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F31

Malfunction of gas pipe temp. sensor for indoor unit C

Haier · Air Conditioning

What does F31 mean?

The temperature sensor for the gas pipe of indoor unit C has malfunctioned. This sensor monitors refrigerant temperature.

Common Causes

  • Gas pipe temperature sensor malfunction for indoor unit C

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Inspect the gas pipe temperature sensor for indoor unit C.

  2. 2

    Check its wiring and connection.

  3. 3

    Refer to service guides for sensor testing.

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

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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 58)Search more codes in this manual