ErrorCodeDoctor
Daikin Air Conditioner M8 error code
The M8 error means your Daikin air conditioner system detected a transmission fault between optional controllers for centralized control. This can be caused by a power disconnection of another centralized control unit, the reset switch being on, defective wiring, or a central remote controller address change. Contact a qualified technician.
Common causes
- Another centralized control unit lost power
- Centralized control reset switch is ON
- Defective transmission wiring
- Central remote controller address was changed
How to fix it
-
1
Contact a qualified technician to inspect the centralized control wiring and address settings
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
M8 error — frequently asked questions
What does the M8 error mean on a Daikin air conditioner?
A communication fault was detected between optional centralized controllers
What causes the M8 error?
The M8 error is usually caused by: Another centralized control unit lost power; Centralized control reset switch is ON; Defective transmission wiring; Central remote controller address was changed.
Can I fix the M8 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 M8 error?
Fixing the M8 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 M8 error?
We'd recommend addressing the M8 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.