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Why-does-my-microwave-not-heat-food-anymore, a microwave that does not heat up may have a broken magnetron. this is the part that makes the heat to cook the food. if it is broken, it may blow a fuse in your microwave which could lead to other components failing. how to test microwave magnetron with a multimeter:. Disconnect the microwave from its power source. remove the microwave’s cabinet to locate the magnetron. clean up the microwave cavity if needed; discharge the high voltage capacitor to ensure that the high voltage diode is working and the mounting bolts are tightened., problem – you attempt use your microwave and instead of heating your food it just makes a buzzing noise. it is likely that it has a defective capacitor. a capacitor is a device that stores electricity. a microwave oven usually has a high-voltage capacitor that is central to the operation of the unit..

Why does my microwave not heat food anymore? when i want to heat something up, the microwave acts like it works, the light goes on and the timer works fine, only problem is that my food is still cold. is this a cheap fix or am i going to have to buy another microwave? this microwave is only about 2-3 year old and it wasnt cheap, agree, it is broken. there is a tube i believe, in microwaves that produce the waves that heat the food. a fan usually disperses the waves to make the heating more even, rather than cooking one....

The easiest way to determine whether your microwave is failing is to try to heat a food item. if the microwave doesn’t heat, or it heats more slowly than it should, this indicates that it is ..., the diode converts the a/c power output of the transformer to d/c, doubling the voltage to nearly 5,000 volts. this high voltage powers the magnetron to heat the food. if the diode burns out, the magnetron won’t receive enough voltage to operate, preventing the microwave from heating. when the diode fails, it is often visibly burned out..

Microwave runs but does not heat. if the microwave runs but is not heating, it could be one of many components. make sure the “timer” function was not inadvertently used., my first thought would be a blown magnetron. on microwaves, these can generally go dead, usually with a popping sound. i think there might also be a fuse in your microwave, but i do believe that if it was a blown fuse, your mw would not start up. the technician should also not forget the door... - microwave

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