If you can't use the touchscreen of your thermostat, please check the following cases :
- if the Boost mode is activated, then the touchscreen will be disabled until the Boost mode ends. If it's necessary, stop the boost mode clicking again on the relative icon
- in any other cases, the touchscreen might have been disabled, you can enable it again in the Home + Control App : go to settings, select ;Manage my home ;, select the room in which the thermostat is installed, select the thermostat and select ;Advanced ;, then you will be able to enable or disable the 'Touch' function.