Hi all - I have the misfortune of having to work on this boiler this week, it has some "issues" which I hope someone will be able to shed some light on. No.1 Circulating pump runs 24/7 regardless of wether there's call for heat or DHW it just runs constantly ? MI say's it should shut down I even disconnected all the stat plugs from the board and it still runs ?? No.2 Diverter valve problem - I checked the actuator/valve off the board & it's ok, have checked the pin on board connector but when the relay clicks in for the CH demand ie turning the stat on the front panel theres no live on the pin to move the valve over ?? and yes I've tried a new pcb ! please help as my brain is turning to mush everything checks out ok stat wise - don't no where to start looking next ....