Battery Replacement - Honeywell RTH3100C Operating Manual

Battery replacement

Pull at bottom to
remove thermostat
from wallplate.
Turn thermostat over,
insert fresh AA alkaline
batteries, then reinstall
thermostat.
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Batteries are optional if your ther-
mostat was wired for AC power
when installed. Install fresh batteries
immediately when the REPLACE BATT
warning begins flashing.
Even if the warning does not
appear, you should replace batteries
once a year, or before leaving home
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for more than a month.
Batteries provide backup power
to the display during power inter-
ruptions. All settings are perma-
nently stored in memory, and do not
require battery power.
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RTH3100C
69-2339EFS—01