White Rodgers 1F92W-51 - Manual (Page 45)

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4. What happens if the electricity goes off or is
manually shut off?
If you have not installed a 9 volt alkaline battery,
the display will go blank and the program will be
lost in approximately one minute. When electric-
ity is restored, the thermostat will maintain a
heating temperature of 64
°
F and a cooling tem-
perature of 82
°
F until you reenter your program.
Setpoint temperature will not be displayed.
If a fresh 9 volt Energizer ® alkaline battery is
installed, the program will be maintained for
about one week with no 24 VAC power present
to the thermostat. 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. See 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 during
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 re-connect
the battery. The thermostat will revert to the
factory preset program until you re-program the
thermostat. If you don’t want to re-program the
thermostat immediately, press SYSTEM
HEAT-OFF-COOL-AUTO
until
OFF is displayed and replace the thermostat on