Test in Manual Mode
First, set "System" to "Manual" and use the slider in the widget to open and close the Vent.
This example shows the Vent widget for a Vent that's fully open. Dragging the slider to the left will fully close the Vent.
Note: It may take 30-60 seconds for the command to propagate to the Vent.
If the Vent is not opening or closing, try replacing the batteries with fresh, new batteries. You can also try tightening the battery holders.
Note: wait 30 seconds before replacing the batteries to allow the capacitors to drain and the Smart Vent to reset.
Every Smart Vent has to communicate with a Gateway Puck. Try moving a Gateway Puck closer to the Vent and test opening/closing the Vent in Manual Mode.
Check the Gateway Puck's WiFi connection.