Dishwasher is very noisy during operation, with grinding, rattling, or humming sounds.

Safety first: Turn off and unplug the dishwasher before internal inspection.

• Check loading: Ensure spray arms are not striking tall dishes or utensils. Rearrange items if necessary.
• Inspect sump and pump: Remove filters and look for bones, glass, or other objects in the sump that could contact the pump impeller.
• Level the appliance: Adjust the front and rear feet so the dishwasher is stable and does not rock. Use a spirit level.
• Replace noisy pump: If the circulation pump makes a loud grinding or whining noise even when clear of debris, its bearings may be worn and the pump should be replaced.