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From reading pages in here I see that the expansion vessel should have a pressure of 1 bar and that checking and altering this is an easy job. I've just taken the boiler front and sides off and given it a clean, while I'm here can someone tell me where I add and pressure to the vessel? Cheers

Hi I've had a quick look back over the forum and not found quite the same problem as I have. Basically the pressure keeps dropping in the central heating and therefore the boiler won't fire. If I top the boiler up to 1.5 bar it's not long before it drops again. The boiler was in the...