Dishwasher spray arms can stop rotating during a cycle for several common reasons. The most frequent cause is improper loading, where oversized plates, baking sheets, or long utensils hang down below the rack and physically block the path of the spinning arm. Other causes include severe hard water mineral scale buildup locking up the central bearing hub, a clogged water feed tube, low water fill levels due to a faulty inlet valve, or a broken mounting clip that causes the arm to wobble, sag, and jam against the dish racks during operation.
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