Furnace Heads-Up can let you know when your Google Nest thermostat has detected a problem with your forced air heating system. If Nest detects a problem, you’ll see the alert on the thermostat screen, in the Nest app, and in your monthly Nest Home Report, so you can check your system or contact a Nest Pro for service.
Why it's difficult to diagnose a system issue
Systems that work with Furnace Heads-up
When you'll see a Furnace Heads-Up
If your Nest thermostat detects that your furnace has been
Note: You’ll only see the Heads-Up on your thermostat and
What to do when you get a Furnace Heads-Up
When you see the Furnace Heads-Up alert on your thermostat
Limitations of Furnace Heads-Up
You can get Furnace Heads-Up notifications on the Nest thermostat whether or not your thermostat is connected to Wi-Fi and the internet. Furnace Heads-Up notifications in the Nest app and Home Report require your home to have a working internet service and Wi-Fi connection to your Nest thermostat. The notifications are relayed over the internet and can only work if the internet and Wi-Fi in your home are working. So if your Wi-Fi network goes down, it could adversely affect the availability and accuracy of Furnace Heads-Up.
Furnace Heads-Up is not a foolproof way to detect a problem with your forced air heating system and should not be relied upon as a way to monitor whether your heating system is working properly. These notifications are not intended to be a substitute for regular system service by an HVAC professional.