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Nest thermostat Technical Info menu

You can find more details about your Nest thermostat in the Technical Info menu such as the model, serial number, software version and other important details.

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 sensors,
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.
Voc Vin Iin

Voc, Vin, and Iin measure the electrical current sent over your
system’s wires to your thermostat. Below are the ranges that
the Voc, Vin and Iin should stay in during normal operation.
There are different Vin and lin values if you have a common or C
wire in your thermostat:

If there isn't a C wire in your thermostat:

  • Voc: 29 to 42V
  • Vin:
    • 29 to 42V when your system is not running
    • 6 to 7V when your system is running
  • Iin: 20 to 40 mA

If there is a C wire in your thermostat:

  • Voc: 29 to 42V
  • Vin: 29 to 42V
  • Iin: 100 or 200 mA

Troubleshooting power issues

If the above power specs are outside of their normal range, you
may need to troubleshoot. For instance, if your Nest thermostat
won’t turn on and is unresponsive, or you see a blinking red
light at the top of the thermostat’s screen, your thermostat likely
isn’t getting enough power to charge its battery. For
troubleshooting, please see the following article:

           Troubleshooting when your thermostat won’t turn on >



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

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

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

Security This shows you what type of security your Wi-Fi network is
using: WPA, WEP, etc.
Interface This tells you the Nest thermostat's Wi-Fi network interface
which is typically “wlan0.”
Address 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
Router This is the network IP address of the router that your Nest thermostat
is connected to.
Address 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.
Router 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
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 determined from 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 or cool 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


Equipment sensed on

This shows which connectors on the Nest thermostat base
have wires in them. This is determined by the physical position
of the connector button, not by wire voltage.

Troubleshooting: If the wires listed here don't match what wires
are actually in the thermostat connectors, check that the wires
are fully inserted and that the connector button stays down.
Also check that there isn't anything (such as a broken wire end)
jamming any of the connectors.



The location name given to your Nest thermostat during setup.

Note: You can change the name by going to Settings  Where 
on the thermostat or with the app.

Software version

This shows the software currently installed on the Nest

         Nest thermostat software update history

Model The model number of your Nest thermostat display. This varies
between different models and generations of Nest
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
Unlocked This lets you see if your Nest Thermostat E is locked or
Time Zone The time zone for the Nest thermostat is based on the ZIP code
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.

Model The model of your Nest thermostat base.
Serial number Your Nest thermostat's base has a unique serial number.
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