My boiler is a Vaillant Ecotec Plus.
Programmer, 3 port valve, room and cylinder stats are all Honeywell. Y Plan wired.
The boiler flex is fed from a fused spur through a cord outlet and it is behind here that the wires from the airing cupboard are connected to the programmer (3 wires, all labelled and connected to the correct terminals in the programmer).
The other wires are L N E. I have 1 wire (red) connected to the switched live of the boiler and then a mystery (black) wire.
My problem is that I have moved my back box up by a couple of inches. All of the wires that were connected when I disassembled have all gone back to the right place. The black wire wasn't connected when I took things apart, but it may just have broken when I took the cord outlet off the wall.
So my question is simply, should this black wire be connected to the switched input of the boiler. Testing it through, I haven't actually found where this wire comes from - its not in the terminal box in the airing cupboard. I assume it is from the room stat, although I do need to confirm this. It is live when the room stat and the programmer are calling for heat.
This may seem like an obvious question, but I don't want to common this with the red until I am sure incase it shorts out and kills something in the system.
Thanks in advance.
Programmer, 3 port valve, room and cylinder stats are all Honeywell. Y Plan wired.
The boiler flex is fed from a fused spur through a cord outlet and it is behind here that the wires from the airing cupboard are connected to the programmer (3 wires, all labelled and connected to the correct terminals in the programmer).
The other wires are L N E. I have 1 wire (red) connected to the switched live of the boiler and then a mystery (black) wire.
My problem is that I have moved my back box up by a couple of inches. All of the wires that were connected when I disassembled have all gone back to the right place. The black wire wasn't connected when I took things apart, but it may just have broken when I took the cord outlet off the wall.
So my question is simply, should this black wire be connected to the switched input of the boiler. Testing it through, I haven't actually found where this wire comes from - its not in the terminal box in the airing cupboard. I assume it is from the room stat, although I do need to confirm this. It is live when the room stat and the programmer are calling for heat.
This may seem like an obvious question, but I don't want to common this with the red until I am sure incase it shorts out and kills something in the system.
Thanks in advance.