W10843811 Whirlpool Dishwasher Diverter Motor – The direct fix for a Whirlpool dishwasher that won't clean the top rack, leaves dishes dirty on the upper level while the bottom rack cleans fine, has poor overall wash performance, won't switch between spray arms during the cycle, or displays a diverter-related error code. The diverter motor is the small actuator inside the sump that directs pressurized wash water between the lower and upper spray arm zones. Instead of splitting water pressure across all spray arms at once (which weakens cleaning power), the diverter alternates full pressure between zones in a timed sequence — lower spray arm, then upper spray arm, then back — so each zone gets concentrated, high-pressure water for thorough cleaning. When the diverter motor fails, it gets stuck in one position — typically directing all water to the lower spray arm only. The result is a bottom rack that cleans normally while the top rack comes out with food still stuck on dishes, cloudy glasses, and residue. In some cases, the diverter gets stuck directing water to the upper arm only, leaving the bottom rack dirty. A completely failed diverter motor may trigger an error code on the control panel. There is no way to manually override the diverter — it must be replaced. This genuine OEM Whirlpool part directly replaces W10537869. Fits Whirlpool, KitchenAid, Maytag, Kenmore, Amana, Jenn-Air, and Ikea dishwashers. 20–40 minute DIY repair.