The Thermostat is an OEM replacement part for Samsung microwaves. Located inside the microwave cavity, the thermostat works to regulate the temperature during cooking cycles.  Causes of a bad thermostat typically involve regular usage and wear over time. Failure can lead to symptoms like inconsistent or uneven cooking results. Symptoms of a faulty thermostat include: Longer cooking times required   Over or undercooked food in spots Temperature control issues and fluctuations Fault codes or error messages displayed This OEM Samsung part can also be used on Kenmore/Sears appliances.This part fixes the following symptomsExhaust fan not workingshuts off after a few secondsDE47-20060A (AP4220155) replaces 2079768, PS4226454.