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Many thanks for your reply Chris. The loop is disconnected. I am probably being thick but I don't understand how the DV turns the boiler on. How can I tell what position the DV is in? It turns by hand easily and will rotate by 360 and round as many times as I want! Thanks Simon

I have a camray 5 oil boiler. The circulation pump had ceased and has now been replaced. However I have some weird problems. The pressure creaps up to 3.2 bar at which point the expansion vessel starts to leak very slightly, tuning the heat setting down keeps the pressure just under 3 bar. The...