An espresso machine goes through more steps when brewing coffee than a drip-filter coffeemaker. It grinds beans, its brew group moves, the pressure is compensated during brewing and frothing milk: this creates not only a different taste of coffee but also produces other sounds.
Small changes in the settings can already affect the sounds produced. If unusual sounds occur:
"If there are foreign particles in the bean container, e.g .pieces of wood, small pebbles or something similar, the grinder can also produce unusually loud noises. Clean the grinder to remove foreign particles. Empty the coffee bean hopper and use a vacuum cleaner to remove any residues from the grinder. Never pour water into the coffee grinder."
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