Operation Manual

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4. What happens if the electricity goes off or is
manually shut off?
If you have not installed a 9V alkaline battery,
the display will go blank and the program will be
lost in approximately one minute. When elec-
tricity is restored, the clock will reset itself to
12:00 PM (noon) and the thermostat will main-
tain a heating temperature of 64°F and a cooling
temperature of 82°F until you reenter your
program. Setpoint temperature will not be
displayed.
If a fresh 9V alkaline battery is installed, the
program will be maintained for about one week
with no 24VAC power present to the thermo-
stat. See OPERATING YOUR THERMOSTAT.
5. Why can’t I program the thermostat in the
AUTO mode?
The thermostat can only be programmed in the
HEAT and COOL modes. Please refer to sec-
tion PROGRAMMING YOUR THERMOSTAT.
6. What can cause the thermostat display to
freeze or go blank?
A completely blank display may indicate that
power has been lost to the thermostat and the
backup battery is also dead. However, if there
is power to the thermostat and the display is blank
or frozen, static discharge is probably the cause.
During periods of low humidity (especially dur-
ing cold weather), you may feel or see a spark
discharge when you touch the thermostat. This
may cause the program to be lost or the thermo-
stat to display incorrectly. To correct this, remove
the thermostat from the wall and disconnect the
battery. Wait about one minute, then reconnect
the battery. The thermostat will revert to the
factory preset program until you reprogram the
thermostat. If you don’t want to reprogram the
thermostat immediately, press
SYSTEM
SWITCH