ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner UA error code

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

The UA error means your Daikin air conditioner detected a mismatch between the indoor and outdoor units. This can be caused by connecting units of incompatible models, an incorrect power supply, a wrong PCB, or the outdoor unit PCB settings not being completed after a PCB replacement. Contact a qualified technician to verify the unit combination and settings.

Common causes

  • Excess of connected indoor units beyond the outdoor unit's capacity
  • Defective outdoor unit PCB
  • Mismatch of the refrigerant type between indoor and outdoor units
  • Outdoor unit PCB field settings were not carried out after replacement

How to fix it

  1. 1

    Contact a qualified technician to verify the unit combination compatibility and PCB field settings

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