The Thermostat is an OEM part for LG microwaves. This part monitors and regulates the temperature within the appliance. The thermostat ensures that the microwave does not overheat, automatically shutting off the power if the internal temperature exceeds safe levels. This preventive measure helps to avoid damage to the microwave and potential safety hazards in the kitchen.  Causes of a bad thermostat can range from normal wear and tear, which may cause the component to lose its calibration over time, to overheating incidents that permanently damage its sensitivity. Symptoms of a bad Microwave Thermostat include: The microwave unexpectedly turning off during use The microwave failing to start Inconsistent cooking temperatures or unevenly cooked food This OEM LG part is also compatible with some Kenmore models.6930W1A003J (AP4441844) replaces 1266877, 1365195, 6930W1A002D, 6930WRT003C, PS3530463.