ErrorCodeDoctor
Daikin Air Conditioner A8 error code
The A8 error means your Daikin air conditioner detected a power supply fault or overcurrent on the AC input to the indoor unit. This can be caused by a defective power supply voltage, a defective connection on the signal line, or incorrect wiring. Contact a qualified technician to inspect the power supply and wiring.
Common causes
- Defective power supply voltage
- Defective connection on signal line
- Defective wiring
How to fix it
-
1
Contact a qualified technician to inspect the indoor unit power supply and wiring
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
A8 error — frequently asked questions
What does the A8 error mean on a Daikin air conditioner?
A power supply fault or AC input overcurrent was detected at the indoor unit
What causes the A8 error?
The A8 error is usually caused by: Defective power supply voltage; Defective connection on signal line; Defective wiring.
Can I fix the A8 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 A8 error?
Fixing the A8 error on a Daikin air conditioner typically costs $80–$300, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the A8 error?
We'd recommend addressing the A8 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.