ErrorCodeDoctor
Daikin Air Conditioner A9 error code
The A9 error means your Daikin air conditioner detected a fault with the indoor unit's electronic expansion valve — the component that controls refrigerant flow into the indoor coil. Contact a qualified technician to inspect and replace the expansion valve coil or PCB.
Common causes
- Electronic expansion valve coil is defective
- Indoor unit PCB has malfunctioned
- Relay cables to the expansion valve are defective
How to fix it
-
1
Contact a qualified technician to inspect the electronic expansion valve
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
A9 error — frequently asked questions
What does the A9 error mean on a Daikin air conditioner?
The indoor unit electronic expansion valve has a fault
What causes the A9 error?
The A9 error is usually caused by: Electronic expansion valve coil is defective; Indoor unit PCB has malfunctioned; Relay cables to the expansion valve are defective.
Can I fix the A9 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 A9 error?
Fixing the A9 error on a Daikin air conditioner typically costs $150–$400, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the A9 error?
We'd recommend addressing the A9 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.