ErrorCodeDoctor
Daikin Air Conditioner HC error code
The HC error means your Daikin air conditioner detected a fault with the hot water temperature thermistor. This applies to heat pump systems connected to a hot water circuit. Contact a qualified technician to inspect and replace the thermistor.
Common causes
- Defective connection of the thermistor
- Defective outdoor unit PCB
- Defective water temperature thermistor
How to fix it
-
1
Contact a qualified technician to inspect and replace the hot water temperature thermistor
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
HC error — frequently asked questions
What does the HC error mean on a Daikin air conditioner?
The hot water temperature thermistor has a fault
What causes the HC error?
The HC error is usually caused by: Defective connection of the thermistor; Defective outdoor unit PCB; Defective water temperature thermistor.
Can I fix the HC 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 HC error?
Fixing the HC 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 HC error?
We'd recommend addressing the HC error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.