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Thanks for your reply. It is quite possible that the non-return valve has stuck in the closed position. Are you able to advise me on how I can cure this problem? Can the value be freed or mended or might it require a replacement non-return valve?

I have an Ariston EuroCombi boiler and the water should be fed into it until the needle in the gauge is in the Blue section. This used to be an easy operation but now, when I open the filling valves, no water flows into the boiler. The water pressure from the mains just forces off the...