F1
LG
Freezer Temperature Sensor Out of Range
Freezer shows F1; internal temperature may be too warm or fluctuate.
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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
Aging or drifted freezer thermistor, Poor thermistor contact with liner or evaporator, Damaged sensor harness, Moisture intrusion in sensor housing
How to Fix / Troubleshooting
Safety: Unplug the freezer before working inside.
F1 is another designation for a freezer sensor fault on some LG models.
- Locate freezer thermistor: Find the sensor on the freezer wall or near the evaporator cover.
- Inspect mounting: Ensure the sensor is properly clipped or seated in its holder and not hanging loose.
- Check wiring: Look for cracks, cuts, or brittle insulation. Reseat the connector at both the sensor and main PCB if accessible.
- Replace sensor: If the sensor appears aged or tests out of spec with a multimeter, replace it with an LG-compatible part.
Persistent F1 after sensor replacement suggests a control board issue that should be professionally evaluated.
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Repair Difficulty
Medium
3/5
Required Part
Freezer Temperature Sensor (Thermistor)
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