Whirlpool (WDF560SAFM2) dishwasher not circulating water
I have a one year old Whirlpool dishwasher (model WDF560SAFM2). It recently began to skip the spraying/rinsing portion of any cycle (all tried); the bottom fills with water, it heats the water, dispenses the soap, sits, and then drains. When the cycle completes, and the display says “CLEAN,” the top rack of dishes emerge as if from a sauna, very steamy, but not clean.
The filter cup (p/n W10789806), the screen (p/n W10463906), the sprayarm (p/n W10491331), the feedtube assembly (p/n W10340745), and the drain hose have been cleaned and inspected and were not clogged.
There are a few pumps, motors, and valves in the dishwasher, but because the filling and draining functions work well, I feel that my fill valve assembly (p/n W10327249) and drain pump (p/n W10724439, shown as #8 in the following image) are both likely operating normally.
There is a vaugely-named “motor” (p/n W10854710, shown as #15 in the following image), which is part of the Sump & Motor Assembly. I am thinking this is actually a motor and circulation pump sub-assembly. There is also a Diverter Motor (p/n W10849439, shown as #18 in the following image) that is also a little suspicious in my mind.
Readily admitting I do not know enough to go purchase everything needed with confidence. Hoping you all might be able to tell me how to narrow down the culprits and test suspicious parts definitively. I have a multi-meter and 20k resistors (advised in the service manual).
Any advice appreciated. Thanks
The images are from the 2017 Whirlpool parts list (Part No. W11124289 Rev. A) for WDF560SAFB2, WDF560SAFW2, WDF560SAFT2, and WDF560SAFM2.
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