:mad: :D Hi
Why do my pipes hum. When I run the hot tap for a bath, flush the toilet then turn the hot tap off the pipes hum and make a loud noise. I have a combi boiler. Yes I had the plumber out and it didn`t do it when he was there.Typical.It did it when he had left though.LOL:D :rolleyes:

There are a couple of posts about this same problem - check those out. They have some good answers.