ErrorKhoj

Haier Air Conditioner

Haier AC E4 error

Memory (EEPROM) error — indoor unit board

Needs a technicianFrom brand’s official support

Try a reset once. If it comes back, a trained technician should repair it.

What it means

The indoor unit board cannot read its saved settings from its memory chip (EEPROM). This is an electronic fault on the board.

Common causes

  • Power surge or lightning
  • Data corrupted after a power cut
  • Faulty memory chip or control board

Try this at home first

Tick each step as you go

When to call a technician

If the code stays, the control board must be repaired or replaced by an authorised technician.

Safety first

Always switch off at the wall socket or MCB before touching any part. Do not open the outdoor unit, control boards or gas pipes yourself — they carry high voltage and pressure.

Frequently asked questions

What does E4 mean on a Haier Air Conditioner?

Memory (EEPROM) error — indoor unit board. The indoor unit board cannot read its saved settings from its memory chip (EEPROM). This is an electronic fault on the board.

Can I fix Haier Air Conditioner error E4 myself?

You can try a reset first: Switch off at the MCB for 10 minutes and restart once. If the code returns, call a technician.

Is it safe to keep using the Air Conditioner with E4?

Avoid repeated restarts; running with this fault can cause more damage.

Other Haier AC codes

E1 Indoor room temperature sensor fault E2 Indoor coil (evaporator) temperature sensor fault E5 Indoor coil anti-freeze protection E7 Communication error (indoor ↔ outdoor unit) E9 High pressure / overload protection E14 Indoor fan motor fault F1 Inverter board / power module protection F2 Overcurrent / compressor overload

All Haier Air Conditioner error codes

Same code on other brands

E4 Compressor overheating / High pressure / overload protection / Indoor room temperature sensor faultVoltas AC E4 High pressure / overload protection / Compressor overheating / Indoor fan motor fault / Drain / water overflow protectionBlue Star AC E4 Outdoor air temperature sensor faultLloyd AC E4 Compressor overheatingGree AC FE Too much water (overflow)LG Washing Machine E-02 Cooking time set too longSamsung Microwave E4 Door / lid not closed or not locking / Too much water (overflow)IFB Washing Machine E4 Unbalanced load / Door / lid not closed or not lockingGodrej Washing Machine E01 Control board (PCB) faultBosch Dishwasher

Sources

We write every explanation in our own words from these references.

Last checked: 2026-10-20