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Plastic on roof of microwave burned a hole in it from the top down, not food

Plastic on inside roof burned from the inside to the outside. What is cause and is it safe to operate?

Posted by Anita on

  • Anita
    Anita Dec 31, 2013

    A service person was here and is only replacing the plastic cover. He didn't know why the hole burnt in the plastic. Its on the roof of the microwave, not the door.



5 Related Answers


William Miller

  • 9179 Answers

SOURCE: Door outer plastic plate slide down an inch from the top

You would probably need a service manual, for which you can contact LG at 1-800-243-0000 or

Or locate a local servicer:

Normally you have to separate the door panels (as shown in the attached photo) and then you'll see the screws you need to remove.

Posted on Nov 22, 2007


William Miller

  • 9179 Answers

SOURCE: Burnt package of vegetables in my microwave

You will need your full model number from the tag on the unit.

You can order parts from Encompass (formerly Tritronics). Or you can call them toll-free at 866-779-5835.

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

Posted on Mar 06, 2009



  • 1 Answer

SOURCE: Light bulb burns hole in the plastic cover

Same issue here. I just bought 4 covers from for $5.50 US each. I shipped them to my PO Box in Buffalo for an extra $6 bucks. Part number was 1206433

Hope this helps

Posted on May 17, 2010


D. Floyd Kolb

  • 43501 Answers

SOURCE: my microwave roof suddenly started

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The capacitor went up in smoke..

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Microwave Oven Basic Troubleshooting Tips


Posted on Sep 01, 2010


  • 8909 Answers

SOURCE: I covered the plate with

The food is safe as long as the food has not got oxidized aluminium on it.
Microwave energy is very high and will melt metals!
As long as it is not arcing any more there should be no problem.

Posted on Jan 03, 2011

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That's the waveguide cover whichcovers the opening where the microwaves enter the cooking cavity. What happens is food spatters (especially grease and sugar) on the cover absorb the microwaves and cause the spots to heat, so the cover gets burned. The oven will actually operate without the cover, but it's needed to protect the antenna of the magnetron tube (the microwave source). If food gets back there and burns, it's usually doomsday for the tube and time for a new oven.

The replacement is GE part number WB06X10591. It's available from these folks. I do a lot of business with them, so I can recommend them. Here's another source that has it at a lower price, but I don't know anything about the company. You can also try calling appliance parts places or repair shops and give them the number; they may already have the part in stock.

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What is a stirrer cover, the plastic part over the fan inside the top of my Sanyo microwave is burning.

That burning part is referred to as the stirrer cove, unless you have one similar on the bottom.It's like plastic pie plate. The fan stirs the microwaves and heat in simple terms.

Unless food is burning off it , I would be replacing the unit or have a qualified, trained microwave tech service it. You need a microwave leak detector to work on them safely. Given the cost most are disposable these days. Be Safe on this one

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Burned inside of microwave

This is the the stirrer cover, and it provides important protection for the magnetron and must be replaced.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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

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Signs of burning on inside of plastic door surround .

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Crackling/sizzling sound

If you're hearing a crackling noise and don't see any sparks, you may have a magnetron that is arcing inside the waveguide. Once this arcing occurs, in some cases, replacing the magnetron may not be enough to fix the problem. There was also a noted problem with some models where the stirrer motor shaft inside the waveguide would arc when the magnetron was energized. This too, caused damage inside the waveguide. If the internal walls of the waveguide become damaged it cannot be repaired and the unit must be scrapped. The waveguide has a special coating to help propagate waves of RF energy. If the walls are damaged due to arcing this special coating gets burned off and will continue to arc even if a new magnetron is installed. This will eventually lead to magnetron failure and potentially cause a fire inside the oven. I would think seriously about looking into another unit if any of this may be occurring in your oven. Better to play it safe, especially with small children. I hope you find this advice helpful. PS A new magnetron can run as high as $250.

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