Electric Bialetti espresso machine makes loud rattling or buzzing noises during brewing.

Safety first: Unplug the machine before tightening any internal components.

• Bleed air: Run several water-only cycles to purge air from the pump and lines. Ensure the water tank is full and properly seated.
• Check external panels: Tighten any loose screws on the housing that may be vibrating.
• Inspect pump mounts (advanced): Open the case and check that the pump is firmly held in its rubber mounts. Re-seat or replace mounts if they are worn or broken.
• Listen for grinding: If the noise is metallic or grinding rather than a normal buzz, the pump may be failing and should be replaced.

Persistent excessive noise after these steps usually indicates a worn pump or loose internal structure that needs repair.