A banging, knocking, or clacking sound coming from your dishwasher spray arm during a cycle is almost always caused by a physical obstruction where the rotating arm collides with oversized plates, poorly loaded baking sheets, silverware handles dropping through the rack, or tall pots. When the arm spins, it strikes these items repeatedly. Another potential cause is a loose mounting nut or worn center bearing that allows the spray arm to wobble and strike the bottom rack or heating element. To fix this, inspect the loading arrangement, ensure tall items are positioned on the sides, and verify the spray arm is securely fastened.
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