Nest Protect Wired User's Guide
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2
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2. Twist Nest Protect counterclockwise until  
it disconnects from the backplate.
3. Detach the power connector 
from the back of Nest Protect 
and open the battery door.
4. Replace the batteries. 
Align the + positive and 
- negative ends with the 
markings in the battery 
compartment.
5. Close the battery compartment. 
Do not force the door closed.
6. Reattach the power connector. 
7. Push Nest Protect onto the backplate and  
turn it clockwise until you feel it grip.
8. Turn power to Nest Protect back on at the 
breaker box.
9. Press the Nest button twice.
SERVICING
1. Before sending Nest Protect for service, 
visit nest.com/support
2. If your Nest Protect needs servicing, 
first contact our support team to get 
a return number
3. Send your Nest Protect to:
Nest Labs
(YOUR RETURN NUMBER)
4 East Stow Road
Marlton, NJ 08053 USA
GENERAL MAINTENANCE
CLEANING YOUR NEST PROTECT
Nest Protect has been designed to be as 
maintenance free as possible, but you should 
keep it clean. As with any smoke alarm, 
dust buildup on the outside or inside of Nest 
Protect can stop it from working properly.
To clean Nest Protect:
1. Turn off power to Nest Protect at the 
breaker box (see p.9)
2. Remove it from the wall or the ceiling (turn 
counterclockwise until it comes off the 
backplate and detach the power connector).
3. Wipe the outside with a clean, slightly 
damp cloth. Don’t use any soaps or solvents.
4. Place Nest Protect on a soft, dry cloth with 
the Nest button facing down. Open the 
battery compartment door and remove the 
batteries. Remove the screws and lift off 
the back. Be careful to not lose the screws.
5. Gently vacuum the inside. Make sure  
to clean all the way around the mesh  
sides of the smoke chamber (the large 
metal circle). 
Note: Never use detergents or solvents (like 
glass cleaner) on your Nest Protect and do 
not spray air fresheners, hair spray or other 
aerosols near it. Do not get water inside the 
alarm or paint over it.
REPLACING THE BACKUP BATTERIES
In case of a power outage, Nest Protect will 
use three AA Energizer® Ultimate Lithium 
batteries (L91) for backup. These batteries 
can be purchased at your local retailer.
1. Turn off power to Nest Protect at the 
breaker box (see p.9) 
 WARNING
• Use only batteries specified by Nest. 
Use of a different battery model will 
have a detrimental effect on the smoke 
alarm operation. 
• Never disconnect a wired alarm to stop 
an unwanted alarm (caused by cooking 
smoke, etc.) Removing power disables the 
alarm so it cannot sense smoke or carbon 
monoxide (CO). Instead open a window or 
fan the smoke away from the unit.
• The batteries cannot work until you install 
the batteries in the correct position 
(Match + to + and - to -).
• Once Nest Protect has expired you’ll no 
longer be protected from smoke or CO if 
you don’t replace it.
GENERAL MAINTENANCE
YELLOW pulses. Low battery. Change the batteries 
of Nest Protect now.
“THE BATTERY IS LOW IN  
THE [ROOM NAME].  
REPLACE THE BATTERY 
NOW.” Single chirp  
every 60 seconds.
Nest Protect has tested 
its sensors and there is 
a problem.
Clean according to 
instructions on page 20.  
If the problem persists, 
replace Nest Protect.
“THE SENSORS HAVE 
FAILED IN THE [ROOM 
NAME]. REPLACE NEST 
PROTECT NOW.” Single 
chirp every 60 seconds.
Nest Protect has expired 
and reached the end of 
its life.
Replace Nest Protect now.
“NEST PROTECT HAS 
EXPIRED. REPLACE IT 
NOW.” Two chirps every  
60 seconds.
There’s a problem with 
the horn of Nest Protect.
Replace Nest Protect now.
“NEST PROTECT CAN’T 
SOUND THE ALARM IN 
THE [ROOM NAME].”Two 
chirps every 60 seconds.
YELLOW pulses. Change the batteries 
of Nest Protect soon.
Low battery.
“THE BATTERY IS LOW IN  
THE [ROOM NAME].
REPLACE THE BATTERY 
SOON.”
YELLOW pulses.
YELLOW pulses.
WHAT YOU HEAR WHAT IT MEANS WHAT TO DOWHAT YOU SEE
GENERAL MAINTENANCE
YELLOW pulses.










