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Furnace has C wire but no Y. Thermostat has Y but no C. How do install the PEK? : r/ecobee
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Am I compatible? There is also an addition yellow wire hidden in the back. Can't find anything referencing 1-4 like this. : r/ecobee
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Why is the white wire not connected, and the yellow wire is joined to the white connection on my thermostat? : r/hvacadvice
Nest installation - Missing Yellow (Y) wire on thermostat : r/Nest
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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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