How do I lock or unlock the keypad on the T6 Pro Thermostat?
Press Menu, then LOCK, and select OFF, PART, or ON to set your preferred lockout level. To unlock the keypad, enter the password '12 34' using the CENTER button and digits 0-9. If the password is entered incorrectly, press Back to try again. (Page 2)
From the official Honeywell T6 Pro Thermostat manual, page 2
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