Based on recent interactions that had a similar issue, you can restart the s40 thermostat directly from the thermostat itself, but not from the s40 mobile app. here are the steps to restart the thermostat: on the thermostat, go to menu > system settings > advanced settings > restart. press the yes button to confirm the restart. please note that any changes made will be applied to the thermostat and not through the mobile app. if you encounter any issues, please reach out to lennox technical support at 1-800-453-6669 if you are a technician or 1-800-953-6669 if you are a homeowner.
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