Hi,
I had not tried this (had not found it in the forum), but it worked. Here is what worked for me:
- followed step 1 and 1a here: Adding a Z-wave device to Homey [Howto]
- factory resetted all thermostats
- some would include right away. Some would not
- those who would not include: factory reset thermostat and try again. Repeat untill it was found and included
Ps: held the Homey into the thermostat.
Thank you for your help!