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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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Decoding Thermostat Wiring Colors: Essential Guide for DIY Installation
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How to identify a thermostat wire
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Thermostat Wire Color Code: Complete Information You Need to Know
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What does a thermostat C wire look like? - Quora
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