Lennox S40 User manual

Lennox S40 Smart Thermostat
Quick Start Guide

Step 3: Enable Advanced Diagnostics
Protect your investment and peace of mind with active monitoring of system
operations through your Lennox S40 Smart Thermostat. This feature is free of
charge and provides basic maintenance reminders, alerts you of potential issues,
and can even allow you to remotely share diagnostics with your local Lennox
dealer to troubleshoot and fix problems. This proactive care helps eliminate
downtime and avoid unnecessary service visits and repair costs, ensuring
nothing short of perfect air.
From your thermostat’s home screen,
go to Menu > Settings > Dealer Support Services
There are two screens under this section, Service Contact Info and Dealer Support
Access. If you wish to allow your service provider direct access for troubleshooting
your system, then select the following (highly recommended):
Remote Sharing:
“ON” - Allows your Lennox Dealer to remotely evaluate the status of your system
to ensure optimal performance.
Advanced Diagnostics & Troubleshooting:
• “ON/ALWAYS” - You will always give authorization to your Lennox Dealer to
troubleshoot your system remotely.
• “OFF” - You will not give authorization to your Lennox Dealer to troubleshoot
your system and address system performance remotely.
Alerts and Notications:
• “ON” - Allows your Lennox Dealer to receive updates when your system
needs maintenance.
Note: All three options must be toggled on for Advanced Diagnostics &
Troubleshooting to function.
Step 4: Download the Lennox Smart Thermostat App
Search for the “Lennox Smart Thermostat App” in the Apple App Store or on
Google Play, and download to your smartphone or tablet.
You can now access your account through either your Lennox Smart Thermostat
or the app. Add a new thermostat, create a new account, or change your settings,
whenever you want.
From your home screen, go to Menu > User Account and enter your credentials.
If you already have an account and are connecting multiple thermostats, select
“Existing Account” and use your credentials to connect them.
Step 1: Connect your thermostat to Wi-Fi
From your thermostat’s home screen, go to Menu > Settings > Wi-Fi. Toggle
the Wi-Fi option to “ON” and select on “Not Connected.”
• The thermostat will automatically list the Wi-Fi networks it discovered.
Troubleshooting:
• Choose 2.4Ghz (if applicable).
• Ensure you are logged in to your own Wi-Fi network and not one nearby that
you’re not authorized to use.
Step 2: Create Your Account and Login Credentials on
your Lennox Smart Thermostat
Once your Lennox Smart Thermostat is connected to Wi-Fi, you’re ready to
create an account and take control. If you already have an account, simply sign in
using your email and password.
Create Your Account
From your thermostat’s home screen, go to Menu > User Account.
1. Select “Create New Account.”
2. Enter account details such as your first and last name, phone, email address,
and password.
3. Toggle whether you want to receive email updates and reminders. By signing
up for email updates, you will receive a monthly performance report.
4. Click to allow your dealer to receive service alert (highly recommended).
5. Click to agree to the Lennox End User Licensing Agreement (EULA).
6. Enter your information and select “Next.” Enter your country/region, address,
city, state, and zip code.
7. Select “Create Account.”
Welcome to Your Home Comfort Command Center
Let’s get started
Account Creation Screen

Adjusting the Temperature
Tap your thermostat’s home screen to go to the horseshoe-shaped dial where
you can adjust the temperature in either of two ways.
Screen Navigation
If you wish to toggle around screens, simply swipe left or right. You can also tap on the status bar to access a screen.
Temperature Status My Home Edit Set Point
One-Touch Away Mode
Overrides your regular programming schedule with a single
touch and sets back your heating and cooling set points to
save energy.
Smart Away™ Mode
Smart Away™ Mode uses the GPS in your smartphone to detect when you’re
leaving, and automatically adjusts the temperature to a more energy-efficient
setting. If you or a family member returns home, Smart Away then returns your
system to a normal schedule and comfortable temperature.
Schedule IQ™
Combines with Smart Away™ Mode to learn your routine and create an energy-
optimizing schedule of operation.*
To enable Schedule IQ, go to Menu > Schedule > Schedule IQ > Edit. You can
set your preferred temperature for up to four time periods per day by sliding the
blue and red circles along the line on the touchscreen. Add the Lennox Smart
Thermostat App to your smart device and your system will automatically adjust
the temperature when you’re away, saving energy and money.
*Smart Away must be turned on in order for Schedule IQ to function.
Smart Home Integration
Effortlessly integrates with a range of smart home devices—
from premium smart home systems like Control4 to popular
virtual assistants like Amazon Alexa and Google Assistant.
For additional setup, videos and troubleshooting information, go to:
lennoxsmartertogether.com/help/index.html
1. First activate Smart Away on your thermostat.
2. Enable Smart Away on the mobile app. Go to Menu > Settings > Away and
turn on “Smart Away.”
3. The GPS distance at which Smart Away detects your smartphone is factory
set at a 2-mile radius. To change this, press the “+” or “-” buttons under
Smart Away Fence.
*For Smart Away to function properly, location services must be enabled on your
mobile device.
1. Using the Horseshoe Dial
Touch the red circle to adjust the temperature in heating
mode and the blue circle to adjust it in cooling mode.
If Perfect Temp* is enabled, you’ll see one dial that allows
you to set your desired temperature.
2. Tap “Heat To” or “Cool To” Icons
Tap either of the “Heat To” or “Cool To” icons where a
detailed horseshoe dial will allow you to select the perfect
heating or cooling temperature setpoint.
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Lennox S40 Smart Thermostat
Due to our policy of continuous improvement, specifications
are subject to change without notice.
Printed in U.S.A.
©2022 Lennox Industries,
a Lennox International Inc. Company
LNXTC 05/22
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Support Pages
Smart Home Devices
Spanish/French Documents
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