F3
Liebherr Ambient / Room Temperature Sensor Fault

Freezer shows F3; temperature display may be inaccurate; unit may not maintain stable temperature.

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Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

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Possible Causes

Failed ambient NTC sensor on control board housing, Wiring damage in top panel, Faulty connection between sensor and main PCB

How to Fix / Troubleshooting

Safety first: Unplug the appliance before opening any covers.

Steps:

  • Locate ambient sensor: On many Liebherr freezers, the ambient sensor is integrated near the control panel or behind a small vent on the top/front fascia.
  • Clean vents: Dust and grease can insulate the sensor. Gently vacuum or brush the vent area to ensure proper airflow.
  • Inspect wiring: Remove the top control panel cover and check the small sensor harness for damage or loose plugs.
  • Test sensor: If accessible, unplug and measure resistance at room temperature. Compare to typical NTC values; an open or shorted sensor must be replaced.

Remedy: Replace the ambient temperature sensor or the small sensor harness as a unit if damaged. Ensure the sensor is positioned correctly behind its vent so it can sense room temperature accurately.

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Repair Difficulty

Medium 3/5

Required Part

Ambient Temperature NTC Sensor
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