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F9

F9 (26 flashes) — Module reset

Haier · Air Conditioning

What does F9 mean?

This code indicates that the power module has undergone a reset. This could be due to a temporary power fluctuation or an internal module issue.

Common Causes

  • Power module reset triggered
  • Potential issue with Outdoor PCB or compressor

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

    Monitor the unit's operation after the reset.

  3. 3

    If this occurs repeatedly, contact a technician to diagnose the Power Module and related components.

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