Question about KitchenAid KHMS155LSS 1000 Watts Microwave Oven

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Microwave makes a thumping sound then no heat

My Kitchenaid has an intermitant problem with heating. at startup when there is one thump it works fine. when there are multiple thumps like 4 to 6, then i get no heat and nothing on the display telling me anything is wrong.

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Sounds like the hi voltage diode or capacitor are intermittant, the thump is the transformer drawing current when the magnetron tube calls for hi voltage to operate, you will see the lights dim slightly every time it cycles the mag tube for heat

Posted on Oct 13, 2009

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Posted on Jan 02, 2017

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Is it a rhythmic thumping, or intermittent, or one thump when it first starts?

If it's rhythmic, it may be a failing turntable motor or stirrer.

If it's a thump just when you hit Start or when the magnetron turns on at the beginning of the cook cycle, it may just be a common noise that they sometimes make due to the magnetic field produced by the high voltage transformer.

Please write back with more details if you need further help.

We're happy to help and we appreciate your thoughtful rating of our answer.

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