Ok so here we go , system is a conventional Ideal Classic Boiler ( Downstairs) with open vented system. No problem until this winter and only the upstairs would warm up then hot water was tepid. Motorised valve replaced and hot water back to normal, Bleeding radiators got to be a daily process.Called in a Plumber who said everything appeared fine and suggested a Powerflush as there was evidence of black sludge (which there was) powerflush appeared to work until about an hour after the plumber left and they all Downstairs rads went cold. Pump was noisy ((Bearing noise ) so I replaced that but it hasn't improved anything. By turning all the rads off upstairs I can get them warn downstairs but not hot. So what do you think the problem is ! The only other thing to mention is that all this started within days of the hot side of our Whole House Pump fracturing and flooding the house, but I presume this is just a bad coincidence?
