ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner UJ error code

Difficulty: Hard · Cost: $80–$300 · Duration: Requires professional service

The UJ error means your Daikin air conditioner detected a transmission fault with an accessory device connected to the system. This can be caused by a defect in the accessory device itself or faulty wiring to it. Contact a qualified technician to inspect the accessory device and its wiring.

Common causes

  • Defect of an accessory device connected to the system
  • Faulty wiring to the accessory device

How to fix it

  1. 1

    Contact a qualified technician to inspect the accessory device and its wiring connections

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