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THE PUMP IS WORKING 100%. IF I CHANGE THE FLOW RATE I CAN HEAR IT ALTER THE THROUGHPUT.

Hi, Please can you help, the whole central heating system was working OK. Now the upstairs works OK, but downstairs none of the rads are getting hot (or even slightly warm). I have checked the pump which is working, the two diverter valves are working. I have tried setting the diverter valves...