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Hi guys, A new problem on my vintage boiler - pressure drops to zero when CH is off, and the PRV dumps water outside (into plastic bottle on the overflow pipe). Topping up via the filling loop seems to go very quickly. Am I correct in thinking that the expansion vessel is not pressurised...

Hopefully one of you expert guys can help me with this one. The boiler will not fire up when a tap is opened, with the RH switch in the instant position. The water section diaphragm has been replaced (was knackered), pin works fine; the pair of microswitches which the pin operates has also...