The Defrost Heater is an OEM part for GE refrigerators. It plays a crucial role in the defrost system by heating the evaporator coil to melt any frost buildup. This ensures that the refrigerator operates efficiently by preventing ice accumulation that can obstruct airflow and cooling. Over time, defrost heaters can fail due to factors such as electrical issues, prolonged use, or thermal stress. When the defrost heater malfunctions, frost can accumulate excessively on the evaporator coils, leading to cooling problems. Symptoms of a bad defrost heater include: Frost buildup on the evaporator coils Inadequate cooling in the refrigerator or freezer compartments The refrigerator running continuously without cycling off Water leakage inside the refrigerator due to melting frost This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.This part fixes the following symptomsFreezer not defrostingFreezer section too warmWR51X442 (AP2071464) replaces 1972, 197D1481G001, AH303933, EA303933, PS303933, WR51X0342, WR51X0371, WR51X0442, WR51X0463, WR51X342, WR51X371, WR51X463.