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

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

• Check spray arms: Ensure spray arms spin freely and are not contacting tall items in the racks. Rearrange dishes or remove obstructions.
• Inspect sump area: Remove filters and look for broken glass, bones, or other debris. Carefully remove any foreign objects.
• Access pumps: If noise persists, access the circulation and drain pumps from below. Remove them and inspect impellers for debris or damage.
• Replace noisy pump: If the pump bearings are worn and the motor is noisy even when clean, replace the pump assembly.