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I have checked the FAQs, and understand that I have to top up the pressure in the expansion vessel, but am having trouble locating it. Is there anyone out there with experience of this particular boiler type that can help?

Hi I have a Chaffoteaux and Maury Britony Combi 80 that came with the house I've just bought. Everything seems to be working well with both the DHW and CH, but the boiler makes a dreadful groaning noise when I turn on a hot tap. On closer inspection the pressure gauge is down at 0 at all...