Noisy central heating?

I have recently had a new combi boiler fitted, since then when the heating is on I get a loud banging noise from certain areas of the house, it can be temporarly stopped by turning the hot tap on but does not last long, I have had the pipes secured but the noise is still as bad, I have a two year old who either gets no sleep or has to wake up freezing cold. HELP!!!!!

Lisa Rogers
November 2007