ErrorCodeDoctor
Daikin Air Conditioner E9 error code
The E9 error means your Daikin air conditioner detected a fault with the outdoor unit electronic expansion valve — the component that controls refrigerant flow through the outdoor unit. Contact a qualified technician to inspect the expansion valve and outdoor unit PCB.
Common causes
- Electronic expansion valve coil connector is disconnected
- Expansion valve coil is defective
- Outdoor unit control PCB has a fault
How to fix it
-
1
Contact a qualified technician to inspect the outdoor unit expansion valve and PCB
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
E9 error — frequently asked questions
What does the E9 error mean on a Daikin air conditioner?
The outdoor unit electronic expansion valve coil has a fault
What causes the E9 error?
The E9 error is usually caused by: Electronic expansion valve coil connector is disconnected; Expansion valve coil is defective; Outdoor unit control PCB has a fault.
Can I fix the E9 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 E9 error?
Fixing the E9 error on a Daikin air conditioner typically costs $150–$450, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the E9 error?
We'd recommend addressing the E9 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.