Michael C Bismarck , ND December 05, 2014 Appliance: General Electric Microwave PVM1870SM1SS Ge Microwave Pvm1870sm1ss: Intermittent power loss on display. How to replace Thermostat (Microwave). Had to remove cover and found lose connection at thermostat resulting in the connector overheating. Replaced part with bad wire connection and made sure wire connection was tight on new part. Everything is working fine now. 6 People found this story helpful Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours