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Thanks Tomy, thats what I guessed, looks like I'll be changing it then!

I've a Worcester 350 combi boiler and when I have turned the central heating back on last week, the pressure increases to 3 bar as the system heats up but when I turn the wall thermostat off the pressure will drop back to 0.5 bar. I am having to constantly fill the boiler to bring it up to...