When a dishwasher makes a humming or buzzing sound during a cycle but fails to spray water through the arms, it usually indicates a water supply issue or a circulation pump problem. Common causes include a closed water supply shut-off valve, a clogged or defective water inlet valve, a jammed circulation pump motor, or air trapped in the pump housing. Check that the household water valve is fully open, inspect the inlet valve screens for mineral clogs, and listen closely to determine if water is filling the bottom basin before the wash cycle begins.
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