Thermostat Wire Color Coding

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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

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Thermostat Wire Colors 5 Wire

Thermostat Wire Colors 5 Wire

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

Can't figure this 3 wire system out or find anything in postal about it

Can't figure this 3 wire system out or find anything in postal about it

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