ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner E4 error code

Difficulty: Hard · Cost: $150–$500 · Duration: Requires professional service

The E4 error means your Daikin air conditioner's low pressure switch (LPS) was activated — the refrigerant pressure dropped abnormally low. This is most commonly caused by a refrigerant leak or shortage. This requires a qualified technician — refrigerant handling requires certification and specialised equipment.

Common causes

  • Refrigerant has leaked and the system is low on refrigerant
  • Low pressure sensor is defective
  • Outdoor unit PCB has a fault

How to fix it

  1. 1

    Contact a qualified technician to inspect the system for refrigerant leaks and recharge if necessary

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