How do I factory reset the thermostat and restore original settings?
To restore original settings, enter system setup by pressing the SYSTEM button and holding the center blank button for approximately 5 seconds. Navigate to function 0710 and change the setting to 1, which disconnects the thermostat from Wi-Fi and restores original settings, erasing all customizations. (Page 58)
From the official Honeywell RET97B5D100 Home Programmable Thermostat manual, page 58
Have a follow-up question?
Answers from the official manual.
Common questions