ErrorCodeDoctor
Daikin Air Conditioner F3 error code
The F3 error means your Daikin air conditioner detected an abnormal temperature in the compressor discharge pipe — the pipe that carries high-temperature, high-pressure refrigerant from the compressor. This can indicate a refrigerant shortage, a blocked system, or a defective thermistor. Contact a qualified technician.
Common causes
- Discharge pipe thermistor is defective
- Discharge pipe temperature is genuinely abnormal due to refrigerant shortage or blockage
- Outdoor unit control PCB has a fault
How to fix it
-
1
Contact a qualified technician to inspect the discharge pipe thermistor and refrigerant system
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
F3 error — frequently asked questions
What does the F3 error mean on a Daikin air conditioner?
An abnormal discharge pipe temperature was detected
What causes the F3 error?
The F3 error is usually caused by: Discharge pipe thermistor is defective; Discharge pipe temperature is genuinely abnormal due to refrigerant shortage or blockage; Outdoor unit control PCB has a fault.
Can I fix the F3 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 F3 error?
Fixing the F3 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 F3 error?
We'd recommend addressing the F3 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.