The Inverter is an OEM replacment part for Whirlpool microwaves. It regulates the magnitude and duration of electromagnetic waves generated during cooking functions.   Causes of a faulty inverter can include general wear from prolonged use or damage from power surges entering the microwave. Symptoms include: Inconsistent or incomplete heating of foods   Sparking or burning smells emanating from within Control panel errors or failure to properly sense wattage settings This OEM Whirlpool replacement ensures precise electromagnetic wave output. Compatible with KitchenAid, Maytag, Jenn-Air, and select other branded microwaves, the inverter restores consistent cooking performance.W10217711 (AP4364512) replaces W10510105, 1472288, 8206087, AH2342258, EA2342258, PS2342258, W10120229, W10326551, W10468206.