ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner A9 error code

Difficulty: Hard · Cost: $150–$400 · Duration: Requires professional service

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. 1

    Contact a qualified technician to inspect the electronic expansion valve

Related Daikin Air Conditioner error codes

1

A0

An external protection device connected to the indoor unit has been activated

hard
2

A1

A fault was detected in the indoor unit PCB (control board)

hard
3

A3

The drain level control system has detected an abnormality — drain may be clogged

medium
4

A5

Freeze-up protection (cooling) or high pressure control (heating) has activated — check the air filter

easy