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F12

F12 (1 flash) — EEPROM failure

Haier · Air Conditioning

What does F12 mean?

This error indicates a problem with the EEPROM (Electrically Erasable Programmable Read-Only Memory) on the outdoor unit. This memory stores important configuration data.

Common Causes

  • Faulty EEPROM data
  • Damaged EEPROM chip
  • Faulty Outdoor PCB

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the power to the unit for at least 1 minute, then power it back on.

  2. 2

    If the error persists, the Outdoor PCB likely needs to be replaced by a technician.

Browse all codes in this manual (103)
Verified technical data. Last updated: April 2026

Related Faults

1Error Code 1 — Outdoor PCB EEPROM fault10Error Code 10 — Defrost sensor fault11Error Code 11 — Compressor suction temperature sensor fault
Source: Haier Air Conditioning
Open Manual (Page 31)Search more codes in this manual