First, see if you can locate a four-digit pin on the back of the thermostat - To do this, you might have to pull out the thermostat from the mounting plate and check the back of the device. Then plug the thermostat back in and try this four-digit code.. Touch the screen. You will be asked for a passcode to unlock and enter the screen. You will need to add 1234 to your date code. Example: 1234+1632 = 2866 pass code.
When SCREEN LOCK is active, a "lock" icon will be displayed on the thermostat display. Press Menu on the thermostat. Press + or - to go to LOCK. Press Select. Press + or - to go to OFF, PART, or ON, and then press Select. To unlock the keypad, press the CENTER button and then enter the password "1234".. How to Unlock Honeywell T6 Pro Series Smart Thermostat. To unlock a Honeywell T6 pro series, follow the instructions below: Tap the padlock icon on the T6 Pro display to bring up the PIN unlock screen. Enter the 4-digit PIN using the +/- keys to select digits and the 'Select' button to confirm digits. The default PIN is usually 1234.