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Repair Your Sparking Microwave Oven

By Edited Sep 5, 2016 5 9

sparking microwave
Did you toss a bag of your favorite popcorn into your microwave and press start only to see a sparking display worthy of the 4th of July? It is a very scary thing to see those sparks and hear a deep zapping sound inside your microwave oven. Your first thoughts were probably about the big, unexpected expense of replacing your microwave, but that may not be necessary. Chances are that this can be solved by a simple repair that will require one part and one minute of your time.

If you tilt your head down and look at the side or back of your microwave oven, you will see what looks like a small plate that screws or snaps into an opening called the waveguide. This plate is called a waveguide cover and its job is to keep moisture and bits of food from ending up in the working parts of your microwave.

The first thing to do is to remove the waveguide cover and check for food particles on the cover itself, or on the wall of the microwave around the cover. Small bits of food stuck to the waveguide cover, or around the edge, will spark and create that unnerving light show. You can use warm soapy water to clean both the cover and the wall of your microwave. Do not use abrasives or sharp objects to clean your microwave's waveguide cover as this could damage it.

If the sparking has caused a hole to be melted in the waveguide cover you will need to order a replacement at one of the many online appliance repair parts warehouses. The first thing to do is to find your microwave model number. The location of this model number varies widely, but can usually be found on the back or on a label inside the door of your microwave. Using this model number, visit a few of the websites that sell appliance parts and enter your model number in their parts search tool. Be sure to make a note of the part number that you find. This part number can be used to easily find the part on other sites and comparison shop since you are sure to find quite a variety of prices for this small microwave part.

While you are waiting for your new waveguide cover to arrive, it might be tempting to try and cover the hole with a piece of tape and keep on cooking, but that would not be a good idea. Chances are anything you try and cover the hole with will either melt or cause sparking itself. You could try using your microwave oven without the waveguide cover, but you run the risk of ruining your microwave oven if food or moisture contacts any of the internal electrical parts. Your best bet is to try and spend a few days without the microwave oven, if you can. It may feel like a return to the distant past when food was warmed on a stovetop or in the tradition gas/electric oven, but imagine the joy you will have when your new waveguide cover arrives and you can again enjoy the modern convenience of your microwave oven.



Jun 22, 2010 12:28pm
I never knew this could be so easily repaired! I wish I had known this earlier!
Jun 26, 2010 1:51am
This article is perfect to read before July. Independence day is only about a week away, and people don't need to go out to see fireworks.

Excellent article. Thank you for sharing.
Jun 27, 2010 2:53pm
If we can fix some things ourselves we can save money. You've given a good description of how to do it.
Jun 27, 2010 11:24pm
Ha ha! This started happening with my popping corn! I figured metal got in my microwave somehow! Guess what, I tried this- and it worked!! THANKS!!
Jun 28, 2010 7:25am
Neato article never would have even thought to fix my microwave myself.
Jul 31, 2010 5:01pm
Great information to write and share about. Nice work!
Aug 2, 2010 9:09pm
Hopefully now if that ever happens I won't see dollar signs flash in front of my eyes!
Aug 8, 2010 10:44am
This is a great article. I'm sure that hundreds of microwave ovens are discarded when all they need is this little fix. Thanks!
Nov 21, 2010 7:27am
This is a great article and will help many people I reckon.
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