The Magnetron is an OEM component specifically designed for Whirlpool microwaves. It generates microwave energy for efficient cooking and reheating.  Symptoms of a faulty magnetron include: Food taking excessively long cook times   Inconsistent or incomplete heating from cold spots Sparking noises emanating from inside cavity Causes like normal use diminish performance over time. Complex circuitry makes repairs difficult. This OEM Whirlpool part is compatible with Maytag, KitchenAid, Jenn-Air, Amana, Magic Chef, Admiral, Norge, Roper, and Kenmore microwave models.W11596034 (AP7187203) replaces W10278022, 8185362.