My Ideal isar combi boiler is coming up to 5 years old. It has starting making a banging noise after the hotwater has been running for about 1 minute. The bang is extremely loud and frightening. It does not do this all the time. We have bled all the radiators and this has seemed to solve the problem for a while. I was just wondering if anyone has any ideas what may be causing this? [/img][/list][/quote][/code]