Learn what the lights and sounds on the Nest Protect mean

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Nest Protect uses its light ring and voice to help you better understand what’s going on. You’ll see it light up and speak during setup, when there’s smoke or carbon monoxide, or when something requires your attention, such as low batteries.

When it comes to your safety, sometimes you need more than just a beep or loud siren. Nest Protect speaks and lights up so you don’t have to guess what it’s trying to tell you. You’ll also get an alert on your phone or tablet (as long as your Protect has a working Wi-Fi connection). Alerts will also be saved in the Nest app in Messages. If you ever need to review them, just click or tap on the Messages icon in the Nest app home screen.

The table below shows you what you can expect to see and hear from your Nest Protect, what the lights and messages mean, and what you should do when you see and hear them.

During setup

Nest Protect will guide you through the setup process using its blue light ring and voice.

WHAT YOU HEAR WHAT YOU SEE ON NEST PROTECT WHAT IT MEANS WHAT TO DO

“Hi from Nest.”

Blue pulses

Nest Protect is ready for setup.

Nest Protect will walk you through the setup steps.

Manually testing Nest Protect

WHAT YOU HEAR WHAT YOU SEE ON NEST PROTECT WHAT IT MEANS WHAT TO DO
“Press to Test.” Blue pulses

After you press the Nest button, Nest Protect pulses blue to indicate that it will test its sensors, batteries, Wi-Fi connection and interconnection with other Nest Protects. 2nd gen Nest Protects will also run Sound Check on their horn and speaker.

Nest Protect will tell you when the test is complete and what the results of the test were.

Heads-Up and Emergency Alarms

Nest Protect uses its voice to let you know about potential danger and where in your home it’s located. It will also send an alert to your phone or tablet as long as it is connected to Wi-Fi and the Internet.

Nest Protect first gives you an early warning when it detects that smoke or carbon monoxide levels are rising. This is what we call Heads-Up. If the smoke or carbon monoxide levels are at critical levels, Nest Protect will sound the alarm, pulse red and let you know where the problem is.

WHAT YOU HEAR WHAT YOU SEE ON NEST PROTECT WHAT YOU SEE ON YOUR MOBILE DEVICE WHAT IT MEANS AND WHAT TO DO

“Heads-Up. There’s smoke in the (room name). The alarm may sound.”

Yellow pulses

Heads-Up: There’s smoke (room name) Smoke levels are rising.

Put out the source of the smoke. Then use the Nest app or press the Nest button to silence the alert.

“Heads-Up. There’s carbon monoxide in the (room name). The alarm may sound.”

Yellow pulses

Heads-Up: There’s carbon monoxide (room name)

Carbon monoxide levels are rising.

Open a window or door to get some fresh air. Then use the Nest app or press the Nest button to silence the alert.

“(Smoke or carbon monoxide) alarm silenced.”

Yellow pulses

Alarm silenced. The alarm will sound again if the problem continues.

You have silenced the alarm temporarily.

Make sure you are safe and put out the source of the smoke or carbon monoxide.

(Alarm Sound) “Emergency. There’s smoke in the (room name).”

Red pulses

Emergency: There’s smoke • (room name)

 

The smoke in the room has reached emergency levels.

Get out of the house immediately.

 

(Alarm Sound) “Emergency. There’s carbon monoxide in the (room name). Move to fresh air.”

Red pulses

Emergency: There’s carbon monoxide • (room name) The carbon monoxide in the room has now reached emergency levels.

Press the Nest button to silence/reset Nest Protect.
Call your fire department or 911. Move everyone to fresh air. Do not re-enter the premises until the emergency services tell you to.

“(Smoke or carbon monoxide) alarm silenced.”

Red pulses

Alarm silenced. The alarm will sound again if the problem continues.

You have silenced the alarm temporarily.

“The smoke alarm is over in the (room name).”

Green pulses

Smoke clearing • (room name) The smoke level is decreasing.

Conditions are returning to normal.

Make sure you’re safe and have put out the source of smoke.

“The carbon monoxide alarm is over in the (room name).” Green pulses

Carbon monoxide clearing • (room name) The carbon monoxide level is decreasing.

Conditions are returning to normal.

Make sure you’re safe and have dealt with the source of the carbon monoxide.

Disclaimer: In Australia, the light ring may illuminate only on the Protect that detects smoke or carbon monoxide, but interconnected Protects will still sound an alarm.

Note: Nest Protect will only speak the room name if you selected one of the standard names from the list during setup, or if you chose a standard name and added a custom label. If you use a custom name, your Nest Protect will not speak a room name.

When Nest Protect needs your attention

If a problem has been identified during Self Test, Nest Protect uses its yellow light to communicate that it requires your attention. As with Heads-Up and Emergency Alarms, Nest Protect will also send an alert to your phone or tablet as long as it’s connected to Wi-Fi and the Internet. It may be that its batteries are getting low, its sensors have failed or Nest Protect is about to expire.

WHAT YOU HEAR WHAT YOU SEE ON NEST PROTECT WHAT YOU SEE ON YOUR MOBILE DEVICE WHAT IT MEANS AND WHAT TO DO

“The battery is low in the (room name). Replace the battery soon.”

Yellow pulses

Low battery (home name: Protect location).

The battery is low. Replace the battery soon.

Your Nest Protect will need new batteries in the coming months.

Nest Protect batteries (or backup batteries for Nest Protect Wired) are low.

Replace Nest Protect batteries soon.

“The battery is very low in the (room name). Replace the battery now.” Single chirp every 30 seconds. Yellow pulses

Replace the battery now. (home name: Protect location).

Your Nest Protect needs new batteries immediately. Only a few days of battery life remain.

Nest Protect will start chirping soon — day and night.

Nest Protect batteries are very low. It will chirp.

Replace Nest Protect batteries now.

“The sensors have failed in the (room name). Replace Nest Protect now.”

Yellow pulses

Smoke sensor failure (home name: Protect location).

The Nest Protect’s smoke sensor has failed.

 

Nest Protect has tested its smoke sensor and a problem has been detected.

Clean your Nest Protect according to the instructions.

If the problem persists, replace it.

“The sensors have failed in the (room name). Replace Nest Protect now.”

Yellow pulses

Carbon monoxide sensor failure (home name: Protect location).

The Nest Protect’s carbon monoxide sensor has failed.

You need to replace Nest Protect.

Nest Protect has tested its CO sensor and a problem has been detected.

Replace your Nest Protect now.

“Nest Protect has expired. Replace Nest Protect now.”

Two chirps every 60 seconds.

Yellow pulses

Nest Protect has expired.

Replace your Nest Protect now.

“Nest Protect is disconnected from the Internet.”

Yellow pulses

Nest Protect is offline.

Nest Protect is no longer connected to the Internet.

Check your Wi-Fi network and Internet connection.

“The sensors have failed.”

No lights There is a problem with the light ring.

Nest Protect’s light ring no longer works.

Replace your Nest Protect now.