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

E3 error — frequently asked questions

What does the E3 error mean on a Daikin air conditioner?

The high pressure switch was activated — outdoor coil may be dirty

What causes the E3 error?

The E3 error is usually caused by: 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.

Can I fix the E3 error myself?

It's possible for a moderately handy person, but budget 20–30m and expect some disassembly.

How much does it cost to fix the E3 error?

Fixing the E3 error on a Daikin air conditioner typically costs $0–$250, depending on parts and whether you do it yourself or hire a technician.

Is it safe to keep using my air conditioner with the E3 error?

In most cases yes, but it's best to address the E3 error soon — see the fix steps below to resolve it.