5
Batteries are optional (to provide backup
power) if your thermostat is wired to run on
AC power. If your thermostat is 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 base plate.
Alerts
If there is an alert or reminder, the alert icon appears on the Home screen.
Number Alert/Reminder Definition
170 Internal Memory Error The memory of the thermostat has encountered an error.
Please replace the thermostat.
173 Thermostat Temperature
Sensor Error
The sensor of the thermostat has encountered an error.
Please replace the thermostat.
181 Replace Air Filter The set air filter replacement time has elapsed. Replace
the filter and clear the alert to reset the timer.
405 Low Battery Alert The batteries are getting low. Replace them within two
months.
407 Critical Low Battery The batteries are almost depleted and should be replaced
as soon as possible.
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