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E4 / F12 (1 flash)

E4 (Indoor) or F12 (Outdoor, 1 flash) — EEPROM error

Haier · Air Conditioning

What does E4 / F12 (1 flash) mean?

This error signifies a problem with the EEPROM (Electrically Erasable Programmable Read-Only Memory) on either the indoor (E4) or outdoor (F12) unit. This memory stores vital operating data.

Common Causes

  • Corrupted EEPROM data
  • Damaged EEPROM chip
  • Faulty 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 relevant mainboard (Indoor or Outdoor PCB) 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 34)Search more codes in this manual