Microwave-not-heating-and-burning-smell, watch the microwave during use. if there is no light when the microwave is in operation but it heats food properly without noise or odors, the bulb is burned out and should be replaced.. I was given a microwave that worked for one night and then suddenly stopped. it was making a loud buzzing noise and wasn't heating at all so i decided to see if i could fix it. let's see what's ..., if your microwave has a loud buzzing and food does not warm up, try replacing your diode. part # for my microwave de91-70063d..
A microwave works by creating rf or radio frequency energy by way of oscillating magnets. this frequency is then magnified and the food absorbs it, heating up. a number of issues can arise with a microwave, some signaling the imminent failure of the device., ok so if you smell burning, that generally means that either your magnetron is shorting out, or the transformer is beginning to fail. the only way to really know which part is failing is to uninstall the entire microwave and remove all the screws going into the outer shell of the microwave..