Question about Microwave Ovens
Quite often this is due to grease or food particles stuck to the inside of the oven or stuck on or behind the waveguide cover.
The waveguide cover is usually about the size of a playing card and often held in place by a plastic rivet.
In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.
It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!
The cover and the metal behind it should be cleaned with a mild, non-ammonia cleaner.
If the cavity metal of the oven is chipped or charred, it will have to be sanded smooth and clean and dried thoroughly.
Then you can apply some high-temperature appliance paint, available from places like Wal-Mart, Lowe's or Builder's Square.
If your waveguide cover is burned, it will need to be replaced. It provides important protection for the magnetron.
If the magnetron is damaged, it will have to be replaced, too.
If you or someone you know decide to look into it, we have critical safety information and disassembly information at our site, and our link is at our listing here on FixYa.
You can usually find helpful exploded view diagrams and order parts by entering your full model number here.
There may also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.
If your brand and model are not shown, Please reply back with your brand and model number so we can help you.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Sep 25, 2008
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Posted on Jan 02, 2017
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the microwave is sparking or arcing the waveguide cover might be
damaged and shorting out. Try removing the waveguide cover and see
if the problem goes away. If there are any damaged spots in the
microwave ceiling or sidewalls, repair them and paint them with
microwave oven paint. Replace the waveguide cover if it is burnt or
if it will not stay in place.
the microwave is sparking or arcing near one of the rack supports,
remove the support, repaint any bare metal, install a new support.
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