Cause of Grundfos home booster making loud noise?

Our home booster Grundfos 3.0b makes a loud noise when water is being used, especially loud when toilet is being flushed. I’m hoping to get some help/advice what’s causing this issue!

Reply from 1 tradesperson

I would say this is a low water pressure problem. If it's a more of a rattling noise then it would be a damaged pump.

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