I am using the Blue Series Smart 2-1 in on-off mode.
I followed the guide below
Here’s a diagram of my wiring situation
Red is line/load, green is traveler.
S1, S2A, and S3A are Inovelli switches
S2B and S3C are way dumb switches, common is the top left terminal
S3B is a 4 way dumb switch, common is both left side terminals
There are 2 circuits, 3 smart switches, 3 dumb switches, 3 light groups. Note: I didn’t mark the ‘common’ terminals on the 3/4 way switches in the diagram, but they are wired correctly.
From the bottom of the diagram:
Circuit 1 has 2 light groups; a set of 4 room lights, and a single wall light.
The set of 4 room lights is marked as L1 in the diagram controlled by the switch marked as S1.
S1 is an Inovelli switch and working as expected.
The single wall light is controlled by the switches marked as S2A and S2B.
I put another Inovelli switch at S2A
I wired it up as described here
S2B is a 3 way switch - Leviton Decora 15 Amp 3-Way Switch White R62-05603-2WS
This setup doesn’t work at all. The Inovelli switch doesn’t affect the light, but the dumb 3-way S2B turns the light on and off. The Inovelli switch is setup as 3-way dumb in HA. The Inovelli switch does react to changes in HA such as turning the notification LED on/off, color, etc.
Circuit 2 has 1 light group; a set of 3 lights controlled by 3 switches.
S3A is the Inovelli switch.
S3B is Leviton Decora 15 Amp 4-Way Switch White R58-05604-2WS
S3C is Leviton Decora 15 Amp 3-Way Switch White R62-05603-2WS
I have it wired up as shown here
The first time I wired this, I had the 4-way wired wrong and popped one of the Inovelli switches. I fixed the wiring, and when I tried again with the Inovelli switch I had in S2A the switch didn’t get blown but the up paddle felt stuck. I could press the down paddle and hear a click, but the up paddle won’t click at all.
The switch is setup as 3-way dumb in HA and again it reacts to HA changes.
The other two dumb switches sorta work, some combinations of on/off work but others case one of the lights to quickly turn on/off. I had a similar issue with the S2 light group, but replacing the LED bulb in the fixture fixed that issue.
What am I doing wrong here? When I replace the Inovelli switches with dumb 3 way switches both light groups work as expected without any obvious issues. I even took out my phone to see if the lights were flickering weirdly in a unnoticeable way.