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Causes-for-microwave-not-heating, your microwave may turn on but not heat up. this could be caused by a problem with the high voltage diode, which helps to power the magnetron. how to test a microwave high voltage diode with a multimeter. unplug your microwave before beginning this inspection.. The most common reason for microwave not heating could be problem with high voltage diode. high voltage diode helps to power the magnetron and is located in the cabinet. to check whether this is really the issue and to solve it, you need to unplug the microwave and then discharge the high voltage capacitor., 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..

Common causes for microwave not heating if your microwave is not heating your food but is just humming or buzzing, then it could be a caused by defective capacitor, diode or magnetron. these problems can be corrected by a microwave service technician with proper licensing. below are the common causes of the problem:, most frequent causes for microwave not heating. cause 1. diode. 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 ...


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