From the removed thermostat, login using your Lennox S40 credentials under Menu > User Account. Logging in will automatically add the Lennox S40 Smart Thermostat to your account again. You will be prompted to re-enter the home address.
Note: If there was more than one thermostat registered in the home at the time it was removed, you will have to repeat this process for every thermostat.
FREQUENTLY ASKED QUESTIONS
Perfect comfort is something we want you to experience long after you’ve purchased your Lennox® product. That’s why we offer a collection of resources that make it as easy as possible for you to get the answers and support you need.


