I have corridor lights (12 of them) linked up to two 3-way dimmer's. The lights were dimmable from both sides and all worked fine. After replacing some connections in the bathroom (separate to the corridor), I noticed the hall lights would not switch on.
More specifically, they would switch on for a split second before dimming down. The time it would switch on for has decreased rather dramatically, with the lights being on for barely half a second before switching on.
I had a look at one of the dimmer, and it seemed the internals were completely broken, so I had the dimmer replaced but they dont seem to switch on. Removing the dimmer (the replacement one) and connecting the red wire to the blue wire, the lights switch on.
I had triple checked my wiring when replacing the dimmer; red going to live, yellow going to slave, blue going to the other one. This is also in occurdence to the other dimmer.
How would I go about troubleshooting this and what could be possible causes for this behaviour (and fixes)?