At present, we are conducting a thorough investigation into numerous smart thermostat producers, with our main focus on Lennox.
Lennox has been in the HVAC industry for over a century producing a wide range of systems for both commercial and residential.
Their latest HVAC controls have all of the smarts that you'd expect from the industry leaders Nest and Ecobee.
In this article, I provide helpful links to owners' manuals for those who have run into difficulties with their thermostats.
I also touch on some controls you'll need to know to operate your system along with some troubleshooting tips for common problems.
Lennox Thermostat Manuals
It can sometimes be difficult to find the correct instruction manual for your device, particularly for older, discontinued models.
Use the search bar below to find your specific Lennox Thermostat Manual. You can enter the model number, name or description. We’ve also included images to help.
If you have a manual you would like to list, submit it here. Or, if your model is not listed, leave a comment below.
All imagery and manuals are copyright © Lennox. Please visit https://www.lennox.com/ for the most up to date manuals and product information. You can read our DMCA policy here.
| Model Image | Model ID | Description | Document Updated | Downloads |
|---|---|---|---|---|
|
3000 Series Thermostats
ComfortSense 3000
|
Programmable & Non-Programmable Thermostats |
Document(s) Updated: 2008
|
|
|
|
Supersedes 507342-01
507342-01, 5/2017
|
iComfort Wi-Fi Thermostat |
Owners Manual
Document(s) Updated: 2017
|
|
|
|
Elite Series
|
Programmable Touch Screen Thermostats |
Owners Manual
Document(s) Updated: 2005
|
|
|
|
51M37 Merit Series
51M37, 05/05, 505,050M
|
5/2 Day Programmable Thermostat |
Instruction Manual
Document(s) Updated: 2005
|
|
|
|
Controls (51m32)
51M32, 504,865M, 09/04
|
Merit Series Thermostat |
Instruction Manual
Document(s) Updated: 2003
|
|
|
|
ComfortSense 3000 Series
L3732H
|
7−Day Programmable Thermostat |
Instruction Manual
Document(s) Updated: 2008
|
|
|
|
ComfortSense 3000 Series
L3021H
|
Non‐Programmable Thermostat |
Instruction Manual
Document(s) Updated: 2018
|
|
|
|
icomfort Wi−Fi Thermostat
506921−01
|
Touch Screen Programmable Communicating Thermostat |
Owners Manual
Document(s) Updated: 2012
|
|
|
|
iComfort S30
Smart Hub 2.0, 507537-04 4/2018
|
Ultra Smart Thermostat |
User Manual
Document(s) Updated: 2018
|
|
|
|
iComfort Wi-Fi Thermostat
507341-02 5/2017
|
Touchscreen Programmable Communicating Thermostat |
Installation Manual
Document(s) Updated: 2017
|
|
|
|
Deluxe
81M26, 81M27, 81M28
|
PROGRAMMABLE THERMOSTATS with Humidity Control |
User Manual
Document(s) Updated: 2005
|
|
|
|
icomfort Thermostat
|
Touch Screen Programmable Communicating Thermostat |
Installation Manual
Document(s) Updated: 2009
|
|
|
|
icomfort Wi-Fi Thermostat
|
Touch Screen Programmable Communicating Thermostat |
Installation Manual
Document(s) Updated: 2012
|
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|
|
iComfort E30
|
Smart Thermostat |
Installation Manual
Document(s) Updated: 2017
|
|
|
|
ComfortSense 7500
13H14, 507503-01, 10/2015, Supersedes 7/2015
|
Color Touchscreen Programmable Residential Thermostat |
User Manual
Document(s) Updated: 2015
|
|
|
|
ComfortSense 3000 Series
L3011C
|
Non-Programmable Thermostat |
Instruction Manual
Document(s) Updated: 2008
|
|
|
|
ComfortSense 3000 Series
L3532H
|
5/2 Day Programmable Thermostat |
Instruction Manual
Document(s) Updated: 2008
|
|
|
|
Comfort Sense
|
Touchscreen Thermostat |
Instruction Manual
Document(s) Updated: 2008
|
|
|
|
iComfort S30 Smart Thermostat
12U67, 507536-02
|
Color Touchscreen Programmable Wi-Fi Communicating Thermostat |
Installation Manual
Document(s) Updated: 2017
|
|
|
|
ComfortSense 5000 Series
|
Touchscreen Thermostat |
Installation Manual
Document(s) Updated: 2008
|
|
|
|
43558, 41653
|
Programmable Heat Pump or Multi-Stage Auto Season Thermostat |
Owners Manual
Document(s) Updated: 2004
|
|
|
|
ComfortSense 5500
13H13
|
Color Touchscreen Programmable Thermostat |
User Manual
Document(s) Updated: 2015
|
|
|
|
ComfortSense 7000 Series
L7742U
|
TTTouch Screen Programmable Thermostat |
Owners Manual
Document(s) Updated: 2009
|
|
|
|
ComfortSense 7500
13H14, 507504-02
|
Color Touchscreen Programmable Thermostat |
Installation Manual
Document(s) Updated: 2017
|
|
|
|
iComfort E30
507687-03 4/201
|
Smart Thermostat |
User Manual
Document(s) Updated: 2018
|
|
|
|
ELO183B 101/114
|
Elo183b Series Units |
Installation Manual
Document(s) Updated: 2015
|
How to find your Lennox Thermostat’s model number?
Look for a label on the device, usually on the back (where you'll need to detach the faceplate) or inside the cover. If the device is already set up and has an LCD display, you’ll also find the information through the menu.
Lennox Thermostat Instructions
Here are some general steps for common operations you can do. Again it's always best to check the specific Lennox thermostat manual for exact instructions.
Programming/Scheduling
Older models have physical buttons MENU (then go to PROGRAM) or PROG to allow you to set schedules. Those with a SCHED button, go through SCHED > EDIT.
For newer touchscreen models like iComfort, access your Features screen (likely through the right arrow from Home) then “edit programs”. Press HELP for simple instructions.
Program/Temperature Hold
For most earlier models, you can press the Up/Down buttons to temporarily override the schedule. Pressing the HOLD button instead will initiate permanent HOLD.
Models with HOLD TEMP can select from either of the two modes, as well as a vacation hold for longer durations.
For newer touchscreen models, press a set temp button (cool to or heat to). This will override the programming.
Fan setting
Press the FAN button (or “fan is AUTO/ON/CIRCULATE”) if your model has it.
For owners of models with the modes/schedules option such as the iComfort E30, pres it then select the fan icon.
Reset
Some older models have the reset button (unlabeled, recessed) within the door or behind the product which you can press or long-press to reset it to factory defaults. For newer ones, you’ll find the function within the settings in the interface.
Steps vary per model, sometimes even models of the same series. Make sure to download the correct Lennox thermostat manual for your model.
Lennox Thermostat Troubleshooting
Below are some common issues you might encounter with your thermostat and what may be causing the problem.
Wi-Fi connection problem
This is a common issue with Wi-Fi and smart thermostats. First, check changes to your network. Try to reconnect the thermostat to your network.
In case of interference, identify other radio-emitting devices or appliances close by between your router and thermostat. Common culprits are microwave ovens, Bluetooth devices, or other wireless devices.
You could also check the signal strength (RSSI) of your Wi-Fi, which you can do within the network settings of your Wi-Fi/smart thermostat.
Heating/cooling, display malfunctioning
With cooling or heating problems, check your schedule. Also, check if the proper indicator is displayed (Heat On or Cool On).
Check your power sources. If your thermostat uses a battery, it might be drained already. Otherwise, check the C-wire connected to your thermostat, other power wiring on your system, or your breaker (tripped, blown fuse, etc.). A lot of issues are caused by this, so you might consider a technician.
Types of Lennox Thermostats
Lennox has a convenient range of thermostat models that cover most budgets and needs for home air comfort. The current lineup is capable of programming/scheduling and works with most types of HVAC systems.
Smart Thermostats: iComfort S30, E30, M30
This lineup is led by the flagship, iComfort S30 Ultra Smart Thermostat, which Lennox describes as “the ultimate controller” for home comfort. It has the smart features you need and more but is reserved for Lennox equipment only.
You’ll be happy with either the E30 or M30 smart thermostats. The M30 has the smart features of other competitors, and E30 has the nice-to-haves you might want, such as weather screensavers, “allergen defender”, or humidity control.
iComfort Wi-Fi Touchscreen (limited to Lennox equipment) and ComfortSense 7500/5500 models
These models give you wireless connectivity, providing savings, and still have the features you need, and more that you might want.
The ComfortSense models might not have those smart functionalities, they still provide touchscreen convenience and clever features, such as temperature monitoring, energy reports, and filter reminders.
ComfortSense 3000 Series
Last on the current lineup, but might just be the perfect choice for your setup. It gives you that “just works” simplicity at a value price, with the basics and more.
To help educate you further about current Lennox thermostats, check out this product comparison document by the company.
1 Comment
DONALD E HALL
All of LENNOX THERMOSTATS are not compatible and I can’t , for any reason why? The diagram s to connect to the system that has the ” RI+ I- C” Wall connector Red(R) Green (G) White (W) and Common (C) is not shown on any of the thermostat. Why? All other Thermostat , even the ones that require the “C” wire gives you a connection diagram, from the $13.95 -the $459.99 ones. Your M-30 will never come loose from the wall. shows great instructions to connect the stud. nothing about how to connect the wires from the wall to the thermostat.