How Nest Protect lets you know it's working

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 siren. And you can run a full Safety Check-Up at any time so you know your Nest Protects are interconnected and so you can listen to the speaker and siren for yourself.

Smoke alarms are critical safety devices, and you need to know that they're working, but according to the US National Fire Protection Association, nine out of ten 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 the following:

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

Learn about Self Test >

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

  • 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 Check-Up
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 120 V 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 the CO sensors are working, and that it has enough power so that it won't start chirping in the middle of the night. We call this Nightly Promise.

If all Nest Protects in your home are connected and one of them glows green, this means that 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 Check-Up

The US National Fire Protection Association recommends testing your alarms at least once a month. Safety Check-Up helps you easily run a thorough test of all your Nest Protects so that you know they're all working and interconnected, and you can verify the siren and speaker for yourself. Running a Safety Check-Up 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. What's more, you can run a Safety Check-Up whenever you like, so you don't have to wait for a monthly Sound Check.

You can run a Safety Check-Up via 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 the Safety Check-Up, the Nest app will let you know that everything is working fine or if there's a problem, such as low batteries, a sensor failure or if your alarm has expired.

Learn about Safety Check-Up >

Was this helpful?
How can we improve it?