Here's what to try if your switch goes offline or is unresponsive to Z-Wave commands:

(This is a discontinued product, replacement model: ZEN71)

Your ZEN21 On/Off Switch is a Z-Wave Plus device that has range of 100 feet (line of sight). Even so, interferences like large furniture, thick walls, and metal elements can shorten range. Ultimately range is determined by the specific structure of your home and the strength of your mesh network. If you're seeing connectivity issues with your switch, here are several things to try:

1. If there's a way to refresh your Z-Wave network, please try refreshing. This will help configure your network and help your hub find the most effective communication route to the switch.

2. Try excluding and re-including the switch directly from the installation location with nothing moved around. Similar to the idea behind refreshing the network, it's possible that the hub hasn't found the most efficient communication route to the switch; exclusion can help revitalize the connections. 

3. Try bringing Z-Wave hub closer to switch. After moving it, exclude and re-include the switch with the hub in the new spot. If the switch includes successfully, stays connected, and is responsive to remote commands, it's possible the previous location was out of the hub's range or there are too many interferences in that particular area.

4. What material is your switch box made out of? If it's metal, this may be the source of the issue - especially if you've never had good connectivity between the switch and hub. Metal is really effective at disrupting Z-Wave signals; since the switch is essentially encased in metal, it can prevent signals from being sent or received. If possible, try moving the hub closer or adding a Z-Wave signal repeater between the switch and the hub. Any non-battery powered device will do but Z-Wave Plus products will best boost the range of your network.

If none of the above solves the problem, please let us know! We're always here to help.