Blue Wire In Thermostat
Blue "c" wire is connected to "y" on old thermostat. new thermostat has Thermostat wire color codes and conventions Thermostat wiring blue wire
Can't figure this 3 wire system out or find anything in postal about it
Wire blue thermostat connected installation extra old comments nest Can't figure this 3 wire system out or find anything in postal about it Installation: what's that extra blue wire connected to my old
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Blue common wire for continuous nest thermostat power : nest
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