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I would have thought the diaphram is alright, as surely you would get water in the air when you discharge it at the valve? i'll have a go at diconnecting the vessel and checking for sludge. Boiler is in a small, built in cupboard, so will have to be removed before I can get to the vessel...

I dropped the pressure to zero, before pressurising the expansion tank to 1 bar. The boiler is a eurocombi (ariston) probably about 15 years old by my reckoning. Not at home at the moment, so don't know the model number off the top of my head. I was thinking it could be a blockage, there...

I'm having trouble with my combi boiler, the problem being that pressure builds up as its running, causing the relief valve to open and let water out. When the boiler is turned off, the pressure then drops below 1 bar, which then has to be recharged to enable it to run again, which I charge to...