F dS
LG
Freezer Defrost Sensor Error
Display shows F dS or FdS; freezer may overcool or undercool and defrost cycles may be abnormal.
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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
Open or shorted freezer defrost sensor, Sensor not in proper contact with evaporator, Damaged sensor harness, Corroded connector at PCB
How to Fix / Troubleshooting
Safety: Unplug the unit before removing panels.
F dS specifically flags the freezer defrost sensor.
- Access sensor: Remove the freezer rear panel to locate the defrost sensor clipped to the evaporator coil.
- Verify placement: Ensure the sensor is tightly clipped to the tubing and not displaced.
- Check wiring and connector: Inspect for damage and reseat the connector.
- Test and replace: Measure resistance at cold temperature; replace the sensor if readings are not within LG specifications.
Continued F dS after sensor replacement indicates a likely main PCB fault requiring professional service.
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Repair Difficulty
Hard
4/5
Required Part
Freezer Defrost Sensor
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