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Operating Manual
10
Batteries are optional (to provide backup
power) if your thermostat was wired to run on
AC power when installed.
Install fresh batteries immediately when the
REPLACE BATTERY warning begins flashing. The
warning flashes about two months before the
batteries are depleted.
Even if the warning does not appear, you
should replace batteries once a year, or before
leaving home for more than a month.
Batteries provide backup power to the display
during power interruptions. All settings are
permanently stored in memory, and do not
require battery power.
Battery replacement
Replace Batttery
Press and pull to remove
Insert fresh alkaline batteries,
then reinstall battery holder.
TH5110D – AAA alkaline
batteries.
TH5220D – AA alkaline
batteries.