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    Hot water but no or little flow in radiators

    I have a fully pumped central heating system - Potterton Sprima boiler 80L (about 4 years old), Grundfos Selectric pump, Honeywell Sundial Y Plan 3 position diverter valve, Potterton programmer. I have had a number of problems with the system. The main problem is that when HW & CH are both on...
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