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RTH7400/RTH7500
Battery replacement
Grasp thermostat and pull
to remove from wallplate
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
warning begins flashing. The warning
B B A A T T T T
flashes about 30 days before 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.
Insert 2 fresh AA alkaline batteries
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