Hi, I've noticed that the pump overrun on my worcester 18ri does not stop after demand has been reached on the hot water circuit, the pump in the airing cupboard continues indefinitely. If I call for demand on the heating circuit and then turn the room stat down the pump overrun operates for the specified 2 minutes once the boiler has ceased firing and the pump stops fine. I have a sealed system. Any ideas why the pump overrun works correctly for the heating circuit but not the hot water circuit?
Thanks
Thanks