Honeywell 301C User Manual page 24

Since the controller's programming functions are password protected,
it is necessary to access the login screen:

Press Enter to access the programming options. The password
screen appears:

Use the keypad Up or Down arrows to increase or decrease the
value, one digit at a time, starting with the first digit

When all the digits of the password are correct, press Enter to
access the programming functions.
The first MENU options screen appears. Use the keypad arrows to
navigate through multiple screens to the desired function and press
Enter to access it.
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