Microwave sparking hole in fibre will replacing fibre fix problem

Kent, most microwaves will turn on the light when you open the door. As for the fan coming on, does it do that all of the time or only after you have used it for a period of time? If it does only after you have used it, you might want to check the back and the underneath of your microwave to see where the fan draws air into the unit and clean any lint built up on the vent holes. Hope this helps!

follow this steps and fix it. God bless you

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.

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.

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.

It is a mica plate.

well the Teflon has a hole in it exposing metal if it is in that shape id say its kinda old microwave i would just replace it if i were u

Is it an electrical spark noise or is it actually sparking inside your microwave oven? Watch as you heat something. This also might appear to be the bulb flickering, when it's actually a sparking. I only know how to fix it if it's an actual spark, or what might be called "arcing." This is not supposed to happen.

Inside your microwave, there is a "cover" over the area where your bulb is. If this cover has a burned place in it, or an actual hole in it, then it's your "waveguide cover." And this is the easiest thing to repair. I myself will not attempt any electrical repair, but this waveguide cover was a breeze.

You have to purchase replacement material... Then, when the replacement material arrives, remove the wave guide cover from your microwave, trace it, cut it out and put the new one in. It is very easy to fix. Sort of like paper dolls....

Google "waveguide cover" and you're on your way! IF that's the problem....

A dirty or damaged wave guide cover can cause sparks, fire and noises. You can order a replacement wave guide cover from many appliance parts websites for less than $15 in many cases. It should fix the problem.

Arcing is often the result of the cover over the magnatron (The thing that produces the microwaves) being aged, burned or damaged. If you look inside the oven, you will see a cover (usually square or round and around 3-5 inches across depending on the machine)made from a flakey silver plastic/fibre material. If this is burned or has a hole, it needs replacing and this will probably cure your problem.

Ok stop useing oven and unplug! THIS CAN BE FIXED!!! Go to a home improvment store and buy a small bottle of white liquid enamal....Clean up the area that is missing and flakeing and then apply the enamel over the hole and let dry overnight! now that the exposed metal is covered back up it is safe to use and will not spark or cause any more soot!
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The Magnetron has failed, causing the waveguide to become damaged. If the waveguide is damaged/burned the microwave can not be repaired and should be replaced.