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

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

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

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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

Thermostat Wiring to a Furnace and AC Unit! Color Code, How it Works
Thermostat Wiring to a Furnace and AC Unit! Color Code, How it Works

Heater Thermostat Wiring Color Code
Heater Thermostat Wiring Color Code

Furnace Wiring Code - Ac Thermostat Wiring Color Code Gfi Plug Wiring
Furnace Wiring Code - Ac Thermostat Wiring Color Code Gfi Plug Wiring