ErrorCodeDoctor
Daikin Air Conditioner CA error code
The CA error means your Daikin air conditioner detected a fault with the discharge air thermistor — the sensor that measures the temperature of the air being discharged from the indoor unit. Contact a qualified technician to test and replace the thermistor.
Common causes
- Defective thermistor for discharge air
- Defective indoor unit PCB
- Defective connector contact
How to fix it
-
1
Contact a qualified technician to inspect and replace the discharge air 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
CA error — frequently asked questions
What does the CA error mean on a Daikin air conditioner?
The indoor unit discharge air thermistor has a fault
What causes the CA error?
The CA error is usually caused by: Defective thermistor for discharge air; Defective indoor unit PCB; Defective connector contact.
Can I fix the CA 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 CA error?
Fixing the CA 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 CA error?
We'd recommend addressing the CA error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.