Question about LG Microwave Ovens

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There is a square piece of cardboard inside the side of the microwave which is now damaged and keeps falling down. Can it be replaced and what is it there for?

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  • yvonne60 May 22, 2008

    Thanks for the advice, at least I have an idea of what to do, the manual gives no indications that the waveguide cover exists.

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  • LG Master
  • 9,030 Answers

This is the waveguide cover, and it's actually made of plastic or mica.

It is very important - it protects the magnetron and waveguide from grease and food particles, which - if allowed to build up - can cause arcing and damage.

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 or damaged, it will need to be replaced.

For Goldstar / LG / L.G. help, call 1-800-243-0000 (M-F, 7am-8pm CT, Sat 8-5 CT) and choose the appropriate prompt from the menu or visit http://www.lgservice.com.

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

Posted on May 22, 2008

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The cardboard foil piece is falling apart. Is it dangerous if don't put any?


That is a piece of Mica that is called the Wave Guide Cover.
It is very important as it stops food particles from entering the magnetron output aerial.
You must replace it. Contact an appliance repair centre for replacement.

Jan 14, 2011 | Danby DMW1153 Microwave Oven

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On the inside top right side of the microwave there was a cardboard cover held on by 4 corner points. The cardboard has fallen out now as it has come unsecured from the points holding it in place. Is it...


That's the waveguide cover.

If your waveguide cover is burned or damaged, it will need to be replaced.

It provides critical protection for the magnetron.

You should be able to get Galaxy parts from the Sears site.

To find helpful exploded view diagrams and get part numbers, you can just enter your full model number at the Sears parts site.

A full Galaxy/Sears/Kenmore model number has 3 digits, a dot, then 8 more digits, such as ###.########


We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Sep 06, 2010 | LG MS-0744Y Microwave Oven

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Microwave turns on for 5 seconds, then shuts off. Notice their is a paper cardboard (???) that is screwed into the right side that has a small hole into. Perhaps there is a built in saftery device if this...


To allow us to help you effectively (at no charge), please post a NEW problem to FixYa, and please include your brand name and the full model number from the tag in or on the unit, as well your symptoms "Microwave turns on for 5 seconds, then shuts off".

Please also not whether the display stays on or shuts off.


The object you're describing is the waveguide cover. It needs to stay clean and secure. If it's damaged, it will need to be replaced.

It provides critical protection for the magnetron.

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unless you are familiar with these, leave it alone. Over time small particles of food become carbonized inside the oven, hence the electrical display. the solution is to clean it after every use.

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That piece is called the waveguide cover. Emerson calls it a spatter shield. Behind it is the hole where the microwaves enter the oven. Its job is to prevent food spatters from getting into the microwave source, and it's not a good idea to run the oven without it.

The cover is usually held in place by a plastic rivet that pulls out. I couldn't find the part number for the cover used in your model. But here is a link to a parts place that has several covers available:

http://www.a-1catalog.com/wavandstirco.html

If one of the covers shown looks like yours you can order it. Another possibility is to contact Emerson at 800-695-0098. This is the number they give to locate authorized servicers near you, and you might be able to order a replacement cover through them.

Hope this has helped. If so, please take a moment to rate the solution. Thanks for asking here!

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No, that is the "waveguide cover".

It provides very important protection for the magnetron.


And always keep it clean according to your manual's instructions.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Jan 18, 2009 | Oster 0.7 Cu. Ft. Compact Microwave

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Waveguide cover for Kenmore microwave


Try replacing the screws with larger ones. Maybe you ordered the wrong piece, if your microwave comes with a mica cover (A fine, square piece of mica) and you received a plastic one, you will need to get the right piece or adapt the one you received.
You can get the mica cover on any microwave service.

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