Yeah, a noisy booster pump is a common callout in the docs. It's usually trapped air bubbles in the system.
You need to backflush to clear them out. Press the banana-shaped water volume button and the round water-making button at the same time. This triggers a 1-minute manual backflushing cycle. That should push the air out and quiet things down.
If the noise persists, check for limescale buildup. That can also disrupt flow and cause noise. You'll need to descale the unit using a commercial solution or a 50/50 mix of white vinegar and water in the tank, run a 1.5L cycle, let it soak for 10 minutes, then rinse thoroughly.
Make sure your feed water pressure is within 0 to 0.2 MPa. Too high or too low pressure can strain the pump.