If you are having problems with your Emerson Sensi Touch thermostat, here are a few troubleshooting tips: Make sure that the thermostat is turned on and set to a warm temperature. Check the electrical connections to make sure they are secure.  Make sure that the thermostat is connected to your home's WiFi network. Reset the thermostat by pressing and holding the reset button for 10 seconds.
If you have checked all of these things and your thermostat is still not working, you should contact Emerson customer support for assistance.