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The "C" or Common wire provides a way to get constant 24VAC power to the thermostat, now required by many newer thermostats with WiFi and/or touchscreens.
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Wifi Thermostat C Wire Help
The initial picture showing that I connected into the other blue nut was correct. The unit had a button that had to be pressed in to ensure that the cover was on. DOH!!!!
1
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1
answer
371
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Wifi Thermostat C Wire Help
Looking to hookup a wifi (smart) thermostat that requires common constant low voltage power. The hookup of the old thermostat didn't use the blue wire as it was shoved into the wall but I traced it u …
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2
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"C" wire in wall! Where does it go in air handler/furnace?
Got a wifi thermostat. Behind the old thermostat was a blue "C" wire. The other side of the blue wire in the equipment room isn't plugged into anything. I need to get the 24v common hooked up to this …