Sometimes it happens that your Z-Wave device doesn’t want to pair with Homey. One of the things that can cause this is that your device is still part of another network. To overcome this you can reset your device by the following steps:
Open the Homey Desktop Application and go to Settings → Z-Wave. In the main pane, click on Remove a device.
Set your device into learning mode. You can find how to do this in the manual of the device. Homey will indicate whether the removal was successful.
You can now pair your device again to Homey via Devices → Add a device.