How do I factory reset the Honeywell T6 Pro Thermostat?
Press and hold the Power button for approximately 10 seconds until the LED flashes red. This clears all settings and returns the device to factory defaults. You will need to re-pair all connected devices after the reset. (Page 23)
From the official Honeywell Honeywell Thermostat Manuals Pro Series Honeywellhome And Others manual, page 23
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