LG Refrigerator Error Code F-SENSOR

F-SENSOR on an LG refrigerator indicates an error in the freezer compartment temperature sensor circuit. The code is triggered when the sensor reports a temperature that is not lower than 122°F or not higher than -58°F, values that fall outside any physically realistic operating range. This points to a circuit-level fault such as a cut wire, short circuit, loose connector, or a missing sensor housing rather than an actual temperature problem in the freezer.

It is not advisable to rely on the freezer while F-SENSOR is active. Without a valid temperature reading, the control board cannot regulate the freezer temperature accurately, which risks food safety. Check the freezer temperature with a separate thermometer if you need to assess whether food is still safe while you arrange for the repair.

A power reset may temporarily clear the F-SENSOR code, but it will return as soon as the control board checks the sensor circuit again and finds the reading out of range. The underlying fault, whether a failed sensor, damaged wire, or bad connector, must be corrected before the code clears permanently. Use a reset only as a way to confirm the fault is still present after making a repair, not as a standalone fix.

Some causes of F-SENSOR are DIY-friendly. Inspecting and reseating the connector at CN 30 on the main PCB and checking that the sensor is properly mounted in its housing require no special tools. If those steps do not resolve the code, diagnosing the wiring harness and testing sensor resistance requires a multimeter and comfort working inside the appliance. Replacing the main PCB is a more advanced repair and may benefit from professional service.

Repair costs vary depending on the root cause. A replacement freezer thermistor is generally an inexpensive part, typically in the range of $15 to $50, and the repair is straightforward if the wiring is intact. If the wiring harness needs replacement or the main PCB is at fault, parts and labor combined can range from $150 to $400 or more depending on the model and service rates in your area.