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Thanks for the sound advice Ian & GasMan. I’ve re-pressurised the expansion vessel, and put the boiler through a number of hot ‘n cold cycles – so far, so good!

Thanks Ian, It sounds quite plausible. I shall have to dig out the manual to see how I can re-charge the vessel, if at all. Presumably if I have a leaky valve in the pressure vessel, then it should be leaking water (out of the valve) as well? Andy

I have an Ariston EuroCombi (SX 20 MFFICE) installed, and I am experiencing significant fluctuations in water pressure. I.e. swings of +3bar to 1 bar over several hours, sometimes resulting in water being dumped through the pressure release valve. As an interim, I have re-pressurised the...