Google Nest Protect tests itself to make sure that its batteries, sensors, speaker, horn, and Wi-Fi connection are working. You’ll have the results in the Nest app 
Learn more about Nightly Promise.
What Self Test checks
There are few differences between the 1st and 2nd generation Nest Protects. Only the 2nd gen Protects can check their speaker and horn. Nest Protect's Self Test automatically tests the following:
- Sensors: Smoke, carbon monoxide
- Audio: Speaker and horn (2nd gen Nest Protect only). Learn more about Automatic Sound Check test
- Power: Battery charge (including backup batteries for wired Nest Protect) and 120V or 230V (depending on your region) line power connection for wired Nest Protect
- Wi-Fi connection: So you can receive alerts and notifications on your phone
Note: Wi-Fi connectivity can vary over the course of the day because of wireless interference, service interruptions and other factors. To avoid sending you repetitive notifications when your internet connection is spotty, Nest Protect shows you it's offline after 48 hours of no internet connection. Nightly Promise glows yellow, and you'll have the information in the Nest or Home app.
The 2nd generation Nest Protect also runs a Sound Check once a month to test its speaker and horn even, if you’re not at home to run the test.
How to check Self Test resultsYour Nest Protect lets you know Self Test's results during Nightly Promise. If Self Test finds a problem with any of your Nest Protects, such as a low battery, all Nest Protects in your home lets you know during Nightly Promise. When you turn off the lights, Nest Protect's light glows green to show you that everything's okay. It glows yellow if there's a problem even when the setting is off. To hear what's wrong, you can press the Nest button. Learn more on what the lights and sounds mean on Nest Protect. You can also check it in the Nest or Home app. This shows the time and results of the last test.
If there's an issue, you can check what happened in History of the Nest app or Activity |
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Can I turn off Self Test
Self Test helps ensure that your Nest Protect is working to keep you safe, and gives you essential information when you need it, so it can't be disabled. However, you can disable Nightly Promise at any time in the Nest app
If you do this, your Nest Protect's light ring won't glow when you turn off the lights to let you know if everything is OK or if there's a problem. Here's how:
On the Nest app
On the Google Home app
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in the top right corner of the screen.