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Wiring New Honeywell RTH6580WF Thermostat with no Yellow Wire at Thermostat - Home Improvement Stack Exchange
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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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Why is the white wire not connected, and the yellow wire is joined to the white connection on my thermostat? : r/hvacadvice
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HVAC PROBLEM SOLVER
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Thermostat Wiring Explained! How To, Color Coding, Types & More
Furnace has C wire but no Y. Thermostat has Y but no C. How do install the PEK? : r/ecobee
Thermostat Wire Color Codes You Need to Know | AireServ
Thermostat Wire Color Codes You Need to Know | AireServ
4 Wire Thermostat Wiring Color Code — OneHourSmartHome.com
