ErrorCodeDoctor
Daikin · Air Conditioner

Daikin Air Conditioner E3 error code

Difficulty: Medium · Cost: $0–$250 · Duration: 20–30m

The E3 error means your Daikin air conditioner's high pressure switch (HPS) was activated — the refrigerant pressure in the system exceeded safe limits and the unit shut down to protect the compressor. The most common cause is a dirty outdoor unit heat exchanger restricting heat dissipation. Clean the outdoor unit coil fins. If the error persists contact a qualified technician.

Common causes

  • Outdoor unit heat exchanger coil fins are dirty or blocked with debris reducing heat dissipation
  • Refrigerant piping is clogged
  • High pressure switch is defective
  • Thermistor connector contact is poor

How to fix it

  1. 1

    Turn off the air conditioner

  2. 2

    Clean the outdoor unit heat exchanger coil fins — use a soft brush or gently rinse with water to remove dust, leaves, and debris

  3. 3

    Make sure there is sufficient clearance around the outdoor unit for airflow

  4. 4

    Restart the air conditioner and check if E3 returns

  5. 5

    If E3 persists after cleaning the outdoor unit contact a qualified technician

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