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I didn't suspect the expansion vessel for the reason that continuous filling meant the water had to be going somewhere. Would this be an incoorect assumption. I have had a good check around and behind the boiler but can't see or feel any signs of damp. If this now means lifting the floor I...

Hi I have a Worcester 35CDi Combi Boiler that drops around 1/2 a bar pressure each week for the past 2 months. I keep topping it up expecting to see evidence of a leak but nothing so far. I have checked the pressure relief valve is not leaking. I am a bit lost to know what to do next. I...