Honeywell CT2095 - Manual (Page 10)

10 69-1385
Press down on the left ends of batteries to
remove them. If you insert the new batteries
within 20 to 30 seconds of removing the old
ones, you do not need to reprogram the
thermostat. However, if the display is blank, the
batteries are dead or incorrectly installed and
you must reprogram. See Step 4. IMPORTANT
Although the thermostat has a low bat-
tery indicator, replace the batteries
once a year to prevent the thermostat
and heating/cooling system from shut-
ting down due to lack of battery power.
As a precaution, when leaving home
for longer than a month, change bat-
teries before you leave to prevent the
system from shutting down due to lack
of battery power.