ErrorCodeDoctor
Daikin Air Conditioner U8 error code
The U8 error means your Daikin air conditioner detected a transmission fault between the main and sub remote controllers. This can be caused by a transmission error between the controllers, an incorrect connection between sub remote controllers, or a defective remote controller PCB. Contact a qualified technician.
Common causes
- Transmission error between main and sub remote controller
- Incorrect connection between sub remote controllers
- Defective remote controller PCB
How to fix it
-
1
Contact a qualified technician to inspect the remote controller wiring and PCBs
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
U8 error — frequently asked questions
What does the U8 error mean on a Daikin air conditioner?
A communication fault was detected between remote controllers
What causes the U8 error?
The U8 error is usually caused by: Transmission error between main and sub remote controller; Incorrect connection between sub remote controllers; Defective remote controller PCB.
Can I fix the U8 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 U8 error?
Fixing the U8 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 U8 error?
We'd recommend addressing the U8 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.