@rv75 Yes, it almost certainly sounds like something is wired wrong. If I had to guess, I'd say that one of the travelers has been swapped with the load wire in the load-side box. (You'd have to beep...

@rv75 4-Way switches don't have an on or off. They have a "this" or "that." They also have a long break-to-make time that can kill power to any Kasa downstream. Check out my video. The animation at...

@ejayb A 4-way switch won't function at the end of the circuit -- and the Kasa 3-way will suck power from any active line, so it is hard to disrupt their juice. You're probably going to have trace...

@Augustlion This thread is long enough that it might be time to plug my deep-dive video on this topic here again. It may help you. https://youtu.be/kMT7KUVTELo

@spatical Thanks. You have excellent taste! I'd be happy if they'd simply comment on whether the "dead" traveler voltage is artifactual or intentional.

Yes, Chicago_SH, they absolutely do detect current. This thread inspired me to make a deep-dive video about all of these questions: https://youtu.be/kMT7KUVTELo