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Batteries are optional (to provide backup 
power) if your thermostat was wired to run on 
AC power when installed. If your thermostat 
was not wired to run on AC power, then 
batteries are required.
Install fresh batteries immediately when the 
low battery icon appears. The icon appears 
about two months before the batteries are 
depleted.
Even if the low battery icon does not appear, 
you should replace batteries once a year, or 
before leaving home for more than a month.
If batteries are inserted within two minutes, the 
time and day will not have to be reset. All other 
settings are permanently stored in memory, 
and do not require battery power.
NOTE: When replacing batteries, alkaline 
batteries are recommended. 
Battery replacement
Insert fresh alkaline AA 
batteries and reinstall 
thermostat.
When the low battery 
warning appears, press 
gently to loosen the 
thermostat and then 
carefully pull it from the 
wall mount.
Alerts
If there is an alert or reminder, the alert icon 
 appears on the Home screen.
Low Battery Warning
1  The batteries need to be replaced when 
BATT, the alert icon 
, and the battery icon 
are displayed on the Home screen.
2  When the battery power is very low, the 
thermostat’s backlight is disabled to save 
battery power.
3  When battery power is critically low, only 
BATT, the alert icon 
, and the battery icon 
are displayed. 
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