Customer Questions and Answers for Microwave Thermal Cutoff Thermostat by Ge

Felix, You will want to test the door switches to ensure that they are good. If the switches are good then test the magnetron for a resistance of less than 1 ohm. If this checks ok then test the thermostats in the unit for continuity as one could have gone bad.

Hello Steve, the 2 thermostats behind the control panel (one shows continuity, one does not, are correct) the open thermostat is used for powering the vent motor independent of the control should the MW underside get hot, at this point, you would need to uninstall the microwave, remove the outer case and check the 20 amp fuse on the noise filter board and the cavity thermostat mounted under the outer case on top of the oven cavity on the left side about the middle. Since the MW went dead in mid-use those are the parts to check.

Bob, With the door in the closed position, the center switch should show continuity.

Bob, With the center door switch showing continuity open or closed then the switch will be faulty and need to be replaced.

Hello Curt, one or more of the door switches have failed. These can be tested using a multimeter after unplugging the microwave from power and accessing the switches. The manufacturer supplies the switches/cam and bracket as an assembly, part WB10X35397.

Abe, The vent hood thermostat should have an "open" circuit at room temp. and two pink wires attached to it WB27X11034 / WB27X11034 thermostat plate. The bottom TCO should have a "closed" circuit at all times and a black wire and a red wire attached to it WB20X10048 / WB20X10048 160 dgr. thermostat/fuse. The WB27X11034 should be the correct thermostat to order for the exhaust vent motor.

Hello Joe, you can test the fuse on part number WB02X35865. This noise filter is located on the power cord right before it connects to the board. Thanks!

Parminder, There is one thermostat located behind the control panel that will show open for continuity. Check the door switches on the unit as this would be the most likely issue. If the door switches are good then this will most likely be an issue with the main control board.

Repair, the cavity thermostat is the main part that will open up it there is excessive heat in the oven cavity it will open up and shut everything down. Check to see if it is open or closed. It is located on the upper left side of the microwave, and you will need to take the unit down. The part number of the thermostat is WB20X10052][

Repair, There are two thermostats mounted side by side on the bottom plate The thermostat on the right, with the pink wires attached to it will be the vent hood thermostat and will have an open circuit. If/when the bottom of the microwave gets hot, the thermostat closes and supplies power to the vent fan motor to cool the interior and control components. The thermostat on the left with the black/red black wires attached to it is the hood TCO, it should have a closed circuit. if the bottom of the microwave or interior get's too hot the thermostat will open and eliminate power to the control board and other components and the microwave will be inoperative,"dead" until the thermostat cools down and resets to a closed circuit.