How do I perform a system test on my Honeywell T6 Pro Thermostat?
Press and hold CENTER and navigation buttons for approximately 3 seconds to enter advanced menu, use Select button to go through Heat, Cool, Fan, Em Heat or Ver (version information) options until desired mode is set, press Home button to exit.
From the official Honeywell Honeywell Thermostat Manuals Pro Series Honeywellhome And Others manual, page 8
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