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Microwave is Sparking or Arcing

The 3 most common part(s) or condition(s) which cause the symptom Microwave is sparking or arcing are listed below starting with the most likely. Check or test each item and watch any available videos.


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To see parts for your microwave, you need to enter your model number on the right. The system will then display parts that are associated with your microwave.

Waveguide Cover

If the microwave is sparking or arcing the waveguide cover might be damaged and shorting out. Try removing the waveguide cover and see if the problem goes away. If there are any damaged spots in the microwave ceiling or sidewalls, repair them and paint them with microwave oven paint. Replace the waveguide cover if it is burnt or if it will not stay in place.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your microwave, you need to enter your model number on the right. The system will then display parts that are associated with your microwave.

Microwave Oven Paint

If the microwave is sparking or arcing on the side walls the paint might have chipped causing pitting in the metal oven wall. Use microwave safe paint to touch up any bare metal spots.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

To see parts for your microwave, you need to enter your model number on the right. The system will then display parts that are associated with your microwave.

Rack Support

If the microwave is sparking or arcing near one of the rack supports, remove the support, repaint any bare metal, install a new support.

Enter your model number for the best repair help results:


What is a model number, and where do I find it?

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