The lock icon on the 4iE Smart Thermostat represents that the thermostat has gone into standby mode. It will show at the bottom center of your thermostat.
Controlled from a smartphone, tablet or computer, the 4iE Smart WiFi Thermostat learns how you use your heating and the unique way your house reacts. Download MyHeating app on the app store or connect to the web portal my.warmup.com. Comes with a 3-Year warranty. For the portrait manual, click here.