I have a customers microwave that keeps blowing the Thermostat (53001437 ) causeing the machine to go completly dead. I checked the machine for shorts, didnt find anything. I did notice @ the house there was reverse polarity in the outlet it was pluged into, and thats where i changed out the thermostat to begin w/ and it blew instanly. I jumped the wires out and then power does come on. Do you guys no where i should look first, or should i just order another thermostat and see if the outlet was the problem...and by the way this machine has been in there for quite a while on the same outlet.