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Battery replacement
The Nest app will notify you when a Detect’s battery
gets low . Remove the battery and replace it with
another Energizer CR123 or Panasonic CR123A 3V
lithium battery .
To open the battery compartment:
• If Nest Detect is mounted to a surface, grip the top
and pull it firmly toward you .
• If Nest Detect is not mounted to a surface, use a
flathead screwdriver to pry off the backplate .
Troubleshooting offline issues
If one or more Detects are listed as offline in the Nest
app after installation, they may be too far from Guard
to connect . You can install a Nest Connect (sold
separately) to bridge the gap, or try moving your Detects
and Guard closer together .
False alarms
The following may cause unintended alarms:
• Pets that walk, climb or fly above 3 feet (1 m)
• Pets heavier than 40 pounds (18 kg)
• Heat sources like electric heaters, heat vents
and fireplaces
• Cold sources like drafty windows, air conditioners
and AC vents
• Curtains near windows that may move while Nest
Guard is armed
• Direct sun exposure: the front of Nest Guard and
Nest Detect should not be placed in direct sunlight
• Party balloons left unattended: they may drift into
the field of view of your sensors
• Insects that may come very close to the sensor
• Vibration or movement caused by pets bumping
Nest Guard when it’s set to Away and Guarding
• Wireless access points within 6 feet (2 m) of
Nest Detect .