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Electrical Requirements:
Microwave -  110 - 120 volt, 60 hertz, properly grounded circuit protected by a 15/20 amp circuit breaker or fuse. #14 gauge house wire minimum for 15 amp protection, #12 gauge is a must for 20 amp protection. A separate (dedicated ) circuit serving this appliance is recommended.



Microwave help page

While standing by a functioning magnetron, Spencer noticed that the chocolate bar in his pocket had melted. His keen mind soon figured out that it was the microwaves that had caused it, and later experimented with popcorn kernels and eventually, an egg, which (as we all could have told him from mischievous childhood ‘experiments’), exploded.

The first microwave oven weighed about 750lbs and was about the size of a fridge!

Danger! You can receive a serious electrical shock from the components inside your microwave oven--even when it's unplugged. Only a qualified appliance repair technician should perform any repair.

How do i check a microwave diode?
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How to check a microwave capacitor
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How to check a microwave door switch

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My plates heat up but not the food

Dishes that get hot in the microwave, are not "microwave safe"...that means that there is some element in the dishes that absorbs microwave energy. Something like metal in the glaze or in the dish itself. Unless, or course, you are cookiung something like rice in them that takes at least 4 or 5 minutes and stays hot so long that it heats the bowl.
Test the dishes for microwave safety by putting a glass container of water and the dish in question in the microwave....heat for one minute...or until the water boils and test the temprature of the dish. If it's hot it's absorbing microwave energy.

My microwave dosen't work at all,no lights.
Fuses Usually, when your microwave oven doesn't work it all, the internal fuse (thermal fuse) is blown. This fuse protects both you and the oven. When it blows, you need to have a qualified appliance repair technician replace it. Door switch If the fuse isn't the problem, check the door hooks and the door-release button. When these are broken, the door switch doesn't activate, so the oven can't work.

 My microwave sounds normal, but there's no heat
When the microwave sounds okay, but there's no heat, one of the internal door switches, the high voltage circuitry, or the circuit board may have a problem. To resolve this problem, you need the assistance of a qualified appliance repair technician.

My microwave carousel won't turn.
Although the carousel is usually driven by a small motor that's unrelated to the heating function of the microwave, the microwave cabinet needs to be opened to repair it. So we recommend that you seek the assistance of a qualified appliance repair technician. Inspect the plastic drive coupling that the tray sits on, as well as the ring-and-roller assembly, to make sure that they're working properly.

My microwave has intermittent cooking problems.
Many over-the-range microwave ovens suffer from intermittent problems caused by excessive moisture from the range/stove entering the microwave cabinet and collecting on the circuitry. Often the problem is with one or two simple connections that may need tightening or soldering. But, to repair these components, the microwave cabinet needs to be opened. So we recommend that you seek the assistance of a qualified appliance repair technician.

My microwave display flickers.
If the display flickers mildly and doesn't affect the way the microwave works, don't worry about it. However, if the flickering is severe and coincides with cooking problems, you need to pursue a solution. Because repairing this component requires opening of the microwave cabinet, we recommend that you seek the assistance of a qualified appliance repair technician.

 My microwave no heat, but it buzzes loudly.
When the microwave won't heat, but you hear a loud buzz, you usually have a defective power diode, high-voltage capacitor, or magnetron. We recommend that you consult with a qualified appliance repair technician for help in determining the problem and deciding what to do about it.

My microwave looks like there's lightning (arcing) inside my microwave.
When you see arcing inside your microwave, it's because of food or liquid left in the cavity or on the wave-guide cover: If the wave guide has any burn spots, replace it and clean the unit well. If the cavity has any burn spots, spot-sand it smooth and touch it up with microwave interior paint. Note. If there are any burn holes in the cavity, don't use the unit-seek help from a qualified appliance repair technician.