How the Nest Thermostat and Nest Protect work together in a carbon monoxide emergency
For your safety, when Nest Protect detects emergency levels of carbon monoxide (CO) it communicates with the Nest Learning Thermostats in your home to shut off your fossil fuel based home heating system.
Why does my heating system shut off?
Nest Protect is designed to detect and respond to emergency levels of carbon monoxide but it has no way of knowing where the CO is coming from. The Heating Shutoff feature lets Nest Protect tell your Nest Learning Thermostat there is CO present in your home and for safety, shuts the heating system off—a possible source of poisonous carbon monoxide leaks.
If you have any questions about a carbon monoxide problem, call a qualified technician.
What’s required to be able to take advantage of Heating Shutoff?
This feature relies on an active Nest account, and requires your home to have a working Internet service and Wi-Fi connection to both your Nest Protect and Nest Learning Thermostat. The signal is relayed over the Internet and can only work if the Internet and Wi-Fi in your home are working.
Can I turn this setting off?
You can access the Heating Shutoff feature on your smartphone or tablet from the Nest app or on the Web.
When does the heating come back on?
If heating is shut off, Nest Protect will send a notification to your smartphone or tablet. To receive notifications you need the Nest app installed and need to be logged in with your Nest Account.
You can turn heating back on from the Nest app or manually on the Nest Thermostat.
Important note: Always identify the source of the carbon monoxide and be sure the issue has been addressed before turning the heating system back on. If your furnace was the original source of carbon monoxide it should not be operated until a professional has inspected and serviced it.
Important Information about this feature
Since Nest has no way to tell if the gas furnace is the source of your carbon monoxide alarm, you should not rely on this feature instead of consulting a professional technician to determine the source of CO. Heating Shutoff is not a substitute for getting out of the house immediately and remaining outside until the alarm has cleared or emergency service has arrived. If carbon monoxide alarms persist, you should investigate the reason for the carbon monoxide alarm by contacting a qualified technician.
The feature will not work when Nest is in AWAY status.