Hello my hearing pump failed over the weekend and a new Grundfos Ups3 was installed to replace Geundfos UPS 15-50. Hot water and central heating were reinstated however as soon as the UFH was turned on the downstairs radiators went cold but the UFH became warm. I have turned everything off and turned on each element one by one but as soon as the UFH is turned on, only the hot water cylinder and upstairs radiator work/receive hot water. Everything worked fine before the pump failed. Any suggestions please.
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- May 23, 2015
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