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Blown fuse Hi.. I have a Kenmore 89942 over the stove (hood type) microwave oven. It's approx. 10 years old. Today it just shut off. Upon taking it apart, I found the main fuse on the hot leg of the incoming power was blown. Should I try to replace it, or is there generally something more serious causing it to blow? Is there any danger in replacing it to see if it blows again? Thanks, Ed

Posted by Eddddd Alexander on

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  • Eddddd Alexander Dec 30, 2006

    Thanks for the quick reply. I changed the fuse today and the microwave seems to work - I heated two cups of water to test it. Until I cook or defrost something I wont know for sure if it's ok.
    Would it be safe to use if it keeps working, and what could cause this to happen? (fuse was not loose, but I cleaned & tightened the contacts) Also, what is the average life expectancy of a microwave? Mine is 11 yrs. old and used regularly.
    Thanks again for your help! ED

  • Eddddd Alexander Dec 30, 2006

    Hi-one more question - will the fuse blow BEFORE anything dangerous happens? Thanks

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William Miller

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Be doubly sure your microwave is unplugged first, of course! Be sure the fuse is not loose in the holder. If you can rotate it in the holder easily with just a thumb and finger, then it's too loose and the holder should also be replaced. That looseness causes a heat buildup, which makes the fuse melt open inside over time. If the new fuse blows as soon as you hit START then you likely have a shorted high-voltage capacitor. If it blows again a few seconds or minutes after you hit START, then you likely have a bad high-voltage transformer or magnetron. It's not inherently unsafe to replace a fuse, as long as you heed the safety rules. The microwave does contain and prodcue voltages that can be instantly lethal. Feel free to see my safety info via my listing here on FixYa: http://tinyurl.com/yzjozk

Posted on Dec 29, 2006

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