How do I wire a dead-end 3-way with Zooz Zen21 smart switch?

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myCharlie

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The following dead-end 3-way wiring diagram shows my current setup with the Zooz Zen21, but it's not working. This wiring works fine with a simple standard paddle 3-way switch that doesn't require a neutral wire. However, since the Zooz switch requires a neutral wire, I ran a white wire from the capped neutral wire from the breaker and the light switch to the neutral slot in the Zooz, but it didn't work.
Zooz-light-switch-wiring-diagram.png


So to simplify everything, I ignore the second switch in the garage and just use the Zooz switch to try to turn on the light switch. I have the following wiring and it's not working. I have tried the Zooz Zen72, Zen21, and the Kasa HS200 single pole switch. All of these smart switches that requires the neutral is unable to turn the light on with the following wiring diagram. I've shown the motion sensor switch here for an overall picture of the j-box. I don't think it has anything to do with my dead-end 3-way switch issues here but just in case it is.
Zooz-light-switch-wiring-simple-resize.png


However, if I did the same thing with the standard paddle switch but this time capped the neutral wires together since the standard paddle switch does not require a neutral wire. It works perfectly fine with this wiring.
standard-paddel-wiring-resize.png

So, what's wrong with my wiring on the smart switches? Why is none of the three smart switches I have not able to turn on the light?
 

wwhitney

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Diagram #2 should obviously work. So if you are qualified to do so safely, you could try hooking up a bench test of the switch with a known good source circuit (or a cord and plug with pigtails) and a known good load (ideally the same load as in the garage).

If the switch works as expected on the bench test, then something is different in the garage--either your understanding of what cable goes where is not correct, so your garage wiring does not match your bench test wiring, or the load is somehow different.

If the switch doesn't work as expected on the bench test, then either it's defective, or your understanding of how the switch works is not correct.

Cheers, Wayne
 
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