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Many thanks for replying Yes I have traced the filling loop, from the stoptap to the boiler and out again, and followed it all around the house. There are radiator pipes under the floors, however the circulating noise isnt coming from those pipes, it the ones that lead to the upstairs taps...

Hi I am hoping I can draw on your experiences to fix my central heating problem. We have an 18 month old saunier duval f 30 e combi. We have been hearing a water circulating noise from our pipes which serve the taps ,for about a week, when the heating was off and there were no taps running...