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Thanks, will give that a try. What should I be looking for in pressure change as it heats up, lots or little? I think it rises about a quarter of a bar when the central heating starts pumping.

Hi, Our combi boiler system has been leaking pressure these last couple of months. It is leaking faster and faster. It now needs re-pressurising almost every day. We have had the boiler serviced and they claim there is nothing wrong with the expansion vessel. The pressure relief valve has...