When I start the microwave, it starts to make a buzzing sound then blows internal 20 amp fuse within seconds. What could be the possible problem and is it worth repairing?
Thanks in advance
If it blows the fuse as soon as you hit the START button, it's almost certainly a shorted high-voltage capacitor.
If it blows a few seconds after you hit the START button, it's probably the high-voltage transformer. You'll possibly also smell a faint electrical burning smell from the rear vent after you shut if off.
If it blows the fuse as soon as it's plugged in, you probably have a shorted door switch, a shorted varistor, or an internally exposed wire shorting to the chassis, etc.
My experience has been rarely a shorted capacitor! check the hi voltage rectifier first gud luck!
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Wow, fridgetech, some of that wording sure looks familiar...
But to answer this, it's probably the high voltage transformer. It could be the magnetron, but probably the transformer.
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SOURCE: Microwave keeps blowing fuse
If it went dead almost immediately after pressing the Start pad, that\'s usually a shorted high-voltage capacitor.
If it went dead a few seconds after pressing the Start pad, that\'s usually a failing high-voltage transformer.
Here are some links with info on part testing:
http://www.microtechfactoryservice.com/cap_test.html
http://www.microtechfactoryservice.com/diode.html
http://www.microtechfactoryservice.com/mag_test.html
http://www.microtechfactoryservice.com/xformer.html
You can usually find helpful exploded view diagrams and order parts by
entering your full model number here: http://tinyurl.com/gv383
Please write back with your brand and model number if you need further help.
We\'re happy to help and we appreciate your thoughtful rating of our answer.
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I have the same problem. I have found that it is arcing that is
happening with the small rectangular cover inside the microwave. If you turn out the lights you will probably see flashing inside but do not look at directly! Unit is out of warranty. If there is a cost effective solution other than trashing the unit. Please advise.
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