ErrorCodeDoctor
Daikin Air Conditioner J3 error code
The J3 error means your Daikin air conditioner detected a fault with the discharge pipe thermistor — the sensor that monitors the temperature of the high-pressure refrigerant leaving the compressor. Contact a qualified technician to test and replace the thermistor.
Common causes
- Discharge pipe thermistor connector is loose or disconnected
- Discharge pipe thermistor is defective
- Outdoor unit PCB has a fault
How to fix it
-
1
Contact a qualified technician to inspect and replace the discharge pipe 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
J3 error — frequently asked questions
What does the J3 error mean on a Daikin air conditioner?
The discharge pipe thermistor has a fault
What causes the J3 error?
The J3 error is usually caused by: Discharge pipe thermistor connector is loose or disconnected; Discharge pipe thermistor is defective; Outdoor unit PCB has a fault.
Can I fix the J3 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 J3 error?
Fixing the J3 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 J3 error?
We'd recommend addressing the J3 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.