The Magnatron is an OEM part for Frigidaire microwaves. It is the principal electronic component responsible for converting electrical energy into microwave radiation, allowing for fast and efficient cooking or heating of food. Causes can be related to normal component fatigue over extended use. High voltage magnetron coils are also susceptible to power fluctuations or surges over time. Symptoms of a faulty magnatron include: Inability of the microwave to transmit energy and heat foods Slow or ineffective cooking times Oven light working but no microwave output Overheating, arcing or burning smells from the unit This OEM Frigidaire part is also compatible with Electrolux, Gibson, Kelvinator and some Kenmore models.5304521745 (AP6891982) replaces 5304440781, 5304472253, 75304472253.