Wiring Help: Shelly 2.5 + 4-way/3-way Switch

Hardware
1

Hoping I might find some electrical wiring + Shelly gurus on this forum.

I’ve wired a number of Zooz/GE/Innovelli switches (including GE dummy switch for 3-way) in the past but the Shelly seems much more complicated for some reason. The included wiring diagram is unclear to me.

Here’s what I’m trying to do: I have a lanai with lights and a paddle-fan. The lights are controlled via 3 switches (4-way) in 3 different rooms and the fan is controlled by 2* switches (3-way). I bought a Shelly 2.5 in hopes to place it one of the 2-gang boxes to control both.

  • At some point one of the switches stopped working (Living Room). However, looking at both switches, I don’t see a traveler wire so I’m stumped as to how it worked. Or maybe I’m going crazy and it never worked?

Here is my rough wiring diagram:

image
image4032×3024 1.92 MB

In the Living Room, I have one switch labeled “Fan?”; this is the switch outlined above that I BELIEVE use to control the Fan as well but based on the wiring, I don’t see how this could have worked in a 3-way fashion.

I’d love to fix that switch however my main question is how can wire up the Shelly 2.5 to control both Lights + Fan? I’d imagine I need to place the Shelly in the Dining Room 2-Gang box as it’s the one with constant power.

I’ve watched Dr.Zs YouTube videos on this but it’s still not clear to me.

P.S.: Does anyone know of a good diagraming tool to illustrate the above better?

2

No offense but that drawing is pretty useless because it doesn’t show the interconnections between the cables going between the boxes.(which romex bundles labeled 1, or 2, or 3 are connected together, etc.?) - unless I’m missing something…

but here is a decent wiring diagram and explanation on how a 4-way circuit works.

Maybe you can look at that drawing as an example and come up with a better drawing of your existing wiring.

And yes the Shelly will need to be in the box with a neutral wire in it (dining room from the drawing above).