2
Quick Installation Guide
Removing your old thermostat
2 Check that your system is off.
Change the temperature on your
old thermostat. If you don’t hear the
system turn on within 5 minutes, the
power is off.
Note: If you have a digital
thermostat that has a blank display,
skip this step
1 Turn power OFF.
To protect yourself and your
equipment, Turn off the power at the
breaker box or switch that controls
your heating/cooling system.
3 Remove the old thermostat’s
faceplate.
On most thermostats, you can take
off the faceplate by grasping and
gently pulling. Some thermostats
may have screws, buttons, or clasps.
Do not remove any wires from your
thermostat at this time!
75
OFF
OFF
ON
Breaker box
Switch
4 Make sure there are no 120/240V
wires.
Do you have thick black wires with
wire nuts?
Is your thermostat 120V or higher?
If you answered yes to either of
these questions, you have a line
voltage system and the thermostat
will not work.
If you are unsure visit:
yourhome.honeywell.com/support
Wire nut
Thick black wire
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