I've had seldom/occasional incidents of buzzing and sparking while cooking in my microwave.

inside your micro... walls are made of metal but protected with paint, if this paint is gone and the metal shows thats what happend you have to repaint the unprotected areas again, and the reason your micro... is not working so good anymore is due to the magnetron

It sounds like you have a shorted cook relay on your control circuit board.

That can usually be repaired more economically than replacing the circuit board.

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

If the loud buzzing noise is present when cooking food, the magnetron is the likely cause, some models are louder than others. But if the buzzing noise is there without the microwave running it should be checked. No! this something that should be checked by a professional for safety.

If the sparks are happening on the inside of the microwave's cooking area while you are cooking, then make sure you clean the inner surfaces really well. Be sure to remove any cooked on food particles that may have splashed up during cooking.

If the cleaning does not work, you may need to replace the waveguide cover. Click on the following Youtube video link for an instructional video on the process:

http://www.youtube.com/watch?v=M0xsXjhefy4

If the sparks are coming from somewhere other that the cooking area, then your unit may need more significant electrical repairs or service.

Thank you very much and good luck.

sounds like the program bord is faulty,, when your finished cooking leave the door open a little that will save the microwave from trying to cook nothing?

I have a microwave above my stove also but it has not done what yours is doing. I would try a lower watt bulb since it would not give off as much heat. You may need to replace the lens or else just take it out and get rid of the problem altogether. You would have a brighter light anywas even if you kept the same bulb. Most of those bulbs are florescent and do not put out much heat anyway and seldom cause heat problems, esp. giving off enough heat to melt something.

I would recommend changing the diodes as well. This will usually take care of the problem.

Your problem is due to the "magnetron" arcing to the wave guide within the microwave. Picture someone arc-welding stuff together inside the microwave casing, that's essentially what's happening. It is a fire hazard and you should stop using the microwave immediately. As far as I know, there isn't a recall on that particular model (though there was on another similar Kenmore/Whirlpool model) so if it's out of warranty, you're out of luck.

check halogen light holder and connections, and any damage body, check inside body of microwave oven , because of microwaves some sparks comes from damaged body..

Have you tried putting a cup of water in it and cooking on a low power level? If it buzzes only when it is on the cook cycle, that would narrow it down. More detals might help us help you, including the model number.