It will not cook. The oven does not even get warm.

All microwaves do have a "transmitter" tube called a magnetron. It has to put electrical power into microwaves. To do so it gets warm or even hot. As soon as the transmitter is to hot, it must be cooled down. Most of the time it can be cooled without a fan. But as long as the thermostat indicates it is to hot, the system will cool. Even when you switched the system off. Don't unplug the microwave when it is still hot. It could damage the magnetron.

It may be making noise, and the light comes on, and the turntable goes around, but I'll bet it's not actually cooking (although that CAN happen). Try putting a cup of water in the microwave when this happens and see if it gets warm. If it does NOT get warm, then you just have a bad door switch. If it DOES get warm, then you have a stuck relay on the control board, and the control board will have to be replaced.

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Hi,

Here is a tip that will help you to figure out what is wrong with your Microwave Oven....

Basic Microwave Oven Troubleshooting Tips

heatman101

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In all likelihood the mangnetron is failing, or perhaps even the Power Supply is faulty. You need to have it serviced by a reputable service centre/man.
Ensure you get a firm "Quote" before proceeding, and remember these days the cost of repair can equal or exceed the price of a new one

first check the h.v. diode and the h.v. capacitor,one has opened up and is not producing h.v. to operate the magnetron tube,the cap is about 4" long and oval in shape with 2 wires coming out the one end,the diode is about 1-2" long black and can be square or round and are near the magnetron tube area of the oven,chk these first they're the cheapest to replace

Sounds like the magnatron tube or it's fuse.

its your magnatron tube, that is what makes the microwaves. the part # 492603, you can order it at marcone.com it should cost $100-150, if the micro is more than 6 years old I might not fix it.

If it's not making a strong buzzing sound or anything out of the ordinary, it's probably the Magnatron. Most of the time that's what I find. It's the "antenna" that creates the microwaves. Some ovens carry a 5 year warranty on that part so I would check your manual. They are very easy to replace most of the time. They usually run about $100-$150.00

the buzzing is the magnatron tube juicing too thousands of volts before emmitting the micro-wave radiation to what your cooking that turns molecules 180 degrees around... guess that friction is what really heats it.
radar ovens is what they use to call em and even people would stand in front of big ones to warm up long ago...lol canibles will love that.