Kenmore Refrigerator Er dF Error — Defrost Temperature Sensor Problem
The Er dF error code indicates a fault with the defrost sensor, which monitors evaporator coil temperature during defrost cycles. This sensor tells the control board when the evaporator has warmed sufficiently to melt frost accumulation, allowing the system to end the defrost cycle and resume cooling.
Consequences of a Failed Defrost Sensor
A failed defrost sensor in the open state causes excessive frost buildup on the evaporator coils — eventually blocking airflow and leading to warm temperatures in both compartments despite the compressor running normally. This is one of the most common causes of Kenmore refrigerator cooling issues.
Manual Defrost Test
If the freezer has a thick wall of ice visible behind the back panel, manually defrost the refrigerator by unplugging it for 24 hours with the doors open and towels on the floor. If temperatures normalize after manual defrost, the defrost sensor (or defrost heater) is the likely culprit.
Complete Defrost System Check
Our technicians test the defrost sensor, defrost heater, and defrost timer/control together since all three work in concert. Replacing only the sensor when the heater has also failed leads to repeat service calls.