Kenmore Refrigerator Error Code FS

The FS error code on a Kenmore refrigerator indicates that the control system has detected either a short circuit or an open circuit in the freezer temperature sensor (thermistor). This sensor continuously reports freezer compartment temperature data to the main PCB, allowing the control board to regulate compressor cycles, defrost timing, and fan operation. When the sensor circuit falls outside the expected resistance range, the board flags the fault and displays the FS code. A short circuit typically means the sensor resistance has dropped too low, while an open circuit means the circuit has been broken entirely, producing no readable signal.

The freezer sensor connects to the main PCB through connector CON6. Because connector integrity is the first point of failure in this circuit, a loose or corroded connection at CON6 is the most likely cause before suspecting the sensor itself. Vibration, thermal cycling, and moisture intrusion can all loosen or degrade connector pins over time. Inspecting CON6 for bent pins, corrosion, or incomplete seating should be the first step in any diagnostic sequence.

If the CON6 connection is secure and undamaged, the fault most likely lies in the sensor wiring harness or the thermistor itself. The wiring between CON6 and the sensor location in the freezer compartment can develop breaks or shorts due to physical damage, pinching, or prolonged exposure to freezing temperatures. If wiring and connectors check out, replacing the freezer thermistor is typically the next corrective step. A failed main PCB is a less common but possible cause if the sensor and wiring test within specification.