You may need to reset a Wireless Room Thermostat if you are swapping which Genius Hub the Wireless Room Thermostat is included onto.
To factory reset a Wireless Room Thermostat:
First, remove the Room Thermostat from its backplate using a flat bladed screwdriver and placing this in the cutout in the underside of the device, before levering the front away.
Turn the device over so the screen is facing away from you. Press & hold the 'chain' link button above the battery compartment for 20 seconds.
The Wireless Room Thermostat is now in a factory reset to default state, to add it back onto the system again go to the 'Doctor' on the app which is under the 'Main Menu'.
For more information see /wiki/spaces/HGRD/pages/2139781.