hi

I have a Vaillant combi boiler. Recently when turning on the bath hot tap too full, a bellowing "basey" noise emanates from the pipes...so i've had it on at a trickle which takes ages to fill up the bath. Now the sink hot tap has a high pitched scream that can be heard around the house when you turn it on.
I would be most grateful if people could advise me what they think the problem is.

Cheers