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Now this is a cracker. I was called to service the boiler and check the heating system which by all accounts was working fine, but how this was true I don't know how. If your central heating pump is this way up on a fully pumped system? If this is the case call your local registered plumber. The owner of this installation had put up with noise for four years, strangely the heating and hot water worked, well that's what I was told and lucky the heating F&E was made of fibre glass and not plastic as the would of had a burst tank due to the hot water that was being pushed up and out the expansion. The system was put in by a local "plumber" who I think must sell cars when he is not plumbing. I fitted a new pump, removed and cleaned out the F&E tank, fitted a new ball valve with new float as the old one had started to fill with water which was starting to play havoc with Archimedes law. Archimedes (298 BC- 212 BC) was the greatest mathematician of ancient times. A native of Syracuse. Archimedes' principle is the fundamental natural law of buoyancy, first identified by the Greek mathematician and inventor Archimedes in the 3rd century BC. It states that any object floating upon or submerged in a fluid is buoyed upward by a force equal to the weight of the displaced fluid. In short the ball valve would have started to free flow at some time, like two days later and we may of had the phone call "our overflow is running" with those words " It was alright until you touched it"
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