Kenmore Refrigerator Error Code Defrost Sensor

The Defrost Sensor error on a Kenmore refrigerator indicates that the control board has detected an abnormal signal from the defrost temperature sensor. This sensor is a thermistor mounted near the evaporator coil, and its job is to monitor temperature during the defrost cycle so the system knows when to terminate defrost and return to normal cooling. When the board reads a signal that falls outside the expected resistance range, either because the circuit is open (cut wire) or shorted, it logs this fault and may suspend defrost operation entirely.

The two primary electrical faults this code covers are an open circuit and a short circuit. An open circuit typically results from a broken or cut wire in the sensor harness, a failed sensor with an internally open thermistor element, or a disconnected connector. A short circuit occurs when two conductors in the harness make unintended contact, or when the sensor's thermistor element collapses internally. Both conditions cause the board to receive a signal it cannot interpret as a valid temperature reading.

The first diagnostic step involves removing the cover from the PCB and inspecting connector CON6, which is the designated plug point for the defrost sensor circuit. Loose, corroded, or partially seated pins at CON6 are a frequent source of intermittent or permanent faults. If CON6 is secure and shows no damage, the next step is to test the sensor's resistance directly and inspect the full length of the wiring harness between the sensor and the board for breaks, pinches, or heat damage near the evaporator housing.