Samsung Refrigerator Error Code F-1 (F-Sensor Error)

The F-1 error means the main control board is detecting a signal from the freezer compartment temperature sensor that falls outside the expected range, specifically a reading above 149°F (+65°C) or below -58°F (-50°C). Because those temperatures are not physically realistic in a working freezer, the board interprets this as a sensor circuit fault rather than an actual temperature condition. The cause is typically a disconnected connector, broken wiring, or a failed thermistor. The refrigerator cannot properly regulate freezer temperature while this fault is active.

Running the refrigerator with an active F-1 error is a risk to food safety because the control board cannot accurately monitor or maintain freezer temperature without a functioning sensor. The compressor and fans may not cycle correctly, potentially allowing food to thaw or remain at unsafe temperatures. It is best to check freezer contents and transfer perishables to another freezer until the sensor fault is resolved.

A power reset may temporarily clear the F-1 error code from the display, but the code will return if the underlying sensor circuit fault has not been repaired. Resetting does not fix a failed thermistor, broken wire, or disconnected connector. Use the reset only as a way to confirm the repair was successful after the actual cause has been diagnosed and corrected.

A homeowner comfortable with basic electrical checks can start by inspecting and reseating all wiring connectors leading to the freezer temperature sensor. If you have a multimeter, checking the voltage at the main PCB connectors CN30 pin 3 and CN75 pin 1 for a reading between 1.0V and 4.5V will confirm whether the circuit is working. Replacing the freezer thermistor is a straightforward part swap in most Samsung models. Main PCB replacement is more involved and may benefit from a professional technician if other components have been ruled out.

If the fix is a simple connector reconnection, there is no parts cost involved. A replacement freezer thermistor typically costs in the range of $15 to $50 for the part alone, depending on the model. If the main PCB needs replacement, parts alone can run from $100 to $300 or more, with additional labor costs if a technician is hired. Getting a diagnosis before ordering parts helps avoid unnecessary expenses.