Kenmore Refrigerator Error Code dS

The dS error code on a Kenmore refrigerator indicates that the control board has detected a short circuit or open circuit condition in the defrost sensor circuit. The defrost sensor, also called the defrost thermistor, is a temperature-sensing component mounted near the evaporator coil. Its primary function is to monitor evaporator temperature during the defrost cycle and signal the control board to terminate defrost heating once a safe temperature threshold is reached. When the sensor's resistance reading falls outside the expected range, either due to a shorted circuit reading near zero ohms or an open circuit reading of infinite resistance, the board flags the dS fault.

The diagnostic procedure begins at the cover PCB, where the technician should inspect CON6, the connector associated with the defrost sensor wiring harness. Loose, corroded, or damaged terminals at CON6 are a frequent source of this fault because moisture in the freezer compartment can cause connector pins to oxidize over time, increasing resistance at the contact points and triggering a false open-circuit reading. Before condemning the sensor itself, verifying connector integrity at CON6 is the essential first step.

If the connection at CON6 is secure and undamaged, the defrost sensor itself is the next suspect. A failed thermistor will exhibit either a direct short between its leads or a complete break in the sensing element, both of which produce readings outside the control board's acceptable window. Wiring harness damage along the run between the sensor and CON6, such as pinched or chafed insulation, can also produce the same fault signature. Persistent dS codes with a functioning defrost sensor typically point to a control board input circuit failure.