I replaced a Lutron 3 way dimmer (wiring guide here) installed by another, with a Leviton dimmer whose style and color I liked better. The far switch was just your basic toggle. Note that it was working before as a 3 way with a 'digital' dimmer of maybe 4 or 5 levels of brightness.

I used the onlne instructions of this product to determine what wires were the travellers and which was common and of course the ground. Each device, the old and new, have four wires. I wired it up as I thought it should go and when I flipped the circuit breaker, the lights went back on.

However, the problem is it's functioning like two individual single poles- call them A and B. What I mean is that you can turn the light on and off with each one individually but they won't turn off the light when the other is controlling it. It doesn't yield control and that goes both ways I think.

I really don't understand what could be happening here unless it's within the product itself. I assume the common wire is right or the light wouldn't work at all. If that's true, the traveler should be switching out unless the product is short circuiting them.

One more interesting thing is that actually there is a split second where it goes dark when I'd expect it to, but turns back on a split second later, only when I try turn off the light with A (dinner) that I turned on with B (toggle). This makes me wonder different things.

Is there something I don't know is there anything I did wrong? I'm curious to know what could be going on with this. I picked up another product, a similar 3 way dimmer by Lutron and will try tomorrow to see if just changing the device fixes it, and using the initial brand.

I don't have a picture of the old dimmer but this is the new one.

I also noticed other wires in the back of the box. Out of curiosity what would those do? I thought I shouldn't need to touch them at all and I don't want to play around with electricity.

Also I heard something about a companion switches. What are they and do I need one?