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Microwave seems to come on, but only heats occasionally?
I have a Kitchenaid Microwave KEMS378GSS0. So the lights on, the fan's running, and the carousel is turning, but only intermittent heating. Before you jump in with the magnetron needs replacing, please read on. The thing is, I've found pushing on the door handle or a light 'thump', is usually enough to start the microwave heating when it's not (or stop it sometimes, if it was heating.) There's a noticeable 'thrum' (noise of some electrical part engaging) when that happens, even after the microwave has already started. I figure it's either a bad sensor or a mechanical issue like a loose connection or bad switch... but I was hoping to narrow it down before pulling out and apart our 8 year old built-in combination microwave & oven.
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