ErrorCodeDoctor
Daikin Air Conditioner E1 error code
The E1 error means your Daikin air conditioner detected a fault with the outdoor unit's main PCB. This can also be caused by defective connection of the indoor-outdoor relay wires. Contact a qualified technician to inspect the outdoor unit PCB and relay wiring.
Common causes
- Outdoor unit PCB has malfunctioned or failed
- Indoor-outdoor relay wires have a defective connection
How to fix it
-
1
Contact a qualified technician to inspect the outdoor unit PCB and wiring connections
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
E1 error — frequently asked questions
What does the E1 error mean on a Daikin air conditioner?
The outdoor unit PCB (control board) has a fault
What causes the E1 error?
The E1 error is usually caused by: Outdoor unit PCB has malfunctioned or failed; Indoor-outdoor relay wires have a defective connection.
Can I fix the E1 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 E1 error?
Fixing the E1 error on a Daikin air conditioner typically costs $150–$500, depending on parts and whether you do it yourself or hire a technician.
Is it safe to keep using my air conditioner with the E1 error?
We'd recommend addressing the E1 error before continuing to use the air conditioner, since hard-rated issues often involve a real fault rather than a minor glitch.