LG Refrigerator Error Code F-sensor open/short

This error code indicates that the freezer room temperature sensor has an open or short circuit fault. The control board detected a sensor reading below -50°C or above +50°C, which falls outside any real operating condition and signals an electrical failure in the sensor or its wiring. The freezer may not maintain proper temperature while this fault is active, so the issue should be addressed promptly.

Continuing to run the refrigerator with an active F-sensor fault is not recommended for extended periods. Without accurate freezer temperature feedback, the compressor and cooling system may operate incorrectly, leading to food spoilage or potential overworking of components. Use the freezer only as a temporary measure while arranging the repair.

A reset, such as unplugging the refrigerator for a few minutes, may temporarily clear the fault code from the display. However, if the underlying sensor, wiring, or connector fault still exists, the error will return once the control board performs its next sensor check. A permanent fix requires diagnosing and repairing the actual electrical fault in the sensor circuit.

Many homeowners and DIYers can handle this repair with basic electrical knowledge and a multimeter. The process involves unplugging the refrigerator, locating the freezer temperature sensor, checking the connector and wiring for damage, and measuring sensor resistance to determine if the sensor or wiring is at fault. Replacing an NTC thermistor sensor is a straightforward part swap, but if the control board is involved, professional service is recommended.

If only the freezer temperature sensor needs replacement, parts typically range from $15 to $50 depending on the model, and the repair is relatively inexpensive. If a wiring harness repair or connector replacement is needed, costs remain in a similar range. A control board replacement is the most expensive scenario, with parts costs ranging from $100 to $300 or more, plus labor if a technician is hired.