How do I lock or unlock the keypad on the T4 Pro?
Press Menu, navigate to LOCK using the arrow buttons, and select OFF (unlocked), PART (partial lockout for temperature only), or ON (no access). To unlock, press the CENTER button and enter the default password '1234' using the arrow buttons and Select to navigate through each digit. (Page 5)
From the official Honeywell T4 Pro Thermostat manual, page 5
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