ErrorCodeDoctor
Daikin Air Conditioner AA error code
The AA error means the indoor unit's heater overheated and the 26WH safety device was activated. This applies to models with an auxiliary heater. Contact a qualified technician to inspect the heater and safety device.
Common causes
- Heater overheated triggering the 26WH safety device
How to fix it
-
1
Contact a qualified technician to inspect the heater and 26WH safety device
Related Daikin Air Conditioner error codes
A0
An external protection device connected to the indoor unit has been activated
A1
A fault was detected in the indoor unit PCB (control board)
A3
The drain level control system has detected an abnormality — drain may be clogged
A5
Freeze-up protection (cooling) or high pressure control (heating) has activated — check the air filter
AA error — frequently asked questions
What does the AA error mean on a Daikin air conditioner?
The indoor unit heater overheated — safety device activated
What causes the AA error?
The AA error is usually caused by: Heater overheated triggering the 26WH safety device.
Can I fix the AA error myself?
This is rated a hard fix — it often requires tools, parts, or experience, and may be safer left to a professional technician.
How much does it cost to fix the AA error?
Fixing the AA error on a Daikin air conditioner typically costs $80–$250, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the AA error?
We'd recommend addressing the AA error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.