Question about Magic Chef CMV1000B Microwave Oven

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Vent fan high comes on automatically with cooking

On my brand new magic chef range top microwave, the vent blows on high with any cooking. Is this an error in installation? is there a bypass?

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  • 2 more comments 
  • ghwithkids Jan 09, 2009

    It is a Magic Chef MC0160UW. I'm not sure if installation was correct ... I looked at the guide after my friend put it in to see if there were any clues. The instructions gave some options to install ... we didn't remove anything from the back to vent out horizontally, and vertically isn't really an option either. suggestions?

  • toc6 Jan 14, 2009

    when the micro is turned on the fan makes a flepping sound like its hitting someting, have taken the control panel cover off and ran unit again the fan is quiet any suggestions.

  • MWWSF Feb 03, 2009

    I just had a Magic Chef installed today, and the fan is so high that you can hardly hear yourself think. And this is just when it's heating, not when the fan has been turned on. Does anyone know how to make it stop?

  • William Miller
    William Miller May 11, 2010

    What is your model number?

    Does the installation match the installation instructions?


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  • 8,820 Answers

Right, that would be MCO10UW and the owner's manual is here.

The owner's manual does say this, of course,

"To prevent overheating from taking place, the exhaust
fan is designed to automatically turn on at a low speed if
excessive temperatures occur. Should this happen, the
fan cannot be manually turned off, but it will
automatically turn off when the internal parts have
cooled. The fan may stay on for up to an hour after the
range and microwave oven controls have been turned
off."

That;'s standard on microwaves.

But these models do have a separate internal cooling fan (which should run any time you microwave) plus the hood vent exhaust fan, which should only run when you select it, or if there is an excessive stovetop or under-hood temperature.

So if it comes on whenever you microwave, that is incorrect.

When that happens, it's usually a defective vent thermal switch (a.k.a. hood TCO).

But since it's brand new, I would certainly contact Magic Chef about this. If it's in need of repair, they will fix it free, assuming the oven wasn't physically damaged.

For more help from Magic Chef / Ewave see here or their contact page.

For Magic Chef in Canada call 866.587.2002

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

Posted on Jan 10, 2009

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