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Nest Protect lights and sounds

Google 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 are saved in the Nest app in Messages. If you ever need to review them, just click or tap on the Messages icon messages icon in the Nest app home screen.

Here’s what Protect's lights and messages mean, and what you should do.

Note: You might notice that the voice of your Nest Protect has changed. This is working as intended. There was a recent software update that updated your Nest Protect’s voice.

During setup

Protect will guide you through the setup process using its blue light ring and voice.
Protect speech and sounds Protect lights What it means What to do

"Hi."

Listen to it now

Pulsing blue light ring

Nest protect glow blue image.

Nest Protect is ready for setup.

Protect will walk you through the setup steps.

How to install Nest Protect

Manually test Nest Protect

Protect speech and sounds Protect lights What it means What to do

"Press to test."

Listen to it now

Pulsing blue light ring

Nest protect glow blue image.

After you press the center button, Protect pulses blue to indicate that it will test its sensors, batteries, Wi-Fi connection and interconnection with other Protects.

2nd gen Nest Protects will also run Sound Check on their horn and speaker. Protect will run one horn cycle for smoke and 2 horn cycles for carbon monoxide.

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

How to test Nest Protect

Heads-Up and Emergency Alarms

Protect uses its voice to let you know about potential danger and where in your home it’s located. Nest Protect first gives you an early warning when it detects low levels of smoke or carbon monoxide. This is what we call Heads-Up. If the smoke or carbon monoxide levels are increasing to dangerous levels, Nest Protect will sound the alarm, pulse red and let you know where the problem is.

Protect speech and sounds Protect lights What it means What to do
“Please be aware, there’s smoke in the (room name). The alarm may sound.”

Pulsing yellow light ring

protect 2nd gen yellow ring

Smoke levels are rising. Put out the source of the smoke. Then, use the app or press the center button to silence the alert.
“Please be aware, there’s carbon monoxide in the (room name). The alarm may sound.”

Pulsing yellow light ring

protect 2nd gen yellow ring

Carbon monoxide levels are rising.

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

"(Smoke or carbon monoxide) alarm silenced in the (room name)".

Pulsing yellow light ring

protect 2nd gen yellow ring

You have silenced the alarm temporarily. 

Note: In some cases, alarm silencing isn't possible when carbon monoxide reach very high levels.

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

(Alarm sound) "Emergency. There's smoke in the (room name)."

Listen to it now

Pulsing red light ring

Nest Protect with pulsing red ring

The smoke in the room has reached emergency levels.

Note: Only the alarm that originally detected emergency levels of smoke will have light ring turn red.

Get out of the house immediately. 

What to do if Nest Protect detects smoke

(Alarm sound) "Emergency. There's carbon monoxide in the (room name). Move to fresh air."

Listen to it now

Pulsing red light ring

Nest Protect with pulsing red ring

The carbon monoxide in the room has now reached emergency levels.

Note: Only the alarm that originally detected emergency levels of carbon monoxide will have light ring turn red.

What to do if carbon monoxide is detected

  1. Keep calm and open all doors and windows.
  2. Stop using all fuel-burning appliances.
  3. Evacuate the premises.
  4. Contact your emergency services.

“Nest Protect has been hushed.”

Pulsing red light ring

Nest Protect with pulsing red ring

You have silenced the alarm temporarily.

Note: In some cases, alarm silencing isn't possible when carbon monoxide reach very high levels.

What to do in case of a smoke alarm

What to do in case of a carbon monoxide alarm

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

Pulsing green light ring

Nest protect with pulsing green ring

Conditions are returning to normal.

 

“Carbon monoxide is clearing in the (room name).”

Pulsing green light ring

Nest protect with pulsing green ring

Conditions are returning to normal.

 

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

Note: 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 Protect will not speak a room name.

Learn more about Nest Protect names and labels

Nest Protect needs your attention

If a problem has been identified during Self Test, Protect uses its yellow light to communicate that it requires your attention. As with Heads-Up and Emergency Alarms, 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 Protect is about to expire.

Battery chirps and expiration chirps

Protect will continuously chirp when its batteries are critically low and when it has expired. This acts as a reminder for you to take action (and is required in order to comply with safety regulations). In both of these situations, Protect will chirp continuously until the issue has been taken care of. However, it uses different chirp patterns depending on what’s going on.

  • Low battery: Protect will sound one chirp every 60 seconds until you replace the batteries.
    • To stop the chirping, you need to replace the batteries with Energizer Ultimate Lithium AA (L91) batteries.
  • Protect has expired: Just like any electrical appliance, smoke and carbon monoxide alarms wear out over time and expire. Protect will sound a double chirp once a minute. You won’t be protected from smoke or carbon monoxide if you don't replace your Protect when it expires.
    • Note: Protect will let you know it's going to expire a few months before the expiration date. You’ll receive a series of messages during that time to remind you to replace it. 
Protect speech and sounds Protect lights What it means What to do

"The batteries are low in the (room name). Replace the batteries soon."

Listen to it now

Pulsing yellow light ring

protect 2nd gen yellow ring

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

Replace Nest Protect batteries soon.

Learn more

"The batteries are very low in the (room name). Replace the batteries now."

Single chirp every 60 seconds.

Listen to it now

Pulsing yellow light ring

protect 2nd gen yellow ring

Nest Protect batteries have been depleted. It will chirp.

Replace Nest Protect batteries now.

Learn more

"The sensors have failed in the (room name). Replace Protect now."

Single chirp every 60 seconds.

Listen to it now

Pulsing yellow light ring

protect 2nd gen yellow ring

Nest Protect has tested its sensors and a problem has been detected.

Replace Nest Protect now.

When to replace your Nest Protect

"Nest Protect has expired in the (room name). Replace Nest Protect now."

2 chirps every 60 seconds.

Listen to it now

Pulsing yellow light ring

protect 2nd gen yellow ring

Nest Protect has expired and reached its end of life.

Replace your Nest Protect now.

When to replace your Nest Protect

"Nest Protect is offline in the (room name)."

Pulsing yellow light ring

protect 2nd gen yellow ring

Nest Protect is longer connected to the Internet.

Check your Wi-Fi connection at home to ensure it is working.

Check the Nest app to ensure that all your Nest Protects appear.

 

Solid green power light

  Nest Protect is receiving power from line voltage.
"The power is out in the (room name)."

Blinking green power light

Nest Protect’s wired power is out. Protect is receiving power from battery. Troubleshoot Nest Protect power problems

"The sensors have failed."

Listen to it now

No lights

There is a problem with the light ring.

Protect's light ring no longer works.

Replace your Protect now.

When to replace your Nest Protect

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