ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner H4 error code

Difficulty: Hard · Cost: $80–$250 · Duration: Requires professional service

The H4 error means your Daikin air conditioner detected a fault with the low pressure switch itself. Contact a qualified technician to inspect and replace the low pressure switch.

Common causes

  • Defective low pressure switch
  • Broken wire to the low pressure switch
  • Defective outdoor unit PCB
  • Defective connector contact

How to fix it

  1. 1

    Contact a qualified technician to inspect and replace the low pressure switch

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