Dawn A Spencer , WI February 29, 2016 Appliance: General Electric Microwave JVM1540DM4WW Ge Microwave Jvm1540dm4ww: Microwave didn't heat and turntable didn't turn. How to replace Microwave Primary Interlock Door Switch. After ordering the door sensing switches it turned out that one of the sensors just vibrated loose and wasn't making a connection. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes