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Hello again I decided that the previous problem with my system had to be the pump (see my previous post 3 upstairs radiators working, the rest are cold) - replaced it eventually with much swearing! I had to drain the system to do it 'cos the gate valves were stuck. Now when I try to refill...

Hi, can anyone help me? We have a fully pumped hot water and central heating system, gas fired not combi boiler type. Yesterday morning when the heating came on only 3 of the radiators were working - first three on the circuit, all upstairs. The obvious cause would be the pump, but it...