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    hot water in taps and only uptairs radiators hot, downstairs cold

    hi, My hot water comes as timed , but when I switched the heating on from the controller the boiler stops. However I do get the upstairs radiators hot but not the downstairs ones while ther is hot water in the taps. The pump is a Selectric Grundfol 15 -50 -130. It gets very hot! I have opened...
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