Kenmore Refrigerator Error Code r dH

The r dH error code on a Kenmore refrigerator indicates a defrost cycle failure in the refrigerator compartment. Specifically, the control board triggers this code when 50 minutes have elapsed since the defrost cycle began and the defrost sensor has not detected a temperature rise above 40°F (5°C). Under normal operation, the defrost heater activates to melt frost accumulation off the evaporator coils, and the defrost sensor monitors the temperature climb to confirm the heater is working. When that threshold is not reached within the allotted time, the board logs the fault and displays r dH.

Four primary failure points can cause this condition. First, the thermal fuse (also called the temperature fuse) is a one-time safety device wired in series with the defrost heater circuit. If it has blown due to overheating, the heater circuit is open and no heat is produced. Second, the defrost heater element itself may have failed, resulting in the same open-circuit condition. Third, a jammed or frozen drain can cause ice buildup that interferes with proper defrost completion. Fourth, a faulty relay controlling the defrost heater may not be closing the circuit correctly, preventing power from reaching the heater even when the control board commands it.

Diagnosing this code requires accessing the evaporator panel, typically located behind the rear wall of the refrigerator compartment. A technician should check for continuity through the thermal fuse and the heater element using a multimeter. The drain should be inspected for ice blockage. The heater relay on the control board should also be evaluated for proper switching function.