Lennox Thermostat Not Showing Outside Temperature [Solved]

Is your Lennox thermostat failing to display the outside temperature, leaving you guessing about the outdoor weather? Don’t sweat it! In this comprehensive troubleshooting guide, we’ll unravel the secrets behind this sneaky  issue and equip you with the knowledge to fix it in no time.

To enable the display of the outdoor temperature on  Lennox thermostat, go to

Menu——Settings———-Display———-Outdoor Temperature Display——-Sensor

Without enabling the outdoor temperature display, your thermostat could run as it should but will not sense the outdoor sensor. 

With that said, when your outdoor temperature is not sensed, you will have no outdoor temp showing on the front screen and that is probably when you are facing this problem.

Possible Reasons your Lennox is not showing outdoor temperature and Solutions

Possible causeFix
Outdoor temperature display not enabledEnable outdoor temp display
Sensor not enabledEnable sensor
Loose wiresSecure the wires
Bad thermostatReplace thermostat

Outdoor temperature display not enabled 

The first thing you ought to check for is the  outdoor temperature display setting.  The setting can be accessed by going to the menu section of your thermostat.

Go to menu—->settings—->Display—->outdoor temperature display.

When you get to the outdoor temperature  display you will have the  following setting options available are:

1. Outdoor Weather – Turn ON to display weather on the HOME screen.

2. Outdoor Temperature Display – Options are:

• Internet (AccuWeather) – Will display weather provided by AccuWeather

for the local area based on the homeowner zip code.

Read also: How to Fix Lennox icomfort Thermostat Blank Screen

Sensor not enabled 

The Lennox thermostat relies on an outdoor temperature sensor to gather the necessary information and display it on the screen. 

If the sensor is not enabled or activated, the thermostat will not receive the outdoor temperature data. This could occur if the sensor was not installed correctly or if there was a malfunction or disconnection in the sensor wiring.

Loose wires

The connection between the Lennox thermostat and the outdoor temperature sensor is typically established through wiring.

 If the wires connecting the thermostat and the sensor are loose, damaged, or disconnected, the thermostat will not receive the outdoor temperature readings.

 Loose wires could result from improper installation, wear and tear, or external factors such as rodents or physical damage.


Loose wires:

  • Turn off the power to the Lennox thermostat by switching off the corresponding circuit breaker.
  • Carefully inspect the wiring between the thermostat and the outdoor temperature sensor.
  • If any wires are loose, reattach them firmly and ensure proper connections.
  • If there are damaged or severed wires, they may need to be repaired or replaced.
  • Once the wiring is secure, restore power to the thermostat and check if the outdoor temperature is now being displayed.

Read also: Nest Thermostat Showing Offline In App But Connected To Wifi? [Fixed]

Bad thermostat

 If the Lennox thermostat itself is malfunctioning or defective, it may not be able to display the outdoor temperature even if all other components are functioning properly. 

A faulty thermostat could be the result of internal electrical issues, a software glitch, or physical damage. In such cases, the thermostat may require repair or replacement to restore its proper functioning.


Can a software update fix the issue of the Lennox thermostat not displaying the outdoor temperature?

It is possible that a software update can address software-related issues causing the outdoor temperature display problem. Check for any pending updates and update your thermostat’s software.

What are the signs of a malfunctioning outdoor temperature sensor?

If the outdoor temperature sensor is malfunctioning, you may notice erratic temperature readings, consistently incorrect readings, or no readings at all on your Lennox thermostat.

 In such cases, I would advise you to check the sensor’s wiring and connections, or consider replacing the sensor if necessary.

Can extreme weather conditions affect the outdoor temperature display on my Lennox thermostat?

Yes, extreme weather conditions such as severe cold or excessive heat can impact the outdoor temperature sensor’s performance. 

Ice, snow, or excessive heat around the sensor can interfere with its ability to accurately measure the outdoor temperature, leading to a lack of display on the thermostat.

How often should I check the wiring connections between the thermostat and the outdoor temperature sensor?

It is advisable to periodically inspect the wiring connections between the thermostat and the outdoor temperature sensor.

 Checking the connections during routine maintenance or when experiencing display issues can help identify and address loose or damaged wires promptly.

Read also: Carrier Infinity Thermostat Blank Screen [Fixed]

If none of the suggested solutions work, should I consider replacing the Lennox thermostat?

If all troubleshooting steps have been attempted and the outdoor temperature display issue persists, replacing the Lennox thermostat might be a viable solution.

You might also want to  consult a local professional technician or contact Lennox customer support for a second opinion before going for a thermostat replacement.

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