Samsung Refrigerator Error Code F-1 segment b

The F-1 segment b code indicates a failure in the freezer room temperature sensor on Samsung T/E/W model refrigerators. The main PCB monitors voltage from the sensor circuit at connector CN31 between pins 1 and 6, and triggers this code when that voltage falls outside the 0.5V to 4.5V operating range. The fault can stem from a defective sensor, damaged wiring, or a faulty connection at the board.

A faulty freezer temperature sensor means the refrigerator may not be maintaining proper freezer temperatures, since the control board cannot accurately regulate cooling cycles without reliable sensor data. If the freezer feels warm or is not freezing food properly, perishables may be at risk. Check the actual freezer temperature with a standalone thermometer and move food to a backup freezer if the compartment is above 0 degrees Fahrenheit.

Repair costs vary depending on the root cause. A replacement freezer temperature sensor typically costs between $15 and $50 for the part alone. If a technician is needed, labor charges can add $100 to $200 or more depending on your location and the service provider. In cases where the main PCB is at fault, part costs can range from $150 to $400 or higher, making professional diagnosis important before ordering components.

Some steps can be performed by a knowledgeable DIYer, such as inspecting the wiring harness, reseating the CN31 connector, and defrosting the freezer to clear any ice around the sensor. However, accurately diagnosing this code requires a multimeter to test voltage at the CN31 connector on the main PCB, which involves working near electrical components. If the sensor itself needs replacement, the repair is manageable for someone comfortable with appliance disassembly, but a technician is recommended if you are unsure.

A power reset may temporarily clear the error code from the display, but the code will return if the underlying sensor or wiring fault is still present. Resetting the unit is a useful first step to confirm whether the fault is intermittent, but it does not repair the failed component. A proper diagnosis of the voltage at CN31 and inspection of the sensor circuit is needed to resolve the error permanently.