Dishwasher makes loud grinding or rattling noises during wash or drain.

Safety first: Disconnect power before reaching into the sump or accessing the base.

• Check loading: Ensure tall items are not hitting the spray arms as they rotate. Adjust loading and re‑test.
• Inspect spray arms: Spin each spray arm by hand to check for smooth rotation. Replace if cracked or loose.
• Clean sump: Remove filters and inspect the sump for broken glass, bones, or other hard objects. Remove with pliers.
• Access pumps: If noise persists, access the circulation and drain pumps from the base. Remove each pump and inspect the impeller for debris or damage.
• Replace worn pumps: If the pump impeller is damaged or bearings are noisy, replace the pump assembly.