I've got a fully pumped system with a conventional (non-combi, non-condensing) boiler and indirect hot water cylinder with cylinder thermostat. For some time now the radiators have been heating up when only HW is selected on the programmer; also, I've noticed that the boiler tends to cycle on and off rapidly.
I suspected the motorised valve (Honeywell V4073) but even though the radiators get hot, the CH pipe coming from the valve is cold! (inlet and HW outlet are hot as they should be.) Any suggestions please?
I suspected the motorised valve (Honeywell V4073) but even though the radiators get hot, the CH pipe coming from the valve is cold! (inlet and HW outlet are hot as they should be.) Any suggestions please?