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Many Thanks for your replies. I have noticed that the pressure drops over a period of about a month so there is a leak somewhere I guess. Would a "dead leg" be a pipe left after removing a radiator since that has not been done since the boiler was moved (due to removal of an internal wall). It...

Hi All, We have a Vaillant boiler which has recently been moved by a corgi registered plumber. Unfortunately two problems seem to have developed. The first sounds like something is hammering inside the boiler and the second is when we turn the cold water tap on, the boiler starts up which...