Samsung Refrigerator Error Code F-SENSOR error (displayed on 7-segment)

The F-SENSOR error indicates that the freezer compartment temperature sensor has an OPEN or SHORT circuit fault. An OPEN fault occurs when the sensor reading drops below -50°C, while a SHORT fault occurs when it rises above +50°C. In both cases, the MICOM input voltage falls outside the valid 0.5V to 4.5V range, and the refrigerator flags the error. The freezer may stop cooling properly until the sensor or its wiring is repaired or replaced.

Continued use is not recommended without monitoring the freezer temperature independently. Because the control board cannot read a valid temperature signal, it may not regulate the compressor correctly, which could result in inadequate freezing or, in some cases, excessive cooling. Food safety may be at risk if the freezer temperature rises above safe levels during this fault condition.

A power reset may temporarily clear the error display, but the code will return if the underlying sensor or wiring fault has not been corrected. The MICOM monitors the sensor input continuously, so any reset is only a short-term measure. A permanent fix requires restoring the sensor voltage to within the 0.5V to 4.5V operating range by repairing or replacing the faulty component.

A knowledgeable DIYer can often resolve this error by inspecting and reseating the sensor harness connector or by replacing the freezer thermistor. The first diagnostic step is to check whether the MICOM input voltage is within 0.5V to 4.5V. If the voltage is out of range, the sensor or its wiring needs attention. If you are not comfortable working with appliance wiring, a qualified technician should perform the repair.

If only the freezer thermistor needs replacement, parts typically cost between $15 and $50, and the total repair with a technician can range from $80 to $200 depending on labor rates in your area. If the control board is found to be faulty, parts and labor costs can range from $200 to $400 or more. Diagnosing the root cause first avoids unnecessary parts replacement.