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OK, I think everything will be OK now. The only remaining issue is the other wire to the pump, and I'm gogin to leave that dissconnected. It has been dissconnected for the past few days while I sorted through the wires, and nothing amiss has happened. It does not go through the mains...

That's the way it is wired. The other A contact on the relay unit goes to the CH off output on the controller. When the HW is on, the relay is activated and the CH off state is routed to the blue wire making it live when only the HW is on. Come to think of it, that is why the wire from the...

Yes, it's an RB2 relay box. If the valve has a neutral on the black wire, CH only on the white wire, HW only on the blue wire and both on the yellow wire, then I have it wired correctly. If none of the possibilities for the valve have those inputs then I will have a problem. I cannot see...

I had a Randall 4033 controller on my heating system and as it was a bit primitive I decided to go out and get a new controller that would allow functions like advance and different times at the weekend. I bought a “Sunvic select 207 XL” - it seemed to have the features I wanted. The...