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E4

E4 — Indoor EEPROM failure

Haier · Air Conditioning

What does E4 mean?

This error means the Indoor unit's EEPROM, a type of memory chip, has failed or has corrupted data. This can prevent the unit from operating correctly.

Common Causes

  • Corrupted EEPROM data
  • Damaged EEPROM chip
  • Faulty PCB

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Unplug the air conditioner and wait for 1 minute before plugging it back in.

  2. 2

    Restart the unit.

  3. 3

    If the error reoccurs, the Indoor PCB will likely need to be replaced by a qualified 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