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Hi Thanks for your quick reply. EV - Escape Valve? Will it have its own pressure gauge on it? I haven't even take the outer housing of the boiler off I presume i will need to, to do this? I have all the docs/boiler diagrams from when it was installed. Mark

Hi For the last few months we have had a problem with our boiler, The central heating pressure gauge when set to 1bar can lose pressure to approx .8 but then go back up to one. Or other times continue to drop. I have checked everywhere for a sign of a leak but have been able to find nothing...