I’ve been trying out a few different dimmers and switches for a new home I’m currently building, and I finally settled on the Coopers. Everything was looking and functioning great until I decided to hook up the 9540/9542 combo for a 3 way. The bidirectional association with the Minimote worked great to keep the switches synced when manually pressed, but any control from ST would throw them off. My troubles truly began when my wife had to double tap the aux to get the light to turn on in the morning. I honestly didn’t pay it no nevermind, but when the wife started to complain it was all over. I decided to try the Smart Lighting app as suggested, and it has been working great to keep the aux switch synced even when turning off the master from ST. Now, it doesn’t keep the dim levels synced but that really isn’t important to me. The way I set it up is as follows:
Which light to control? 9542
What do you want to do? Turn On
How trigger action? Switch Turned on/off
Which switch? 9540
Turn on lights when… Turned On
Turned off as well? Yes
Hope that helps someone.