MICROWAVE WILL NOT HEAT FOOD AND TIMES OUT @ 30SEC'S
MICROWAVE OVEN ON HIGH POWER WHEN IT MADE A RUMBLING NOISE AND WAS ARCING FROM WAVE PAD AREA ONTO WIRE RACK. I SWITCHED IT OFF AND OPENED DOOR, RECENTRED RACK ON TURN TABLE, CLOSED DOOR AND COOKED ON HIGH POWER AGAIN, BUT THE OVEN SOUNDS LESS POWERFUL AND TIMES OUT AFTER 30 SECONDS WITH NO HEATING OCCURRING.
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I will assume that you do not have any metal items or bits of tinfoil lying around inside the oven. 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.
Most likely you have some corrosion or dried food debris inside the cooking area, or perhaps even some food particles stuck to your WAVEGUIDE COVER PLATE. A dirty waveguide cover plate can certainly cause the arcing and sparking you describe. If the thorough cleaning does not work, you may need to replace the waveguide cover. Here is a link to a short video that shows you exactly how to replace the wave guide cover yourself:
Just use your mouse to click on the link, which is the underlined and highlighted text just above. This will open a new web browser page automatically for you and allow you to view the video at the website indicated.
If the sparks are coming from somewhere other that the cooking area, then your unit may need more significant electrical repairs or service.
Here is a link to another expert's excellent Microwave Troubleshooting Guide:
YOU SHOULD NOT RUN MICRO WITHOUT ANY THING IN IT / THIS WILL OVER LOAD THE MAG TUBE . AND SOME TIMES FRY IT .. The sparking and arcing is probably a bad wave guide . this is sometimes caused by food splater / it gets in the cracks and corners and then cooks till it truns to carbon which conduts the micro's and thus arching .. clean it good and touch up any burns in the metal and repl wave guide cover. mm hope this will help .. mm
It could be that the "grinding" noise was actually "arcing" taking place inside the cavity or uder the cover. The magnatron is possibly damaged or the h.v. diode. Should be repaired by qualified repairman
Q - The microwave display counts down and the inside light is on, but nothing is heating and the fan is not running. A - This most commonly is abad door switch, other possible problems are a faulty relay or solder joint on the power module, but a bad door switch is most common. Q - My microwave is running and sounds like it is working but will not heat up anything. A - Many thing can do this but, common things are....loose high voltage wire.....poor solder joint on board.....magnetron.....power relay..... Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food? A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.
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.
I'm assuming that it doesn't microwave either. If it does...then the heater is bad. Sears parts sells them. Second guess is a blown fuse or thermosensor. Inside the pad housing, locate the internal fuse and replace it if blown. The thermosensor is a black plastic bit about the diameter of a dime and 3/8 inch thick and clamped to the side of the unit inside the control area. Test it for continuity and replace if open. If not either of these, then you have power supply issues or control panel problems. My bet: the heater blew out. Often, this is caused when you heat greasy foods.