Scale buildup causes cavitation noise. Pump bearings or grinder burrs may also be worn.

Maybe. A failing pump makes grinding or rattling sounds. Scale buildup causes cavitation noise during heating.

Place on an anti-vibration mat. Ensure all components are properly seated. Descaling often reduces noise significantly.

Hard beans can jam grinder burrs. Clean the burrs and chute. Worn burrs also cause excessive noise.

Yes, some pump and grinder noise is normal. But sudden loud or grinding noises indicate problems needing attention.