LG Refrigerator Error Code F-SENSOR ERROR

The F-SENSOR ERROR indicates a fault in the freezer compartment temperature sensor circuit. The main PCB has detected a sensor reading above 122°F (+50°C) or below -122°F (-50°C), which is outside the valid operating range. The fault can be caused by a loose sensor, a wiring problem, a bad connector, or a failed sensor. Voltage at the main PCB connector CN30 pins 2 and 3 should measure between 1.0V and 4.5V in a properly functioning circuit.

It is not advisable to continue using the refrigerator normally with this error active. Without a valid freezer temperature reading, the control board cannot regulate cooling accurately, which means freezer temperatures may drift and food safety could be compromised. Addressing the fault promptly is recommended.

A power reset may temporarily clear the error code, but if the underlying fault in the sensor, wiring, or connector has not been corrected, the error will return. The code is triggered by an active electrical condition in the sensor circuit, not a software glitch, so a reset alone is not a fix. Proper diagnosis starting with the voltage check at CN30 pins 2 and 3 is required to resolve the error permanently.

Some causes are DIY-friendly. If the sensor has simply slipped out of its mounting clip, reseating it may clear the error. Inspecting and reseating the CN30 connector on the main PCB is also straightforward. Replacing the freezer sensor itself is a moderate-level repair that most handy homeowners can complete. Wiring harness repairs or main PCB replacement are better handled by a technician.

If the repair is just reseating a loose sensor or connector, there may be no parts cost at all. A replacement freezer temperature sensor typically costs in the range of $15 to $50 for the part. If a wiring harness or the main PCB needs replacement, total repair costs including labor can range from $150 to $400 or more depending on your region and service provider.