ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner U0 error code

Difficulty: Hard · Cost: $200–$600 · Duration: Requires professional service

The U0 error means your Daikin air conditioner detected a shortage of refrigerant in the system. This is caused by a refrigerant leak or incorrect piping. Refrigerant handling requires certification — contact a qualified technician to locate the leak, repair it, and recharge the system.

Common causes

  • Refrigerant has leaked from the system
  • Refrigerant piping is incorrectly installed
  • Defective thermistor giving a false low reading
  • Defective low pressure sensor

How to fix it

  1. 1

    Contact a qualified technician to inspect for refrigerant leaks, repair any found, and recharge the system to the correct level

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