Honeywell RTH2310 - Manual (Page 19)

RTH2310 Programmable Thermostat
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Set the System switch to Off before removing the batteries.
Otherwise, the heating/cooling system might remain activated even
when batteries are removed.
Install two fresh AA batteries when the low-battery icon flashes on the
screen. The icon will flash for 120 days, then the thermostat will cut power to
the heating/cooling unit. The icon disappears once the batteries are
replaced.
Replace batteries once a year or before leaving home for more than a month.
After replacing the batteries, set the time and the day (see page 7). The other settings are
not erased when the thermostat is without power.
Battery replacement
69-2229E_A.fm Page 17 Friday, February 19, 2010 10:12 AM