Dishwasher is unusually noisy during operation (grinding, rattling, or loud humming) with no error code.

Safety first: Turn off power before reaching into the tank or accessing the pump.

Reducing noise:

• Check for loose items: Inspect the wash chamber for utensils or broken glass that may contact the wash arms.
• Inspect spray arms: Rotate arms by hand to ensure they clear racks and tank walls. Replace bent arms or worn bushings.
• Clean pump impeller: Access the Champion wash pump and remove the cover. Clear any debris from the impeller and housing.
• Tighten hardware: Check mounting bolts for the pump, motor, and panels. Tighten any loose fasteners.

When to call a technician: Persistent grinding or humming may indicate failing pump bearings or motor, which should be replaced by a professional.