ErrorKhoj

Haier Air Conditioner

Haier AC F4 error

Compressor overheating

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 gas leaving the compressor is too hot, so the AC stops to protect the compressor.

Common causes

  • Low gas / leak
  • Dirty outdoor coil or poor air flow
  • Faulty sensor or expansion valve

Try this at home first

Tick each step as you go

When to call a technician

If it repeats, a technician should check gas pressure, the outdoor coil and the sensor.

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 F4 mean on a Haier Air Conditioner?

Compressor overheating. The gas leaving the compressor is too hot, so the AC stops to protect the compressor.

Can I fix Haier Air Conditioner error F4 myself?

You can try a reset first: Switch off and let it cool for 30 minutes. If the code returns, call a technician.

Is it safe to keep using the Air Conditioner with F4?

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

Other Haier AC codes

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 F3 Communication error (power module ↔ main board) F6 Outdoor air temperature sensor fault F7 Suction pipe temperature sensor fault F8 Outdoor fan motor fault F11 Compressor start / rotation fault F12 Memory (EEPROM) error — outdoor unit board F13 Low gas / refrigerant leak or blockage

All Haier Air Conditioner error codes

Same code on other brands

F4 Outdoor coil (condenser) temperature sensor fault / Communication error (power module ↔ main board)Blue Star AC F4 Outdoor coil (condenser) temperature sensor fault / Compressor discharge temperature sensor faultGree AC

Sources

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

Last checked: 2026-10-20