The Defrost Heater Kit is an OEM part for Frigidaire refrigerators. This part is responsible for melting frost and ice buildup on the evaporator coils during the defrost cycle.   Causes of a bad defrost heater can include regular wear and tear, electrical issues, or physical damage.   Symptoms of a bad defrost heater include: Excessive frost or ice buildup in the freezer The refrigerator or freezer not cooling properly The defrost cycle not initiating Water leaking inside the refrigerator due to melting ice This OEM Frigidaire part is also compatible with Electrolux, Gibson, Kelvinator and some Kenmore models.5303918208 (AP2150139) replaces 833609, AH469516, EA469516, PS469516.