9 69-1532—2
❑When the batteries are running low, a REPL BAT message flashes for one
to two months before the batteries run out completely. Replace the
batteries as soon as possible once the message flashes.
IMPORTANT
Although the thermostat has a low battery indicator, replace the
batteries once per year to prevent leakage and to prevent the ther-
mostat and heating/cooling system from shutting down due to lack
of battery power in the thermostat.
❑If you insert new batteries within 20 to 30 seconds of removing the old
batteries, the system retains the current time and day. If the display is
blank, the batteries are dead or installed incorrectly. You must reset the
time and day. Refer to Step 9. Set the Clock for instructions.
As a precaution when leaving home for longer than a month,
change batteries before leaving to prevent the system from
shutting down due to lack of power. Always use fresh alkaline
batteries. Nonalkaline batteries do not last as long and can
leak, causing damage to the thermostat and the wall surface.
STEP 6. SET FAN OPERATION SWITCH
The thermostat fan operation switch, labeled FUEL SWITCH, is factory
set in the F position. This is the correct setting for most systems. If your
system is an electric heat system, set the switch to E. The E setting
allows the fan to turn on immediately with the heating and cooling in a
system where the G terminal is connected.
M16424
80
90
70
60
90
80
70
60
M1267
6
FUEL SWITCH