GE Microwave Upper Heater Thermostat (WB21X10046)

The GE Microwave Upper Heater Thermostat monitors and regulates the temperature of the upper heating element in your GE microwave or Advantium oven. It acts as a safety control that opens the circuit when temperatures exceed a safe limit, protecting the appliance from overheating during cooking or broiling cycles.

The GE Microwave Upper Heater Thermostat can fail after repeated exposure to high heat cycles, which causes the internal contacts to wear out or the thermostat to trip and fail to reset. Age, grease buildup near the heating element, or a single overheating event can also cause the thermostat to burn out permanently, cutting power to the upper heater entirely.

If you notice any of these symptoms, a faulty upper heater thermostat may be the cause:

- Upper heating element does not heat at all during cooking or broiling

- Microwave or Advantium runs but food is not browning or cooking from above

- Appliance shuts off unexpectedly during a heating cycle

- Convection or broil mode produces no heat even though the fan runs

- Visible burn marks or scorch damage near the upper heater area

- Microwave powers on but displays no heat output from the top element