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.

How do I restart or reset my Lennox S40 Smart Thermostat display?

1. In the thermostat, go to Menu > System Settings > Advanced Settings > Restart, and press the restart button.


2. Press the "Yes" button.


To reset the Lennox S40 Smart thermostat please contact your dealer by going to Menu > Lennox Dealer Support Services or Lennox (at 1-800-9-LENNOX)

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