I am having a problem getting a GE 12723 Add-On switch working with a GE 12724 Smart Dimmer.
Before I start, I have a number of these I have installed in my house. Both the Smart Dimmer and numerous Add-On in three and four-way configurations. All of them work fine and I am very familiar with the wiring, my own wiring, and how they should be wired.
All boxes have neutrals, and I have had no problems with any of them except this one.
When installed, the Dimmer works perfectly. The add-on switch, however, will only TURN OFF the lights when you press UP, as in turn on the lights. Pressing down does nothing. Once you press up on the add-on switch and the lights go off, nothing else you do on the add-on switch has any effect.
But the dimmer switch continues to work properly.
It is the strangest thing. Just to make sure I did not have a bad dimmer or add, I have replaced both and the same problem. I have done dozens of these installs and this is the first time I have had any issues at all.
Anyone have any ideas? I cannot for the life of me figure out this behavior and a number of hours searching and reading has not provided any answers as I have not been able to find anyone else who has seen this.