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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...

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...