ErrorCodeDoctor
Daikin Air Conditioner JA error code
The JA error means your Daikin air conditioner detected a fault with the high pressure sensor. Note that this can sometimes be caused by the low pressure sensor being accidentally connected in place of the high pressure sensor. Contact a qualified technician to inspect and replace the sensor.
Common causes
- Defective connector contact
- Low pressure sensor connected in place of high pressure sensor by mistake
- Defective high pressure sensor
- Defective outdoor unit PCB
How to fix it
-
1
Contact a qualified technician to inspect the high and low pressure sensor connections and replace if needed
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
JA error — frequently asked questions
What does the JA error mean on a Daikin air conditioner?
The high pressure sensor has a fault
What causes the JA error?
The JA error is usually caused by: Defective connector contact; Low pressure sensor connected in place of high pressure sensor by mistake; Defective high pressure sensor; Defective outdoor unit PCB.
Can I fix the JA 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 JA error?
Fixing the JA 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 JA error?
We'd recommend addressing the JA error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.