My Vallhorn model is E2134.
Maybe you have a routing device really close to the hub that broadcasts a stronger radio message?
You can try to clear the hub Zigbee cache:
- Shutdown the hub: Settings -> Shutdown
- Wait until the screen says is safe now to unplug the hub
- Unplug the hub for 1 minute
- Plug hub back in, wait until it boots up
- Retry to pair the sensor
As a last resort, I believe you can try to use the Zigbee Pairing Helper, but I'm reluctant to recommend this as it is overly complicated/cumbersome to use. It can temporarily stop all other devices in your mesh to be "pair-able" so the sensor can pair only through the hub.
