ErrorCodeDoctor
Daikin Air Conditioner P4 error code
The P4 error means your Daikin air conditioner detected a fault with the radiation fin temperature sensor on the inverter PCB. Contact a qualified technician to inspect the sensor and inverter components.
Common causes
- Defective radiation fin temperature thermistor
- Defective inverter PCB
- Defective inverter compressor
- Defective fan motor
How to fix it
-
1
Contact a qualified technician to inspect the radiation fin temperature sensor and inverter 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
P4 error — frequently asked questions
What does the P4 error mean on a Daikin air conditioner?
The radiation fin temperature sensor has a fault
What causes the P4 error?
The P4 error is usually caused by: Defective radiation fin temperature thermistor; Defective inverter PCB; Defective inverter compressor; Defective fan motor.
Can I fix the P4 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 P4 error?
Fixing the P4 error on a Daikin air conditioner typically costs $80–$350, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the P4 error?
We'd recommend addressing the P4 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.