3rd gen nest thermostat. Opened my sister and this yellow wire isn’t

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Thermostat wiring wire heat color diagram guide pump air nest goodman colors honeywell common conditioner code heater handler wires carrier Thermostat wiring color code [decoded and explained] 3rd gen nest thermostat. opened my sister and this yellow wire isn’t

Thermostat Wiring Color Code [Decoded and Explained] - YouTube

5 wire thermostat wiring diagram
Thermostat Wiring Color Code [Decoded and Explained] - YouTube
Thermostat Wiring Color Code [Decoded and Explained] - YouTube

5 Wire Thermostat Wiring Diagram - Cadician's Blog
5 Wire Thermostat Wiring Diagram - Cadician's Blog

3rd gen nest thermostat. Opened my sister and this yellow wire isn’t
3rd gen nest thermostat. Opened my sister and this yellow wire isn’t