Introduction
Replacing the base plate for your Nest couldn't be easier. The only tool required is a Phillips #2 screwdriver
Tools
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Grasp the display's outer ring with your fingers and pull directly away while rotating clockwise to remove the thermostat from the wall.
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Go to the electrical panel and turn off the circuit to make sure no power is running to the thermostat.
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Once the power is off, disconnect the Y1, G, R, W1, C, and OB wires.
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Remove the two 1 ¼” drywall screws holding the base display and base plate in the wall using a Phillips #2 screwdriver.
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Remove the base plate and base display.
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Conclusion
To reassemble your device, follow these instructions in reverse order.