikin 1 Ton / 1.5 Ton / 2 Ton Inverter

Common Causes

Indoor PCB component failure — capacitor, relay, or control IC failure
Power surge or lightning strike damaging PCB components
Moisture or water ingress onto the indoor PCB
Overheating of the PCB due to prolonged fault conditions
Manufacturing defect on units within warranty period

How to Fix It

Switch off the AC at the remote and at the circuit breaker.

Wait 5 minutes and attempt one restart. A power cycle clears transient faults — if A1 was caused by a brief voltage spike, it may not return.
Do not keep restarting if A1 returns.

Repeated restarts on a faulty PCB can cause additional component damage.
Check the warranty status of your unit.

Daikin offers up to 5 years parts warranty in many markets. A PCB failure within warranty is typically covered at no cost — contact your installing dealer.
Book an authorised Daikin service visit and have the model and serial number ready.

The model and serial number are on the label inside the front panel. The technician may need to order a replacement PCB, so having these details ready can speed up the repair.

When to Call a Professional

A1 requires an authorised Daikin technician. PCB replacement is the most common resolution. Daikin authorised service agents have access to genuine Daikin PCBs and can also read the internal fault log to confirm the diagnosis.

Frequently Asked Questions

How much does a Daikin indoor PCB replacement cost?

A Daikin indoor PCB typically costs Rs 2,500–8,000 in India or $80–300 internationally, plus technician labour. For units within warranty, the part is covered. Always request a written quote and confirm the part is a genuine Daikin board.

Can a Daikin A1 error be caused by insects?

Yes — ants and other insects sometimes nest inside indoor units and can cause short circuits on the PCB by bridging solder tracks or components. If you notice ant activity around your indoor unit, this should be mentioned to the technician before they open the unit.