The Defrost Thermostat Kit is an OEM replacement part for Frigidaire refrigerators. This kit contains the defrost thermostat, which is a crucial component in the refrigerator's defrost system. Symptoms of needing to replace the defrost thermostat kit include: Excessive frost or ice buildup on the evaporator coils Inadequate cooling or temperature fluctuations Increased energy consumption due to inefficient defrosting Condensation or moisture buildup within the refrigerator compartment Causes of a faulty defrost thermostat can include normal wear and tear, exposure to extreme temperatures or moisture, or electrical malfunctions. This OEM replacement is also compatible with Electrolux, Gibson, Kelvinator, and Kenmore refrigerator models.This part fixes the following symptomsFreezer not defrostingToo warmFridge too warmFreezer section too warmFreezer too coldFridge too cold5303918214 (AP2150145) replaces 75303918214, 892545, AH469522, EA469522, PS469522.