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

The F-1 code indicates the freezer compartment temperature sensor is reporting a reading above 149°F (65°C) or below -58°F (-50°C), both of which are outside any realistic freezer operating range. The control board interprets this as a sensor part failure. The fault points to the freezer thermistor, its wiring harness, or in less common cases, the main PCB. Diagnosis starts with a voltage check at the main PCB connectors CN30 pin 3 and CN75 pin 1, which should read between 1.0V and 4.5V for a functioning circuit.

With the F-1 code active, the refrigerator's control board cannot accurately monitor freezer temperatures, which means it may not regulate cooling properly. Food safety could be compromised if the freezer is not maintaining the correct temperature. It is advisable to check that the freezer is still cold and address the fault promptly rather than continuing to use the appliance long-term with the error present.

If only the freezer thermistor needs replacement, parts typically range from $15 to $50 depending on the specific model, with labor costs adding $75 to $150 if a technician performs the repair. If the main PCB is the cause, board replacement can cost significantly more, often ranging from $150 to $400 or higher for parts alone. Getting a diagnostic assessment first helps avoid paying for unnecessary parts.

A knowledgeable DIYer can inspect the wiring harness and connector pins for visible damage, corrosion, or loose connections, which are common causes of this fault. If the wiring looks intact, testing the thermistor resistance and measuring the voltage at PCB connectors CN30 pin 3 and CN75 pin 1 requires a multimeter and basic electrical knowledge. Replacing the freezer thermistor is a straightforward repair if that component is confirmed faulty. Main PCB replacement is more complex and typically benefits from professional diagnosis.

A power cycle or control panel reset may temporarily clear the F-1 code, but if the underlying cause such as a failed thermistor or damaged wiring is still present, the code will return. Resetting alone does not repair the sensor or wiring fault. A proper diagnosis and repair of the faulty component is required to permanently clear the error.