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2 Answers

Kenmore Microwave blows internal fuse

Internal fuse blows after its used 3-4 times. Checked door switches and monitor and they ohm out good.

Any Ideas what to check next?


Model # 66561622100 about 7 yrs old, no other problems with it.

Thanks for any help you can provide

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  • fdnylax Jan 02, 2009

    The fuse blew yesterday and three days ago without the microwave being used. Yesterday I opened the door to put something in it and saw the light go out, I checked and the fuse was blown. So to answer your question- No the room lights do not dim, and I dont think the amperage draw is an issue since it wasnt running.

    Thanks for your reply.

  • Anonymous Mar 05, 2009

    Goldstar mod mv1502 has blown fuse 3 times and now has a continuous msg of "hit start" but never nukes anything. Fuse is not blown this time, must be magnetron.

  • Thomas F. Schneider May 11, 2010

    The main tube is now drawing to much amperage/voltage?Check it with an amp meter whicl running.DoO the room lights dim while in use?  Replace it.

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  • Master
  • 2,692 Answers

You either have a dead short or a ground on the 120 volt line going either to the unit or to the light.

Posted on Jan 02, 2009

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  • Microwave Ovens Master
  • 9,042 Answers

Is the fuse holder tight?

You shouldn't be able to easily rotate the fuse with a thumb and finger while it's in the holder.

If it's loose, that can cause a fuse to overheat and melt inside.

Is the internal cooling fan running?

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

The high voltage transformer may be failing.

This is usually accompanied by an electrical smell, but it may be slight enough that the cooling fan disperses it.

You can temporarily disconnect the fan and run it for about a minute (no longer - the magnetron will overheat) and then see if you can detect smoke or smell.

Be sure the loose connector is taped off so it doesn't contact any connections or get hit by a fan, etc.

There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.

You can find exploded views and order parts by entering your model number at the Sears parts site.

But Sears parts can usually be obtained for far less here by entering either the part or model number.

Here are some links you or someone you know can use (in order given) for test help, but read the safety warnings first:

http://www.gallawa.com/microtech/xformer.html
http://www.gallawa.com/microtech/mag_test.html
(continuity can be good even though it is bad!)


Let us know how it goes.

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

Posted on Jan 01, 2009

  • William Miller
    William Miller Jan 03, 2009

    Thanks for clearing up the situation. Now I understand what's happening.

    If
    it goes dead or blows the breaker (or GFI) when you plug it in or open
    or close
    the door, then there's a problem with a door switch or door switch
    mount.

    A helpful link:
    http://www.microwavedisplay.com/doorsw.t...


    If a switch is all you
    need, we offer a universal type for only $5 postpaid which you can
    order
    here.

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



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