If you do not have a C-wire connected to your old thermostat, please
check below wiring diagram.
Check for spare wire behind your wall plate or old thermostat, if you have a spare wire, connect
it to the C terminal on the new wall plate.
Remove cover from furnace or heating system, open the heating and cooling system’s cover to
find the control board. You should see the same terminal labels that are on your thermostat.
Find the other end of the unused wire, locate the bundle of wire that are the same as the ones
at your thermostat.
Connect the unused wire to the C-terminal.
Close the cover to the furnace or heating system.
Do you have a spare wire? Yes.
1 .
2 .
3 .
4 .
5 .
G
C
R
W/E
Y
G
C
R
W/E
Y
c
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