The instructions on this page work for Zooz (Zen21, Zen22, Zen23 & Zen24 only) and Inovelli Three-way switch installations using a “dumb” switch as the add-on. Do not use the GE add-on switch as the add-on, it wont work.
The references to the Options are found on the website Easy Do It Yourself Home Improvements where Chris (the author of the site) has done a great job of laying out the various wiring options. I encourage you to check out his site before reviewing the following wiring solutions.
All of these options require you to wire BOTH switch boxes. Please review the diagrams carefully. In certain cases, you will also need to re-wire the light(s).
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WITH REGARD TO ZOOZ SWITCHES, THE FOLLOWING DIAGRAMS ARE ONLY VALID FOR THE ZEN21, ZEN22, ZEN23 & ZEN24. DO NOT USE ON ZEN26 & ZEN27 SWITCHES!