Learn about the Nest thermostat's Technical Info menu

You can find more details about your Nest thermostat in Technical Info. Some of this info can be help with troubleshooting the Wi-Fi connection, power and other issues.

If you need to find any technical information about your Nest thermostat, such as its network IP address or its software version, you can find it in the Technical Info menu.

To get to the Technical Info menu on your Nest thermostat:

  1. Press the thermostat ring to bring up the Quick View menu.
  2. Turn the ring to Settings Nest settings icon and press to select.
  3. Turn the ring to Technical Info and press to select.

Note: You can also see some of the same information in the nest app by tapping your thermostat on the app home screen, then selecting Settings Nest settings icon and thenTechnical Info.

There are a few different sections with information about your Nest thermostat's senosrs, your Wi-Fi network, your thermostat's serial and model numbers and much more. Below is a list of what you'll see on your thermostat.



This is the current voltage of your thermostat’s internal rechargeable battery. The voltage will fluctuate, but it should be higher than 3.6V when it’s charging normally.

If your thermostat isn’t receiving enough power to charge the battery and it falls below 3.6V, your thermostat will turn off Wi-Fi, delay software updates, and disable the screen to preserve the battery charge and delay shutting down completely.

  • 3.7V is required to install a software update.
  • 3.6V is required for the display to turn on when you approach.

Troubleshooting power issues

If you see a blinking red light on your thermostat, or it’s is unresponsive and won’t turn on, there may be a power issue. You can monitor the battery charge in Technical Info to see if it drops below 3.6V. For detailed troubleshooting steps, please see the following article:

Troubleshooting when your thermostat won’t turn on >

Vusb Vin Iin

Vusb, Vin, and Iin measure the electrical current sent to your thermostat. The values can vary depending on whether your thermostat’s battery is being charged by the USB power cable or wires from the Heat Link.

Heat Link

Serial Number

The Heat Link has a unique serial number.

Device ID

The device ID is also unique to your Heat Link.

Software Version

This is the current software version installed on your Heat Link. Software updates are sent automatically as long as your thermostat is connected to Wi-Fi and the internet, and your Heat Link is connected to your thermostat.


The model of your Heat Link.

Entry Key

You’ll enter the key in the app to to connect your Nest Learning Thermostat to the Heat Link.

Note: There is no key for the Nest Thermostat E's Heat Link.

Battery level

If you have a Nest Thermostat E, you will see your Heat Link’s current battery charge. It will say “OK”, if the charge is sufficient.

Nest Weave

Fabric ID

The unique identification code that your thermostat uses for Thread communications with other products.

Nest Thermostat E will also show you the connection status, which will say “Connected to Nest” when working normally.



Here you’ll see the name of the Wi-Fi network your thermostat is currently connected to, and the network PING (measured in milliseconds).

The signal strength has a maximum value of 100. A signal strength of 75 is considered strong, while a value of 36 or lower is considered weak.

You can use the signal strength to help troubleshoot offline issues with your thermostat. Try moving your Wi-Fi router or extender to see if the signal strength improved.

Note: If disconnected from Wi-Fi, you’ll simply see “Client not connected.”


This shows you what type of security your Wi-Fi network is using: WPA, WEP, etc.


This tells you the Nest thermostat's Wi-Fi network interface which is typically “wlan0.”



This is your Nest thermostat’s network IP address, which is assigned by your router. You can also see the the thermostat’s IP address on your Wi-Fi router’s list of connected devices.

Subnet mask

A subnet mask is used to identify the network location of an IP address. Most home networks use the default subnet mask


This is the network IP address of the router that your Nest thermostat is connected to.



This is your thermostat’s IPV6 network address, which is used for Thread communications.

Prefix length

Similar to an IPv4 Subnet Mask, an IPv6 Prefix length is used to identify the network section of an IPv6 address.


This is the IPv6 address of the router that your Nest thermostat is connected to.

Name servers

This tells you the address of the Domain Name System (DNS) server and backup DNS server used by your thermostat.

Search domains

This is used if your Nest thermostat needs to resolve an unqualified domain name. If not, you will see “none.”

Service Environment

Most people will see “production.” If you are participating in the Nest Field Test program, you will see “ft.”

Last data upload

The exact date and time of your thermostat’s last automatic data upload to the Nest service. For more information, please see our privacy FAQ.

Last cloud comm

The exact date and time of your thermostat’s last communication with the Nest service. This syncs your Nest thermostat and the app so they can show you the same information.

MAC address

This is the unique network ID assigned to your Nest thermostat’s network hardware when it was manufactured.


Current temp

The current ambient temperature in the room measured by the Nest thermostat’s internal sensors. The temperature is also displayed on the thermostat's temperature screen.

Target temp

The temperature set on the Nest thermostat that the system system is currently trying to heat to.

Rel. humidity

The relative humidity in the room measured by the Nest thermostat’s internal sensors.


This shows status information about the activity and light sensors in the Nest thermostat.

Note: A sensor can be working normally and show a reading of 0.



The location name given to your Nest thermostat during setup.

Note: You can change the name by going to Settings Nest settings icon  and then Where on the thermostat or with the app.

Software version

This shows the software currently installed on the Nest thermostat.

Nest thermostat software update history >


The model number of your Nest thermostat display. This varies between different models and generations of Nest thermostats.

Serial number

Your Nest thermostat’s display has a unique serial number.

Device ID

The Nest Thermostat E will list a device ID that’s unique to your display.


This lets you see if your Nest Thermostat E is locked or unlocked.

Time Zone

Nest Learning Thermostats will show the current time zone based on the postcode entered during setup.



Software version

This shows the software version installed on the Nest thermostat's base.

Note: If your thermostat is connected to Wi-Fi and the internet, it will automatically download the latest software.


The model of your Nest thermostat base.

Serial number

Your Nest thermostat's base has a unique serial number.

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