How Nest Protect lets you know it's working

Google Nest Protect automatically runs a Self Test, where it checks its batteries and sensors every 200 seconds. Once a month, Nest Protect can also perform an automatic Sound Check to test its speaker and horn.

You can also run a full Safety Checkup anytime. This test lets you listen to your Nest Protect's speaker and horn, so you know your Nest Protects are working .

Smoke alarms are critical safety devices, and you need to know they're working, but according to the National Fire Protection Association, 9 out of 10 people don't test them as often as they should. That's why Nest Protect has two automatic tests: Self Test and Sound Check.

Self Test runs every 200 seconds, and checks:

  • Power
  • Smoke sensor
  • Carbon monoxide sensor
  • Wi-Fi

Learn about Self Test >

If enabled, Sound Check runs once a month, and verifies:

  • Speaker
  • Buzzer
  • Light ring

Learn about Nest Protect's automatic Sound Check test >

Once you've set up Nest Protect, there are three ways to see its

  • Check with the Nest app
  • Look for Nightly Promise when you turn out the lights
  • Run a Safety Checkup
Nest protect app everything ok image.


Check with the Nest app

The Nest app will show you the most recent information available about Nest Protect. Battery powered Nest Protects send information once a day, while wired 120V Nest Protects check in every 30 minutes.

If everything is fine, your Nest Protects will be green in the Nest app.

If there is a problem, the Nest app will show you what's wrong and tell you what to do, like get new batteries or replace your Nest Protect.

Accessing your Nest Protect from the Nest app or the Web >

Look for Nightly Promise

When you turn out the lights for the night, Nest Protect will glow green briefly to show you that its smoke and CO sensors are working, and that it has enough power, so it won't chirp in the middle of the night. We call this Nightly Promise.

If all Nest Protects in your home are connected, if one glows green, that means they're all fine (as long as they are running the latest software and are connected to your account in the Nest app).

If there's a problem with one of your Nest Protects, Nightly Promise will pulse yellow instead of green. Depending on the problem, Nest Protect may also speak up to tell you what's wrong.

Learn about Nightly Promise >

Run a Safety Checkup

The National Fire Protection Association recommends testing your alarms at least once a month. So, Safety Checkup helps you easily run a thorough test of all your Nest Protects, so you know they're all working and interconnected and so you can verify the horn and speaker for yourself. Running a Safety Checkup can also help you and your family become more familiar with the lights and sounds of Nest Protect, just in case of an actual alarm. Plus, you can run a Safety Checkup whenever you like, so you don't have to wait for a monthly Sound Check.

You can run a Safety Checkup with the Nest app for a 2nd generation Nest Protect, or press the Nest button on any Nest Protect. The test will take a few seconds to complete, and it will be loud.

At the end of Safety Checkup, the Nest app will let you know that everything is working or if there's a problem, like low batteries, a sensor failure, or if your alarm has expired.

Learn about Safety Checkup >

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