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Sylvania SM80704 microwave: after closing door continously running but no heat and unable to stop until unplug

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  • Anonymous Jul 15, 2008

    my microwave is bepping all the time

  • cporter1 Jul 21, 2008

    Sylvania microwave running with no heat

  • roderick135 Mar 21, 2009

    There is a spot of paint that keeps burning off even after I retouch it on the upper right of the door and frame.

    This is not normal!!!

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  • Microwave Ovens Master
  • 9,042 Answers

This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

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

Posted on Apr 23, 2008

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This one actually sounds like the unit is cooking when the door is closed without blowing the fuse as it is supposed to do. Unplug it from the wall and let it cool down, which it probably already is. Put a cup of cold water in it, close the door and plug it in for one minute. Unplug it from the wall and check the water. Did it heat up? I'd bet that it heated the water up. Sometimes the cook relay sticks closed and it stays in cook mode. This condition is supposed to blow the fuse but really rarely it doesn't. I've only seen this happen 3 or 4 times out of about 14,000 units I have looked at in my career.
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This is a microwave, correct?

I suspect the door lock interface switch(es) are burned out. Unplug it, be mindful of the 25,000 volts in the silver thing. Check the micro switches (look where the door closes on the top right side, probably) two positions, normally open or normally closed. check them for proper operation.

Micro switches are the most common of microwave failures because most of us open the door while the machine is running causing arc at the switch and burning up the little contacts.

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Sylvania microwave


They have that manual their site, but it's only in French!

If you don't speak French, then visit the manual download page and put in only "SM807" in the search box.

The manual for either the SM80703 or SM80704 may be close enough to yours to work.

You will need the free Adobe Reader to view or print it.

Good luck!

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

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check the door connection. it may be stiking. unplug from the wall and open up, spray wd40 and give it a clean.

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This is usually caused by either a bad door switch, but may instead be a loose door switch mount or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk

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