";s:4:"text";s:1505:"How old is it? The thermal cut-outs, also known as thermal fuses, help keep the oven from overheating. If your microwave oven won’t turn on, you may have a problem with the thermal cut-out. I have a whirlpool over the range microwave. Contractor's Assistant: Do you know the model of your Whirlpool microwave? ... Microwave light bulb not working. Wmh31017as-3 … They are located inside of the cabinet, often near the oven cavity or the magnetron. ... Microwave door won't open. 3 possible causes and potential solutions . Find the most common problems that can cause a Whirlpool Microwave not to work - and the parts & instructions to fix them. Free repair advice! If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct vo... ltage to the light bulb socket. Before replacing the control, check the light bulbs, sockets, and wiring. I got a new bulb and the issue is the same. everything else on the unit works find. If the control board is not sending enough voltage to the light … 7 possible causes and potential solutions . A problem with the thermal fuse or cut out could be the reason your microwave won’t turn on.