Four Parts Had Been Changed, but the Upper Rack Still Did Not Wash
The motor, diverter motor, diverter switch and turbidity sensor had already been replaced. The discussion did not confirm a final fix.
What had already been tried
- The complaint was limited to poor washing at the upper rack.
- The motor, diverter motor, switch and turbidity sensor had been replaced.
- The diverter came from an aftermarket source rather than the manufacturer.
- The technician was considering the control board next.
The same symptom can have a different cause on another dishwasher.
This is not proof that the same component is responsible in another dishwasher. The source ended before an OEM diverter or any other proposed check produced a reported result.
Checks that remained open
The discussion first separated a setting problem from a hydraulic problem. If “lower rack only” is selected, upper-rack behavior changes by design. Without that option, both zones should wash. Storm Wash was suggested as another observable operating condition.
The remaining physical checks included a restricted upper spray arm, weak inlet flow and clogged valve screens or solenoids. The experts also noted that the diverter's initial installation position was not expected to determine operation.
What to verify before replacing the control
- Confirm that a rack-only option is not selected.
- Inspect the upper spray arm and feed path for an actual restriction.
- Compare water delivery under normal and Storm Wash operation.
- Verify the installed diverter part and its operation before condemning another component.
- Record which wash zone receives pressure during each test.