How to test your system with a Nest thermostat

After you’re done installing your Google Nest thermostat it will ask you to run a system test. This is a necessary step to make sure your new thermostat is correctly wired and controlling your system as it should. Testing can help you catch incorrect wiring blown fuses and other problems. You can also run a system test later if you need to diagnose a problem.

How to test your system during thermostat setup

 

During setup, you’ll connect your Nest thermostat to Wi-
Fi and enter your ZIP or postal code. Once these steps
are done your thermostat will connect to an Internet
based weather service and use the current local
temperature to determine if it’s too hot or cold to test
your system. If so, it will tell you to test your system
later.

When the weather becomes more temperate,
you can test heating or cooling by going to Settings 
 Equipment.

System test now

If the weather is OK, to test your thermostat will automatically guide you through each step.

  1. Simply choose Test Now when you see it on the thermostat screen.
  2. Next you'll see the system components that you can test. Select one to begin testing. Select Continue to go back to the Equipment menu. 
    • Depending on your region and system, you can choose a specific system function to test such as: HeatingCooling, or Fan. If your system doesn’t have one of these options, you won’t see it.
    • The thermostat will tell you what to look for during the test. For instance if it tells you “Radiators should be warming up.” go and feel if the radiators are getting warm.
    Note: Depending on your system you may have to wait 30 minutes or more for a noticeable temperature change. In-floor radiant systems in particular can take a while to warm up. Select Continue Testing if needed to keep running the test if you have a system that’s slow to warm or cool. 
     
  3. Select Done if your system responds to the test correctly. For instance the radiators get warm while testing heating.

    Select Troubleshoot if there’s a problem. For instance, if you see an error message on your thermostat that begins with T (such as T03) go to Troubleshooting system test errors for help diagnosing the issue.

How to test your system after setup

It's also a good idea to test your system before the
seasons change and when you'll be relying on heating
or cooling for that season. Test heating on a cool day at
the end of the summer to make sure it's working before
that first cold snap hits. In the spring you should also
test cooling on a warm day before the first heat wave of
the summer.

That way you'll be confident that your system is in good
shape - and if something's wrong you won't have to
wait for an appointment with a professional who's fully
booked when everyone turns on heating or cooling for
the first time. If you need to test your system anytime
after setup it's easy to do.

Your system heating

Here's how:

  1. Choose Settings from the Quick View screen.
  2. Go to Equipment. You'll see the wires that the Nest thermostat has detected.
  3. Select Continue.
  4. Next you'll see the system components that you can test. Select Test to begin testing. Select Continue to go back to the Equipment menu. 
    • You can choose a specific system function to test such as: HeatingCooling, or Fan. If your system doesn’t have one of these options, you won’t see or be able to see it.
    • If it’s too hot or cold to test your system, you’ll see a message letting you know. When the weather becomes more temperate, you can try to test again.
    • The thermostat will tell you what to look for during the test. For instance if it tells you “Radiators should be warming up.” go and feel if the radiators are getting warm.
    Note: Depending on your system you may have to wait 30 minutes or more for a noticeable temperature change. In-floor radiant systems in particular can take a while to warm up. Select Continue Testing if needed to keep running the test if you have a system that’s slow to warm or cool. 
     
  5. If you see an error message on your thermostat that begins with T (such as T03) go to Troubleshooting system test errors for help diagnosing the issue.
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