Bryant TSTATBBPB501 User's Information Manual page 19

About Advanced Features & Operation
KEYPAD LOCK - To prevent unauthorized use of the thermostat,
the front panel buttons may be disabled. To disable, or
'lock' the keypad, press and hold in the Mode button.
While holding the Mode button in, press the Up and Down
buttons in together. The Locked icon will appear on the
display.
Press all 3 for
Keypad Lockout
MODE
To unlock the buttons, again press and hold the Mode
button. While holding the Mode button in, press the Up
and Down buttons in together. The Locked icon will
disappear from the display.
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Locked
ProgramOn
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H
EAT