One of my Blue Series 2-1 dimmers (VZM31-SN) is ramping the load from full brightness down to nearly off and back up in slow ~3–5 second cycles, continuously, with nobody touching the paddle. The sweep is smooth in both directions — not flicker or strobing. Video attached.
Setup: single-pole wiring, Home Assistant with ZHA. Part of a larger Inovelli rollout; only this location shows the behavior.
What causes this, and where should I start troubleshooting?
Video of behavior
Did you post the right video? Your post describes an issue that occurs when the switch isn’t touched, but the video shows behavior occurring after paddle presses.
In any event, in the video, it almost looks as if the switch is rebooting. It’s a little tough to tell because the colors don’t show up that well. You would not normally see a LED bar color change after a paddle press. When the switch reboots, as it is powering up the LED bar will display cyan, yellow and then the default color.
If that is a reboot that is occurring, I would double check your wiring. Check for both loose connections and make sure the conductors are landed on the proper terminals.