As several others have mentioned, if you have multiple zones, the UII will spontaneously jump back to the first thermostat in your list.
The + and - temp buttons on all secondary zones don’t work. Instead it displays 0 as the new desired temp.
You are forced to carefully use an analog simulated wheel to make the temp change and if you don’t perfectly select the wheel, the ui will panic and scroll back all the way to the first thermostat.
There’s also the caching problem, where it lies to you. Sometimes, you can make changes and it throws them away. So, be sure to go back and check a few minutes later.
Somewhat related to the caching problem, the system will not allow you to leave the fan running all the time. Well the UI will tell you that it’s set to on, but as soon as your next scheduled event occurs, it takes over the fan again and sets it to auto.
So, if you want to follow the guidance of your HVAC installer and leave the fan running 24/7, you can’t use schedules.
There’s no way any executive at the company uses Com. I wonder whose HVAC system they use, I should switch to one that works.