ErrorCodeDoctor
Daikin Air Conditioner F6 error code
The F6 error means your Daikin air conditioner detected abnormal high pressure, which may be caused by refrigerant overcharging or disconnected thermistor connectors. This requires a qualified technician as refrigerant handling requires certification and specialised equipment.
Common causes
- Refrigerant has been overcharged in the system
- Heat exchanger deicer thermistor connector is disconnected
- Outdoor air thermistor connector is disconnected
- Liquid pipe temperature thermistor connector is disconnected
- Outdoor unit PCB has a fault
How to fix it
-
1
Contact a qualified technician to inspect the refrigerant charge level and thermistor connections
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
F6 error — frequently asked questions
What does the F6 error mean on a Daikin air conditioner?
Abnormal high pressure detected — possible refrigerant overcharge
What causes the F6 error?
The F6 error is usually caused by: Refrigerant has been overcharged in the system; Heat exchanger deicer thermistor connector is disconnected; Outdoor air thermistor connector is disconnected; Liquid pipe temperature thermistor connector is disconnected; Outdoor unit PCB has a fault.
Can I fix the F6 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 F6 error?
Fixing the F6 error on a Daikin air conditioner typically costs $150–$500, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the F6 error?
We'd recommend addressing the F6 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.