To unlock a Honeywell VisionPro 8000 thermostat that has been secured with a screen lock or password, tap the Menu button, select Screen Lock, and enter your 4-digit security PIN code using the on-screen keypad if you have previously configured one. If the thermostat is locked in advanced installer mode, you must enter your dynamic 4-digit date code derived from the manufacturing sticker on the back of the display faceplate. Verification: Confirm that the padlock icon disappears from the display screen and touch controls are fully restored.
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