After exhaustive research, I settled on the Cooper Aspire 9540 & 9542 dimmer switches as I want/need full direct control at each three-way switch as well as voice control via Alexa. However, it appears that I get either one or the other and not both.
I have multiple sets of three-way switches set up with the 9540 Master and 9542-Z Accessory dimmer, and in every case I can’t get the accessory to work as intended. I’ll use my Kitchen setup as the example, but all of three-way switches appear to (not) function the same way.
I have a 9540 Master that works correctly. The on/off and dimming functions work as intended, as well as with ST and by extension, Alexa. The problems come into play with the 9542 accessory switch. I can’t get it to work reliably, and the dimmer function doesn’t appear to work at all.
I have used Smart Lighting, with the following settings:
Which lights do you want to control?
What do you want to do?
Turn on & set level
Dimmer Level 90%
Turn on & set level lights when:
Turn off as well: Set to ‘on’
However, when utilizing this setup, here is what happens:
Start with lights off (both Kitchen 9540 & Kitchen 9542)
Press Kitchen 9542 once and lights dim ‘up’ to 90%. ST reports both 9542 & 9540 are ‘on’.
Press 2nd time and 9542 & 9540 still report on, and the lights dim up again.
Press 3rd time and nothing happens. LED’s on the dimmer count up to the ‘on’ position. 9542 & 9540 are reported ‘on’ via ST.
Press 4th time and 9542 LED’s dim ‘up’ and is reported ‘on’ via ST, but lights do not turn on and 9540 still reported as ‘off’.
Press 5th time, adn LED’s on the 9542 dim ‘up’, but are dim as though the switch is off. The lights turn on and the 9540 & 9542 on ST are both repoorted as ‘on’.
Press 6th time and 9542 LED’s dim 'up, and appear to be on, booth 9542 & 9540 are reported on via ST, and the lights remain on.
Press 7th time, and switch LED’s dim ‘up’, appear that switch is off, lights in the room dim ‘up’ from the on position back to 90%, and both 9542 & 9540 are reported ‘on’ in ST.
At this point the last two actions simply repeat and there is no way to turn off the lights in the room from the accessory switch. At no time does the dimmer function ever actually work from the accessory, either.
I’ve tried all different settings I can think of via Smart Lighting app, but this is as close as I can get to actually working, but obviously it is not acceptable.