How To Set Up Nest Fire Alarm. A Heads-Up is a friendly warning before conditions get dangerous. For 1st gen Nest Protects write down the entry key for each of your Protects and put it in a safe space.

Pulses yellow and tells you where smoke or carbon monoxide is. Nest Protect can see smoke or carbon monoxide levels rising. How do I set up check-in monitoring.
Heads-Up and Emergency Alarms.
That way you wont have to look up or remember the number. An Emergency Alarm occurs when smoke or carbon monoxide reach dangerous levels. Since all other parts of the Nest Secure Alarm system needs this to function it is recommended to set this up first. Before actually installing the Nest Protect on your ceiling or wall its much easier to set it up first while you have it right in front of you.

