Why Does My Dishwasher Make A Knocking Noise?
Why Does My Dishwasher Make A Knocking Noise? A rhythmic knocking sound is most likely caused by the spray arm hitting something inside the dishwasher as the spray arm rotates. To solve the problem, rearrange dishware inside the dishwasher to provide clearance for the spray arms. How do I stop my dishwasher from water hammering?