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Introduction

When replacing the auto-away sensor, battery removal is necessary. The battery replacement guide should be a prerequisite before starting. The tools required are tweezers and a Phillips #0 screwdriver.

What you need

Step 1 Removal from Wall

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Removal from Wall: step 1, image 1 of 2

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Removal from Wall: step 1, image 2 of 2

Grasp the display's metal outer ring with your fingers and pull directly away from the wall.

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Step 2 Open Display

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Open Display: step 2, image 1 of 1

Turn the display over.
Remove the four 6 mm screws from the back of the display using a Phillips #0 screwdriver.

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Step 3 Remove the back of the display

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove the back of the display: step 3, image 1 of 2

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove the back of the display: step 3, image 2 of 2

Pinch the gray 20-pin connector with your fingers and pull directly away from the display.
Do NOT pull too far as there is a ribbon on the back panel connecting the 20-pin connector to the display.

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Step 4 Disconnect the base connection ribbon cable.

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Disconnect the base connection ribbon cable.: step 4, image 1 of 3

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Disconnect the base connection ribbon cable.: step 4, image 2 of 3

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Disconnect the base connection ribbon cable.: step 4, image 3 of 3

Locate the blue pull tab at the end of the ribbon which says, "1. Pull".
Grasp the tab with your fingers and pull directly away from the motherboard.

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Step 5 Lift battery from the base

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Lift battery from the base: step 5, image 1 of 2

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Lift battery from the base: step 5, image 2 of 2

Tool used on this step:

Tweezers

$4.99

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Locate the blue tab which says, "2. Pull".
Use tweezers to pull the battery up and away from the display.
Do NOT pull too far, as the battery is still connected to the motherboard and must be unplugged.

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Step 6 Disconnect the battery from the motherboard

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Disconnect the battery from the motherboard: step 6, image 1 of 2

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Disconnect the battery from the motherboard: step 6, image 2 of 2

Locate the blue tab which says "3 unplug".
Grasp the battery with your fingers. Pull gently directly away from the display to unplug the battery from the motherboard.

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Step 7 Remove battery from the display

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove battery from the display: step 7, image 1 of 3

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove battery from the display: step 7, image 2 of 3

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove battery from the display: step 7, image 3 of 3

Grasp the battery with your fingers and pull directly away from motherboard to separate the battery from the display.

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Step 8 Locate auto-away sensor

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Locate auto-away sensor: step 8, image 1 of 1

Locate the auto-away sensor.

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Step 9 Remove screws

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove screws: step 9, image 1 of 2

Nest Learning Thermostat 2nd Generation Auto-Away Sensor Replacement, Remove screws: step 9, image 2 of 2

Remove the four 3mm screws with a #0 Phillips screwdriver.
Remove the one 4mm screw located at the edge of the auto-away sensor. Use a #0 Phillips screwdriver.

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