3 gang 2-way light switch?

hi i have 3 way switching on my lights in the hallway but had to change 1 of the switches but did everything right but when i go to the far switch and turn off none of the other 2 switches will be able to turn the lights back on unless i switch the further switch back on then the other 2 switches will work again does anyone no why this is happening thxs

dave clark
April 2012

You have old wiring which you should consider replacing.
Ignore all colours as in many cases changeover switches were not wired to any standard.
First you need to identify the live connections and feeds to the lights. Working with the mains ON and all lights switched off use a neon screwdriver to identify the live feeds.
Now one at a time turn the lights on and note which lines are now live.
You can work from there or feed back with more information and I'll respond again.

John Errington
September 2008