Recent content by Ade_Q

I helped a friend convert from an old back boiler to a new combi and we just tapped in to the flow and return at another point convenient to where the new boiler was going. We actually had both boilers plumbed in at the same time for a brief period! The CH system was essentially the same...

Chrishutt - Wiring not touched by me - I'll double check. if a micro switch is stuck, are the pump running and the occasional boiler firing the only negative effects of this?

Chris R - if i disconnect the SW live from the boiler the pump does not stop. When I disconnect the pump live it does stop.

Chrishutt - just tested each motorised valve, CH & HW off, Orange (and grey) both live and pump annoyingly running!

Okay - I'm reading everyones comments. The motorised valves work just fine. If the micro switch was sticking would this still happen? If however I disconnect the thermister the pump then stops but obviously the boiler won't fire up.

Ollski - yes I did - aren't the micro switches on the PCB? Can you advise me more fully?

Thanks for some of the comments. I bought a new PCB because I was lead to believe that's what was wrong with it. Apparently they have had a history of problems (not because I've money to burn). The system does appear to work fine, heat and water do come on and off when they should, the...

I've moved into a house with a potterton suprima 40 boiler and an unvented hot water system. After a few nights I noticed that the pump runs all the time even when there are no demands for CH or HW. All the wiring seems to be going to all the right places and there are two, 2 way valves in the...