Press the Minus button.
The modes are HEAT, COOL, AUTO, EMER, and OFF.
The thermostat will only show the modes that are available based on the system configuration.
When in EMER mode, the thermostat will flash EMER when the display wakes up, and it will show HEAT at the top of the screen. Changing the mode will leave EMER mode.
Select the desired mode.
Once in the desired mode, press the Up and Down buttons to adjust the desired setpoint.
In AUTO mode when the system is idle, the screen will display AUTO. The thermostat will display HEATING when calling for heat and COOLING when calling for cool.