The Whirlpool WP12729123 Refrigerator Defrost Heater Assembly is a replacement heating component used to remove frost buildup from the evaporator during the defrost cycle. Installed near the evaporator coils inside the freezer compartment, it operates by generating controlled heat when the defrost system is activated, melting accumulated ice that can restrict airflow. This process hel... https://www.hnkparts.com/wp12729123-whirlpool-heater