thanks johnnie
took pump off and sure enough dirt in both valves now working much better but still getting warm radiators on the first floor above the boiler seems to be gravity (ie hot water will rise) going up the return any ideas
Just fitted a Grundfos pump plan (twin headed pump) in place of a three port valve due to constantly sticking. When the central heating is off and the hot water still on the radiators are still getting warm. It would appear to be hot water pump back feeding the central heating system. Flow...
