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Thanks very much for the advice. The new plumber says that they did drain the system when they installed the new boiler, so is it possible it wasn't done thoroughly enough/at all, and that could be causing the problem? Thanks again! :D

Our last boiler failed 6 mths out of Warranty, due to all the 'experts' concerned failing to notice the constant drop in pressure etc was due to it having a large hole in it-! Had a new Mistral Combi boiler installed about 2 years ago, which makes 'steam engine' noises after it's fired (which...