Replace Batteries; Battery Replacement - Honeywell RTHL2510 Owner's Manual

Battery replacement

Install two fresh AAA batteries when
Lo Batt flashes on the screen. Lo
Batt appears for 60 days before the
batteries are depleted.
Replace batteries once a year, or
when you will be away for more than a
month.
Most settings are stored in non-volatile
(permanent) memory. Only the clock
and the day must be set after you
replace the batteries.
Set the System switch to Off before removing
the batteries. Otherwise, the heating/cooling
system could remain activated even when
batteries are removed.
Turn thermostat over,
insert fresh AAA
alkaline batteries, then
reinstall thermostat.
16
Pull at bottom to remove
thermostat from wallplate.
W/ Not
Aux Used
Heat Off Cool
RTHXXXX
Fan
Auto On
M32705
M32707