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My dishwasher is making a knocking noise. Is this normal?

If the sound is continuous, it might be coming from the spray arms hitting your dishes. Stop your appliance and rearrange the dishes so that the spray arms can rotate freely. Check that no items are restricting the movement of the spray arms before you start your appliance. 

 

If the sound occurs every cycle, run your dishwasher empty. If the problem persists, contact an authorised service agent.