STEP 2. REMOVE OLD THERMOSTAT
Test to make certain that your heating and
cooling systems are working properly. If
either does not work, contact your local
heating/air conditioning dealer. To avoid
compressor damage, do not operate the
cooling system when outdoor temperature
is below 50°F (10°C).
Turn off power to system at the furnace, or
at the fuse/circuit breaker panel.
Carefully unpack your new thermostat and
wallplate; save package of screws,
instructions and receipt.
Remove the cover from the old thermo-
stat. If it does not snap off when pulled
firmly from the bottom, check for a screw
used to lock on the cover.
Loosen screws holding thermostat to
subbase, wallplate or wall, and lift away.
Disconnect wires from old thermostat or
subbase. As you disconnect each wire,
If there are
wires, they do not need to be labeled.
Wrap wires around pencil to keep them
from falling back into the wall, as shown.