Haier Air Conditioner
Haier AC F12 error
Memory (EEPROM) error — outdoor unit board
Try a reset once. If it comes back, a trained technician should repair it.
What it means
The outdoor 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 F12 mean on a Haier Air Conditioner?
Memory (EEPROM) error — outdoor unit board. The outdoor 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 F12 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 F12?
Avoid repeated restarts; running with this fault can cause more damage.
Other Haier AC codes
Sources
We write every explanation in our own words from these references.
- Haier India — Air conditioner error codes (self service)
- Haier Pakistan — Air conditioner error codes
Last checked: 2026-10-20