ErrorCodeDoctor
Daikin Air Conditioner H8 error code
The H8 error means your Daikin air conditioner detected a fault in the compressor input current transformer (CT) system — used to measure the electrical input to the compressor. This can be caused by a defective power transistor, a defective reactor, faulty inverter system wiring, or a defective outdoor unit PCB. Contact a qualified technician.
Common causes
- Defective power transistor
- Defective reactor
- Faulty wiring of the inverter system
- Defective outdoor unit PCB
How to fix it
-
1
Contact a qualified technician to inspect the CT system and inverter 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
H8 error — frequently asked questions
What does the H8 error mean on a Daikin air conditioner?
The compressor input current transformer (CT) system has a fault
What causes the H8 error?
The H8 error is usually caused by: Defective power transistor; Defective reactor; Faulty wiring of the inverter system; Defective outdoor unit PCB.
Can I fix the H8 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 H8 error?
Fixing the H8 error on a Daikin air conditioner typically costs $150–$450, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the H8 error?
We'd recommend addressing the H8 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.