Question about Microwave Ovens

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My SMH4150 microwave appears to be working, but is not heating . It is 5 years old and there is a smell of burning plastic. Everything else seems fine.

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Check the door safety interlock switches.

Do you regularly shut the machine off by opening the door? Each event causes a small arc on the tiny contacts and will burn them. When they can no longer make contact, your microwave doesn't know if the door is open or closed. The machine must know the door is closed to turn in the magnatron (that thing that makes the heat).

Remove the cover and check the microw switches with a volt/omh meter.

Thanks for your interest in FixYa.com

Posted on May 08, 2010

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