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I've just fitted a digital controller(Danfoss715si) to my parent's potterton kingfisher boiler, but I can't run central heating(CH) only...Hot water(HW) has to be on also. I can do the inverse & have HW only. Is this because heating hot water when CH is on, doesn't use any more gas? so you...

Tried 5Vdc...actuators turned out to be electo-magnets as RF lightening suggested...they worked fine, but the bell didn't have a breaking contact as JohnD suggested might have...so it only went 'ding' instead of:- so it is attracted to the magnet. so it breaks the contact. so it springs...

Hi TicklyT, Are you suggesting an ac unregulated transformer output? or rectified to d.c.? Don't see how flag actuators work with ac? Thanks

....get the drift. :lol:

Thanks for reply. The bell would only 'ting' once with d.c. then?

Hi, I have just bought salvaged Servants Bell Box Indicator but need help with wiring. It is similar to the one in CRT's post 29 may 07. Inside there are actuators---apply dc? how much? Outside there is bell apply ac? how much? How would they have been wired up originally?...transformer...