My central heating is not firing on automatic and whilst checking the actuator I have found an unconnected yellow wire in WB12. Everything works fine if I switch Actuator to manual but only hot water comes on when in automatic position. Actuator = Danfoss HSA3. I don't know how to post a wiring diagram so have listed below the seven wires that enter the WB12 and wonder if anyone can tell me if the unconnected yellow wire should be connected and where.
Wire 1 Red = 2, Blue = 3, Yellow = loose, Green/Yellow = 10
Wire 2 (actuator) Blue = 2, Orange = 5, Grey = 6, Brown/White = 8
Wire 3 Red = 9, Blue =11, Yellow = 8, Green/Yellow =10
Wire 4 Red = 6, Blue = 9, Yellow = 7, Green/Yellow = 10
Wire 5 Red = 12, Black = 11 Green/Yellow = 10
Wire 6 Red = 12, Black = 11 (can't see a G/Y)
Wire 7 Blue = 5, Brown (red?) = 7, Green/Yellow = 6
Also terminals 2 and 11 are connected with blue wire plus 3 and 5 with red.
Hope this makes sense
Wire 1 Red = 2, Blue = 3, Yellow = loose, Green/Yellow = 10
Wire 2 (actuator) Blue = 2, Orange = 5, Grey = 6, Brown/White = 8
Wire 3 Red = 9, Blue =11, Yellow = 8, Green/Yellow =10
Wire 4 Red = 6, Blue = 9, Yellow = 7, Green/Yellow = 10
Wire 5 Red = 12, Black = 11 Green/Yellow = 10
Wire 6 Red = 12, Black = 11 (can't see a G/Y)
Wire 7 Blue = 5, Brown (red?) = 7, Green/Yellow = 6
Also terminals 2 and 11 are connected with blue wire plus 3 and 5 with red.
Hope this makes sense
