The Thermostat is an OEM component for Samsung microwaves. It plays a critical temperature control role inside the microwave cavity. The thermostat is designed to accurately sense and regulate interior temperatures ensuring food is cooked safely and evenly.  Causes of a bad thermostat can include wear and tear over time, exposure to moisture or spills inside the microwave, or damage due to impact.  Symptoms of a bad thermostat include: Inability to reach desired power levels  Food not heating uniformly or thoroughly  Erratic or premature shut-off of heating cycles Excessive smoke or burning when reheating foods This replacement thermostat is also compatible with GE, Frigidaire, KitchenAid, and some Kenmore-branded microwaves.DE47-20034A (AP4219754) replaces 2079750, PS4226431.