When a Smart Vent powers on, it goes through an initialization sequence where the louvers open and close, and the lights will flash on and off.
If you’re not seeing the lights flash - OR - the louvers don’t move, that’s okay. As long as one happens, the Vent is considered powered on.
If your Smart Vent lights don’t flash - AND - the louvers don’t move, try realigning the back battery holder.
If the Vent still doesn't power on remove the batteries and wait 60 seconds before inserting the new batteries to give the Vent time to reset.
If the Vent still won't power on, contact Support for help.