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F4

F4 (8 flashes) — Compressor discharging temperature protection

Haier · Air Conditioning

What does F4 mean?

The compressor's discharge temperature has exceeded a safe limit. This protection is in place to prevent damage to the compressor.

Common Causes

  • Faulty outdoor ambient sensor
  • Damaged Outdoor PCB
  • Low refrigerant

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure the outdoor unit is not exposed to direct, excessive heat.

  2. 2

    Check that air vents around the outdoor unit are clear.

  3. 3

    Restart the air conditioner.

  4. 4

    If the problem occurs shortly after startup or persists, consult 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