F2
LG Defrost Sensor / Heater Feedback Error

Freezer displays F2; may enter or remain in defrost unexpectedly, or show erratic defrost behavior.

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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

Defective defrost thermistor, Loose connection between defrost sensor and PCB, Shorted heater feedback circuit, Control board sensing fault

How to Fix / Troubleshooting

Safety: Disconnect power before accessing the evaporator area.

F2 indicates the control is not receiving proper feedback from the defrost system.

  • Access evaporator: Remove the freezer rear panel to expose the evaporator and defrost components.
  • Inspect defrost sensor: Verify the thermistor is firmly attached to the evaporator tubing and not dangling.
  • Check wiring: Follow the harness to the main PCB, looking for damage or loose connectors.
  • Test sensor: Measure resistance at cold temperature and compare to LG spec. Replace if out of range.
  • Inspect heater: Check for obvious damage or shorts to ground.

If F2 persists with good components, the main PCB may be defective and should be replaced by a technician.

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Repair Difficulty

Hard 4/5

Required Part

Defrost / Evaporator Thermistor
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