Why Does My Microwave Run But Not Heat?
A microwave that runs but does not heat is usually caused by a malfunctioning magnetron, the part of the microwave that generates the microwaves that cook the food. Other possible causes include a faulty high voltage diode, transformer, or capacitor. It is not recommended to attempt to repair the microwave on your own due to the high voltage involved, and it is best to consult with a professional technician.