DIY Doctor UK DIY Forums

Hi everyone, new member here with a problem that I'd like some advice on please. I'm having trouble with the 2 way wiring between my upstairs and downstairs.

Downstairs, there is a double switch. The right hand switch as you look at the front turns the downstairs light on and off. The left hand switch works the upstairs landing light. However, the function of this- and of the single upstairs landing light switch- depend on the position of each switch- i.e, sometimes it won't work from downstairs until the upstairs is switched, etc. This is driving me nuts!

This is the back of the downstairs switch, looking down from above. Just the black and red of the down stairs light on the left of shot, and the 2 way wiring on the right of image-



-and this is the back of the upstairs switch, again looking down the wall from above- single black, blue and yellow wires, and two red wires joined together with a piece of terminal block-



Amy suggestions please? Thanks!

How unusually to use school boy two way wiring. The right hand switch as I am looking at it would be the two way and it seems to be wired correctly for that method.

To avoid needing to have the connector block the more normal method is this but either method works. I would guess there is a break in either the yellow or blue cable.

Thanks for the reply, though I'm not certain that I follow it. So either the upstairs switch is wired incorrectly, or there is a break in the wiring? (Which I'd not considered- I just assumed the connections were wrong somewhere)??

As far as I can see it would seem you have a break in a wire. So either the yellow or blue seem likely open circuit. What test equipment have you got. A wired door bell so you could "Bell out" the wires would be enough but you need some sort of test equipment.