The Defrost Thermostat is an OEM part for Frigidaire refrigerators. This component monitors the temperature of the evaporator coil and triggers the defrost cycle when necessary. By ensuring that the evaporator coil is kept free of ice buildup, the defrost thermostat helps maintain efficient cooling performance and prevents frost accumulation inside the refrigerator. Over time, the defrost thermostat can fail due to electrical issues, wear and tear, or temperature fluctuations. A malfunctioning thermostat can lead to excessive frost buildup, reduced cooling efficiency, and potential damage to the refrigerator's components. Symptoms of a bad defrost thermostat include: Excessive frost buildup in the freezer The refrigerator not cooling properly The defrost cycle not activating The refrigerator running continuously without cycling off This OEM replacement is also compatible with Electrolux, Gibson, Kelvinator, and Kenmore models.242046001 (AP4508400) replaces 1564839, AH2378768, EA2378768, PS2378768.