Definition
The diverter motor is a small electric motor in modern dishwashers that switches water flow between the upper, middle, and lower spray arms during different phases of the wash cycle. By concentrating pressure in one spray zone at a time, the dishwasher uses less water and energy to clean more effectively. When the diverter motor fails, water sprays all arms continuously or only one arm at a time.
What It Does
Inside the sump there is a rotating disc with passages cut into it. The diverter motor turns this disc to one of several positions — upper arm only, lower arm only, all arms together, or bottle wash. A small magnet and Hall-effect sensor allow the control board to know the disc position. The control board chooses positions during the cycle based on the program and soil-level sensor readings, optimizing cleaning while reducing total water use.
Where It’s Located
Underneath the tub on the sump assembly. Brand examples: Whirlpool/KitchenAid use W10822098 series; Samsung DW80 series uses DD31-00005A; Bosch uses 00611702. On some models the motor is part of an assembly with the diverter disc and not sold separately.
Common Failure Signs
- Upper rack dishes are clean but lower rack is dirty (or vice versa)
- Error codes: Whirlpool F8E4, Samsung 7E or LE, KitchenAid sud or detergent error
- Audible clicking from under the dishwasher during the cycle
- Spray arms run all the time instead of alternating
- Hall sensor failure code in service diagnostic mode
Typical Replacement Cost
$180–$320 including parts and labor. The motor is $50–$140 in parts.
DIY vs Pro
Moderate DIY. Access requires pulling the dishwasher from under the counter and laying it on its back. Confirming the diverter motor (versus the control board or the wash pump) requires service-mode diagnostics. Book dishwasher repair.
Need this part replaced? Call (720) 447-8577 for same-day dishwasher repair in the Denver metro area.