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Blue "C" wire is connected to "Y" on old thermostat. New thermostat has
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Simple thermostat wiring guide (2,3,4,5,6,7,8 wires color code)Blue "c" wire is connected to "y" on old thermostat. new thermostat has Ceiling cable heat thermostatsWhere to connect c wire on furnace.
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Old thermostat has an unused blue wire, should I use it for Nest 3rd
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