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Step 3: Install Batteries
IMPORTANT
Batteries must be installed for
programming and operation of the
thermostat and heating/cooling
system.
■■ Purchase two AA alkaline batteries; non-
alkaline batteries do not last as long, and
can leak, causing damage to the thermostat
or the wall surface. We recommend
Energizer® batteries.
■■ Make sure the thermostat is set to the OFF
position.
■■ Use a coin to remove the battery door.
■■ Install the fresh batteries as shown, making
sure positive and negative terminals are
oriented correctly.
■■ Replace the battery door.
As the batteries are running low, a
bAt Lo
indicator flashes for one or two months before
batteries run out completely. Replace the
batteries as soon as possible after the indicator
starts flashing. If you do not replace the
batteries sometime while
bAt Lo
is flashing, the
M1719C
REMOVING
BATTERY
DOOR