ErrorCodeDoctor
Daikin Air Conditioner PJ error code
The PJ error means your Daikin air conditioner detected a mismatch between the inverter PCB and the fan driver. This typically occurs after an outdoor unit main PCB was replaced without performing the required field settings. Contact a qualified technician to correct the PCB type settings.
Common causes
- Mis-matching of PCB type
- Improper or missing field setting after replacing the outdoor unit main PCB
How to fix it
-
1
Contact a qualified technician to perform the required field settings after PCB replacement
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
PJ error — frequently asked questions
What does the PJ error mean on a Daikin air conditioner?
An improper combination of inverter and fan driver was detected
What causes the PJ error?
The PJ error is usually caused by: Mis-matching of PCB type; Improper or missing field setting after replacing the outdoor unit main PCB.
Can I fix the PJ 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 PJ error?
Fixing the PJ error on a Daikin air conditioner typically costs $80–$300, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the PJ error?
We'd recommend addressing the PJ error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.