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Re: why my microwave want heat or defrost?
If it is working but not heating, then test the high voltage
capacitor,the rectifier diode.or the magnetron. If all this are fine,
test the control board.If turntable is not running check also the door
capacitors can be tested. The capacitor must be allowed discharge before
testing, or you risk to get electrocuted, evenif power is off.Capacitors
can get discharged by shorting their two contacts.
Before replacing the magnetron test also the control board.
Replace the magnetron if the checks and all of the high voltage component tests are good, but the unit still does not heat.
All locations, and description of this parts can be located using the diagram here: Counter top.
Parts must be tested to find out what is wrong.
Remember that microwaves are potentially dangerous devices if not repaired properly, the job must be done by a competent person.
A microwave energy leakage test must always be performed when the oven is serviced for any reason.
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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.
What is need to set the program, select defrost function then select the weight of the food to be defrosted and push the value of the weight. Now select the heat value and press start as the processor will then decide the time to defrost.
This is a simple program setting or else you can choose a preset heating defroster program.
the microwave does not weigh things. you need to know the weight for things like auto defrost. 1 pound ground beef... enter auto defrost ..10 will read 1.0 ... 1 1/2 pounds... enter 15 ..reads 1.5.... 1/2 pound enter 5...reads 0.5 . unit beeps half way through heating program.. open door.. turn meat over close door. will continue to defrost