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Microwaves work by friction. They blast water molecules in the food so they move fast, just like rubbing your hands together makes them hot. Some types of microwave in defrost mode actually apply FULL POWER for a short period of time so to make the product warm to the touch. This heat then penetrates down to the core of the food, ensuring full defrost. In your case the heat was sufficient enough to heat the dry paper towel to set it on fire.
Bread is better defrosted on the low power setting as sliced bread is very thin. Items should only be defrosted on the defrost setting that are thick and need to be completely defrosted on the inside. Remember microwaves only penetrate the surface of food, making that hot. Thermal conduction does the rest.
You should never use paper towels in a microwave unless the instructions for doing the food say so. You wouldn't put a paper towel in a gas or electric oven, so don't put them in a microwave.
The problem is most likely the magnetron, there are two other parts that can be a factor, the high voltage capacitor and diode all work together with the magnetron to heat the food. If fixed by a professional cost for parts and labor can be high.
Check the door safefy interlock switches before you plunk your $ down.
If you open your oven to check the contents without turning the oven off first ... the tiny switches arc and start to burn ... once they cannot make contact ... the oven doesn't know if the door is open or closed so it will not turn on the heat.
If it does not heat, with all other functions working, the problem lies with the magnetron circuit. The magnetron is the part that makes the microwaves to heat the food. Typically, the magnetron fails and shorts out. Symptoms when this occurs is a loud hum from the oven and does not heat the food. The replacement magnetron costs are close to the price of a new microwave oven, so it rarely pays to have it fixed.
Normally when u cook food in microwave the fod is cooked by microwaves, which means the heat is generated with in food. The temperature inside is never too hot and all the heat produced is absorbed with in the food.
On the other hand when the grill is switched on, a separate heatting element gets switched on. You can see this red hot element on the top side of inside of microwave. the heat from this element gets transferred to food through air circulation. But partof heat also gets transferred to the walls of microwave oven. This is the reason the wall feel hot during use of grill.
As i see ther is no problem with the microwave itself. Jut kep delicate thngs a bit away from the microwave.
Sometimes inside the machine there is a fuse for this, if you can remove the outer case you should be able to see it, HOWEVER let me tell you that i have been in this position and have replaced the fuse and the machine then works only to die again, once this happens it is usally a sign that either the tube or a transformer is gone and it normally isnt worth getting fixed.
This is normal. That's why I always recommend to my customers that the food be placed slightly off-center on the turntable.
An analogy I refer to is stirring paint: If you stir paint with a stick by simply rotating the stick in the center of the can, it's far less effective than pulling the stick around an imaginary circle halfway bewteen the center and the edge.
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