Got a wifi thermostat. Behind the old thermostat was a blue wire. The other side of the blue wire in the equipment isn't plugged into anything. I need to get the 24v common hooked up to this blue but don't know where it goes. Any help is greatly appreciated.
Wiring – C wire – Where does it go
thermostatwiring
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Best Answer
You don't show where all the thermostat wires are connected in the unit, so I can't see how it's currently connected. But according to the schematic, the blue wire heading off to the left of the first photo is the
C
wire.