The Microwave Thermostat is an OEM part for GE Countertop Microwaves. It is a critical component that monitors the microwave's internal temperature to ensure safe operation.  Causes of a bad thermostat can include failure of internal components due to prolonged heat exposure during cooking cycles over many years of use. Steam and splatters introduced into the microwave from heated foods can also damage sensors. Symptoms of a bad thermostat include: Inability to heat or reheat foods adequately  Short cycling of the microwave interior lights  Erratic power levels during cook functions Overheating errors or shutoffs for safety This replacement thermostat is also compatible with RCA and some Kenmore countertop microwave models.WB27X11212 (AP5791056) replaces 3026293, PS8754627, SE-7350-006, WB24X28948, WB27X10854.