If a Z-Wave device functions when it is close to the panel but not at final location, there is likely a range issue. Repeaters must be added or devices must be moved to strengthen the Z-Wave network. The following are some tips while adding repeaters. 

For more information about Z-Wave range, see What is the range of Z-Wave?. 

Important: Perform a Network Rediscovery after troubleshooting. If the rediscovery is successful, the Z-Wave device behavior may be resolved. If the network rediscovery fails, it is necessary to either add more repeaters or move Z-Wave devices again until a successful network rediscovery is achieved.

Verify interfering devices

First, verify that there are no devices that could be causing interference with the Z-Wave network. For more information about what devices interfere with Z-Wave's 900 MHz signal, see What is Z-Wave interference?. 

If there are any interfering devices, remove them or change the channel used by the device (if applicable). If that is not possible, a reorganization of the Z-Wave network layout may help, but it would be difficult to guarantee consistent functionality.

Reposition the panel and/or device 

Try moving the position of the panel relative to the device and/or changing the orientation of the device.

Some Z-Wave devices have directional Z-Wave signals. For example, a device's Z-Wave signal may be stronger to the front compared to behind the device.

Expand the network using repeaters in pairs

If there are no interfering devices and the device communicates well when it is close to the panel but not at its final location, then it may be necessary to place another Z-Wave device (that’s already on the network) between the panel and the problem device, to serve as a repeater that can relay messages between the two. Additional repeating nodes extend the overall range of the Z-Wave network, but they must be placed strategically.

It is recommended to expand the network in pairs of devices. More devices allow for multiple Z-Wave communication paths. This prevents any one device from becoming a bottleneck in the network.

For more information about repeaters, see What is a Z-Wave repeater?. 

Note: Consider the panel type. Interlogix Concord and NX systems often have the module placed in a closet, an attic, or the basement. While this may be useful for cellular signaling or for keeping the module out of sight, it can significantly decrease the module's ability to communicate with other Z-Wave devices. The same could potentially be true of other panel types as well. 

Expand the network using beaming devices

Locks and battery-powered thermostats enter sleep mode to conserve battery life, and therefore can only communicate directly with the panel or with beaming devices that can send a wake-up message. In general, devices powered off of batteries do not beam, and most (but not all) AC-powered devices beam.

Note: Newer GE/Jasco light/appliance modules support beaming, but some earlier versions did not. To find out if a given GE module is beaming compatible, check the label. The GE light/appliance plug-in module supports beaming if the date code starts with 11, or the version includes the letter a or the letter b.