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If the word BAT is flashing in the display
window, the battery is low and should be
replaced with a fresh 9 volt Energizer
®
alkaline battery. The battery will provide
power for all functions except the display
PARTS OF THE THERMOSTAT
The Back of the Thermostat Body
Turn the thermostat body over. On the back are
the 9 volt Energizer
®
alkaline battery and the
option switches.
1. The 9 volt Energizer
®
alkaline battery pro-
vides power to the thermostat when the
24 VAC power is interrupted (for example,
when you remove the thermostat from the
wall for programming). A fresh battery will
maintain the stored program for approxi-
mately one week. If power loss is long
enough for the program to be lost, the
thermostat will automatically maintain a fac-
tory preprogrammed heating temperature
of 64°F and a cooling temperature of 82°F
after power is restored. You must repro-
gram the thermostat if this happens.
BACK OF THERMOSTAT BODY
Option switches 9-pin connector
4-pin connector
Battery