How do I lock and unlock the keypad on my T6 Pro thermostat?
Press Menu and go to LOCK. Select OFF (unlocked), PART (temperature only), or ON (no access). To unlock from a locked state, press the CENTER button and enter password '1234' using the navigation buttons. Press Select after each digit, then Select again after entering all four digits. Incorrect codes will display flashing dashes.
From the official Honeywell T6 Pro Smart Thermostat manual, page 5
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