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Daikin Air Conditioner A1 Error Code

Indoor unit control board fault on Daikin air conditioners.

DaikinAll Daikin air conditioner codes

A1
May need a pro

The indoor unit's circuit board failed its self-check. The board may truly be dead, or electrical noise from a power surge or nearby equipment may have upset it.

Compatible models

Daikin split, SkyAir, VRV and packaged systems; Star Supply's Daikin code chart marks it for all four.

Also shown as

No other codes are listed for this fault.

Difficulty

Try the basic checks, but the usual fix is a technician's job.

Not sure you are reading the code right? See how to read Daikin air conditioner codes.

Safety first: unplug the air conditioner (or switch off its breaker) before touching filters, hoses or panels. If you smell burning or gas, or see water near the outlet, stop and call a professional.

How to fix Daikin A1

  1. Reset at the breaker

    A surge-related A1 often clears after a full power reset.

  2. Watch for a repeat

    If the unit runs normally afterward, note the date. A1 that keeps coming back points to the board itself.

When to call a technician

If A1 returns, the indoor control board likely needs replacing. That work involves live electrical parts and belongs with an HVAC technician.

Parts linked to A1

These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.

Order parts by your full model number so they fit.

Frequently asked questions

Which Daikin models show the A1 code?

Daikin split, SkyAir, VRV and packaged systems; Star Supply's Daikin code chart marks it for all four.

Can I fix Daikin A1 myself?

Only the basic checks. You can safely try the steps above, but A1 usually points to a part or fault that needs a technician.

Other Daikin air conditioner codes

Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.

Sources we checked