User's Guide

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7. Remove the old back plate
Unscrew the back plate from the ceiling or
dry lining box. Save the screws for installing
the Nest back plate later. You’ll see one or
two cables coming from the ceiling.
6. Remove your old smoke alarm
To prevent electric shock, make sure that the
green power light is off on the alarm. You may
have to twist the alarm to release it. Remove it
carefully to avoid damaging your ceiling or wall.
There will be two or four wires attached to the
old back plate. Disconnect them all.
Tip: Your old smoke alarm might make a loud noise
when you disconnect it.