If C-wire does not exist in your system, check the instruction below:
Check for the spare wire behind your wall plate or old thermostat, if there's one, connect it to the C-terminal of
the new wall plate.
Remove the cover of the furnace or heating system, open the cover of the heating/cooling system to find the
control board where you should find the same terminal labels as of the thermostat.
Find the other end of the spare wire, locate the bundle of wire with the same labels as that of your thermostat
end.
Connect the spare wire to the C-terminal.
Close the cover of the furnace or heating system.
Do you have a spare wire? Yes.
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C
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Y
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