Other than 
and 
, the buttons are located behind the thermostat door. To open the door, use your fingernail in the indentation at the top center of the door. Pull the door out, then swing the door down on its hinges.
Following are brief descriptions of the display and the thermostat buttons.
The Display
1Continuously displays system mode (HEAT, OFF, COOL, AUTO, HOLD). During pro- gramming, the program period is displayed (MOR, DAY, EVE, NHT).
2Alternately displays room temperature (F denotes degrees Fahrenheit and C de- notes degrees Celsius) and time of day (A denotes AM time and P denotes PM time).
3Displays the setpoint temperature.
45 DAY indicates that the displayed program is the weekday program. 2 DAY indicates that the displayed program is the weekend program.
5The word BAT flashes on the display when the 9 volt alkaline battery is weak and should be replaced.
6FAN 
is displayed when the blower is operating continuously, regardless of heat- ing or cooling system cycling. FAN 
is displayed during automatic fan operation (when the blower cycles with the heating or cooling system).
8