The Defrost Thermostat is an OEM part for GE refrigerators. It regulates the temperature of the defrost cycle by sensing the temperature of the evaporator coils and signaling the defrost heater to turn on or off. This helps prevent ice buildup on the coils, ensuring efficient cooling and proper refrigerator operation. You should replace this defrost thermostat if it fails to regulate the defrost cycle correctly. Common causes of a bad thermostat include electrical failures, wear and tear from regular use, or damage from temperature fluctuations. Symptoms of a bad defrost thermostat include: Excessive frost buildup in the freezer Refrigerator not maintaining the correct temperature Defrost cycle not activating Water leaking inside the refrigerator This GE replacement part is also compatible with Hotpoint, RCA, and some Kenmore models.This part fixes the following symptomsFridge too warmFridge runs too longFreezer not defrostingFreezer section too warmWR50X122 (AP2071262) replaces 2387, AH303471, EA303471, PS303471, WR50X0122, WR50X0128, WR50X10014, WR50X128.