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

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

• Check spray arms: Rotate both spray arms by hand to ensure they move freely and do not hit racks or tall items. Reposition dishes if necessary.
• Inspect sump: Remove filters and look for broken glass, bones, or other debris in the sump and pump intake. Remove carefully.
• Check installation: Ensure the dishwasher is level and securely fixed to the cabinet using the mounting brackets. Tighten any loose screws.
• Listen to pump: If a loud grinding or whining persists, the circulation pump bearings may be worn and the pump should be replaced.

Do not ignore loud mechanical noises; they can indicate impending pump failure.