Frigidaire Refrigerator Error Code F-SENSOR

F-SENSOR indicates a freezer compartment temperature sensor error. The main PCB has detected that the sensor circuit voltage is outside the normal range of 1.0V to 4.5V, which points to an open circuit, a short circuit, a connector problem, or a temperature reading beyond the valid range of -58°F to 122°F. The refrigerator triggers this code to alert you that it cannot reliably monitor or control freezer temperatures.

Continued use carries risk because the refrigerator may not be maintaining a safe freezer temperature without a functioning sensor. Food safety guidelines recommend keeping freezers at or below 0°F, and the control board cannot reliably regulate cooling without valid sensor input. Check your frozen food for signs of thawing and use a standalone thermometer to monitor the compartment temperature while you diagnose the fault.

A reset may temporarily clear the code, but it will return if the underlying fault is still present. The main PCB will re-evaluate the sensor circuit voltage on the next power-up cycle and repost the error if the reading remains outside the 1.0V to 4.5V window. A reset is useful for confirming whether the fault is intermittent, but it is not a substitute for diagnosing and correcting the root cause.

Many of the causes behind F-SENSOR are DIY-accessible. Start by checking the sensor connector at the main PCB for looseness or corrosion and reseat it. If the connector is secure, use a multimeter to measure voltage at the PCB sensor connector: a reading between 1.0V and 4.5V suggests the circuit is intact, while a reading near 0V or 5V points to a shorted or open sensor or wiring. Replacing the thermistor or repairing damaged wiring are tasks most experienced DIYers can handle, but PCB replacement typically benefits from professional help.

Repair costs depend on what component has failed. A replacement freezer thermistor is generally an inexpensive part, typically in the range of $10 to $40. If the wiring harness needs repair or replacement, parts and labor can run $50 to $150. A main PCB replacement is the most expensive scenario, often falling in the $100 to $300 range for the part alone, plus labor if a technician is involved.