Thermostat wiring color code decoded - YouTube
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Amazon.com: C Wire Accessory Common Wire Kit for Most 24 VAC Thermostats (4 to 5 Wires), White (1 Pack) : Tools & Home Improvement
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![Thermostat Wiring Color Code [Decoded and Explained] - YouTube](https://i.ytimg.com/vi/FmaDeTcgkUg/hqdefault.jpg "Thermostat Wiring Color Code [Decoded and Explained] - YouTube")
Thermostat Wiring Color Code [Decoded and Explained] - YouTube
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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
