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How to Unlock the Honeywell T6 Pro Thermostat? YouTube . You can use that number to unlock your honeywell thermostat by following these steps: “1234” “2109” (which is the date code on the back) and “3343” (which is the date code 2109 + 1234) none of those worked. How To Reset Honeywell Thermostat T6 Pro from awestorial.blogspot.com We talk about how to find it.still having issues? You have to have a 4 digit pin. You will be asked for a passcode to unlock and enter the screen.