The 2nd gen Google Nest Protect has a built-in microphone that checks its own speaker and horn during Sound Check and Safety Checkup tests. If Nest Protect can’t verify that its speaker and/or horn are working, run a Safety Checkup to make sure you can hear the alarm for yourself.
During each automatic monthly Sound Check or manual Safety Checkup test, Nest Protect uses its speaker and horn to make a short sound, and then uses its microphone to listen for that sound. Play Sound Check audio
If the microphone hears the exact sound that it expects to hear, Nest Protect will know its speaker and horn are working properly, and it’ll reflect in the Nest app or Google Home app.
There are instances where the microphone can’t verify the functionality of the speaker and horn, but this doesn't necessarily mean they're broken. This might indicate an issue during the test where Nest Protect did not detect the anticipated sound. For example, there might’ve been a loud noise at the same time as the test, such as a door slamming or a TV playing with the volume turned up.
What to do if Nest Protect couldn't verify the speaker or horn
If Nest Protect can't automatically verify the speaker or horn, the Nest app or Home app lets you know, and Nest Protect glows yellow during Nightly Promise. Run a manual Safety Checkup with the Nest app, the Home app, or double-press the Nest button and listen for Nest Protect to sound. Learn more about Safety Checkup.
Before the Safety Checkup test begins:
- Make sure Nest Protect is installed properly on the wall or ceiling.
- Limit other sources of noise in the house, like TVs, laptops, and stereos.
To ensure the speaker and horn function properly, listen for the alarm sound during the test. You should hear a voice message and a loud buzzer.
If you have multiple Nest Protects, walk around to make sure you can hear them all. It's the best way to verify the speaker and horn are working.
If you can't hear the buzzer or voice, or Nest Protect doesn't make a sound when you start the test, contact Nest Support.