William P Newton , NJ March 09, 2022 Appliance: General Electric Microwave PVM1870SM3SS Ge Microwave Pvm1870sm3ss: 11 year old GE space saver microwave. No power. No display. How to replace Thermostat. Originally thought maybe a fuse but first thought to look on the internet. Found this website which was very helpful. Turned out the thermostat on top of the microwave was the problem. Ordered the thermostat and spares for the future. Replaced the thermostat and problem solved. This item is inside so the cover had to be removed. While removing the cover I found a wiring diagram inside the Display Module. It was helpful although I had to trace the wires to locate the thermostat. Turns out microwaves are not that complicated. Thanks AppliancePartsPros.com for your help 10 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 2+ hours