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Blue "C" wire is connected to "Y" on old thermostat. New thermostat has separate "C" hookup. Where does the blue wire go - "Y" or "C"? : r/Nest
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![Nest Thermostat Wire Colors [Explained] - YouTube](https://i.ytimg.com/vi/6uIobT86FdU/mqdefault.jpg "Nest Thermostat Wire Colors [Explained] - YouTube")
Nest Thermostat Wire Colors [Explained] - YouTube
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HVAC blue C wire on the circuit board : r/hvacadvice
The blue wire goes to the Y on thermostat. Instead of going to Y on HVAC it is connected to white wire that goes to AC? Why and do I connect both (
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Where does the blue wire on a thermostat go? - Quora
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