The Diode is an OEM part for Whirlpool microwaves. The diode plays a key role in regulating power flow and protecting other sensitive components from voltage fluctuations. Causes of a bad microwave diode can include component failure due to age or heat exposure over time. Diodes are also susceptible to electrical damage if exposed to power surges. Symptoms of a bad diode can include: The microwave failing to power on or having intermittent power Food not heating up properly or unevenly Strange sounds like buzzing or humming emanating from inside The door lock mechanism not engaging or release properly Repeated tripping of fuses or circuit breakers This genuine OEM Whirlpool part is also compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore models.W11256462 (AP6784287) replaces W10492276, W10492278, W10886077, WPW10492276, WPW10575765, 4393600, 461964697812, 4845678, 8184664, 8205361, PS12584264, W10163432, W10245187, W10575765, W11222648.