i had a new heating system fitted 7 months ago, and now i have got three problems with it, the first is the boiler keeps switching on and off,up to 20 times in one hour,until water up to temperature, there is a sound of rushing water in the pipes going to the boiler (sounds like toilet flushing) and the most annoying is the constant banging noises from under the floorboards upstairs. all this starts at 4 a.m when the hw switches on but is the same with just ch on. i would be grateful for any advice. many thanks. hayden