The display light and audio prompting (beep) only work when the thermostat is on the wall and 24 VAC power is present to the thermo- stat. These features will not work on battery power alone. See OPERATING YOUR THERMOSTAT.
9.The display is flashing BAT. What does this mean?
The 9 volt battery installed in the thermostat is low and should be replaced with a fresh 9 volt Energizer® alkaline battery. See OPER-
ATING YOUR THERMOSTAT.
10.Why won’t the system turn on, even though the thermostat display is func- tioning normally?
Either the compressor lockout feature is in operation or the thermostat is not currently calling for heat or cool. Wait about 5 minutes for the compressor lockout to expire. If the
system is still not running, read the following cautionary statement. Then, if conditions
permit, use the 
or 
buttons to move the temperature above or below the setpoint temperature. See OPERATING YOUR THERMOSTAT.
!CAUTION
If the outside temperature is below 50°F,
DO NOT use the 
button to move the temperature below the setpoint tempera- ture. Property damage may result due to compressor slugging.
11.Why doesn’t the temperature change at the time I programmed?
There may be a number of causes for this situation. The following are primary rea- sons.
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