No C Wire on Thermostat but Two C Wires on Furnace - Home - Wyze Forum
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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How to Install a Wifi Thermostat With or With Out C Wire : 5 Steps (with Pictures) - Instructables
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