Question about LG LRM1260SW Microwave Oven

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I accidentally covered a plate with foil in the microwave. there was Arcing (no fire) and now there is black marks etched where the foil touched the sides. The cavity seems unharmed though, it seems if I scrubbed hard enough they would actually come off. Can I still use it if I cant scrub the black marks off?

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Depends on how long the material was in contact with the walls.

It really is a **** it and see situation

Put a bowl of water in and run it for 3 minutes on full power.

If it does not arc then you have got away with it

I would be very cautious about using an abrasive to remove the marks

What you have got is little bits of metal from the tinfoil welded to the sides of your oven

If the oven is stainless steel then you might be able to pick them off with a paint scraper.

Check your user guide to see what the maker recommends that you use for cleaning the interior.

If you want to diminish the marks try using a drop of the ceramic hob cleaner or stainless steel cream cleaner

Posted on Jun 22, 2009

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Sometimes the arcing itself will cause black marks inside the oven. The places where the foil was melted, (touching), likely left small metal deposits, possibly now, impregnated in the surface. It is important to remove these if possible to avoid further arcing. Remove these then test to make sure the oven is functioning properly. If so, continue to use.

Posted on Jun 22, 2009

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Why does my microwave arch at the wave guard


Typically most arcing in a microwave is caused by food splatter. A microwave cannot tell the difference between what is on a plate or on the wall or ceiling. Every food particle in a microwave will continue to cook until it turns to carbon and will attract the microwave energy and focus it to that spot and the unit will arc. Thorough cleaning of the entire microwave cooking cavity and removal of any burn or soot mark will commonly stop the arcing. If your microwave has a painted cavity, you can even use some very fine sand paper to remove any burn mark. Always cover what you are warming and really keep the inside of the microwave clean. If your wave guide cover is made out of the Mica board, and If it has gotten wet from cleaning or from splatter, it must be replaced. You can either order a new one or order a sheet of the mica board and cut out a new one yourself. If the microwave is arcing in the waveguide, generally the unit will need to be replaced. One quick test to see if the unit will work is to remove the bad cover and place a small container of water in the unit, run the machine of a minute or so and see if it still arcs. If it does, the arcing is in the waveguide area, if not it may have just been a problem with the cover. You can run the unit without the waveguide cover in place, it is only there to prevent splatter from getting into the waveguide, so removing it to test the unit is ok. If the area inside the wave guide shows signs of soot and arcing. You can try to wipe that out with some alcohol or lacquer thinner and then try it again. Good Luck.

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see this indication and fix it. God bless you
  1. Waveguide coverSparking and arcing in a microwave can be caused by a damaged waveguide cover. Try removing the waveguide cover to see if the problem persists. Once removed, the waveguide cover can be inspected for burns, which will indicate if this is the issue. If the waveguide cover is burnt or will not stay in the proper spot it will need to be replaced.
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The cavity will have to be sanded smooth and clean and dried thoroughly.

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