Question about DeLonghi MW 535 Microwave Oven

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Microwave problem Hi there when i start using my microwave, sparks fly out from the inside of the microwave. There is a metal panel scewed to the inside of the microwave wall where sparks are flying out.

Posted by stephen kwan on

  • 1 more comment 
  • bbell8 Mar 18, 2008

    I have a GE with the same thing out of the metal plate sparks fly while it is running

  • ghotaling Apr 15, 2009

    I have the same problem with my Sharp Carousel 1200 Watt, but only when I am melting chocolate, butter or other high fat foods.



    I don't see any rivets on the mica or metal panel on my model. Will it help to just clean the panel without removing it?

  • Anonymous Mar 24, 2014

    I have a new AEG Microwave Combi Oven. When I use the microwave I am left with puddles of water on the floor and the walls run with condensation. I have not experienced this previously with other microwaves. Any solution, please?

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1 Answer

William Miller

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  • DeLonghi Master
  • 9,179 Answers

That panel is probably mics, not netla, though it may look like metal. The job of the waveguide cover is to protect the waveguide (opening) and the magnetron from buildup of food particles and grease. When the grease and food particles build up on and behind the cover, they will carbonize and arc - and maybe even flame up! The solution is to clean it and keep it clean - but if it's too dirty or is burned, it must be replaced. Sometimes it's necessary to remove the cover to clean both sides of it, and to clean the edges of the opening it covers. It is sometimes held in place with a small plastic rivet (or screw) and once that is removed, the cover will slide over a little then drop down. Be VERY careful not to get cut on the potentially sharp edges of the opening, and do not spray anything into the opening. Apply an alcohol-based cleaner (such as the purple kind) and /or gentle scouring powder to a cloth or paper towel and carefully wipe it out, then when it's dry, reinstall the cover and the rivet. I suggest to my customers that they NEVER use any ammonia-based cleaner (like the blue stuff) on a microwave, since the ammonia will crack and distort polycarbonate plastics.

Posted on Apr 23, 2007

  • William Miller
    William Miller Apr 23, 2007

    Sorry, I meant to say it is probably "mica" not "metal"

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Sparks fly when I use my microwave!!!

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.

It can be fragile, and the metal edges of the oven behind it can be sharp, so be careful!

In some models it is a larger stirrer cover type made of thicker plastic in the ceiling of the oven.

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.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

We're happy to help and we appreciate your thoughtful rating of our answer.
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