7 possible causes and potential solutions . Microwave ovens use one or more thermal cut-outs, sometimes called thermal fuses, to protect the oven from overheating. Contractor's Assistant: Do you know the model of your Whirlpool microwave? everything else on the unit works find. the light under the unit won't turn off or go to dim mode. ... Microwave door won't open. The thermal cut-outs, also known as thermal fuses, help keep the oven from overheating.

Wmh31017as-3 … I got a new bulb and the issue is the same. They are located inside of the cabinet, often near the oven cavity or the magnetron. 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.

A problem with the thermal fuse or cut out could be the reason your microwave won’t turn on.
When the thermal cut-outs fail, your microwave won’t turn on as a safety precaution to keep it from getting too hot. Before replacing the control, check the light bulbs, sockets, and wiring.

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I have a whirlpool over the range microwave.
Find the most common problems that can cause a Whirlpool Microwave not to work - and the parts & instructions to fix them. How old is it? ... Microwave light bulb not working. 3 possible causes and potential solutions .

If the control board is not sending enough voltage to the light … If your microwave oven won’t turn on, you may have a problem with the thermal cut-out.