To change a user code on a Honeywell Lynx 5210, navigate to Security > More > Tools, enter the current master code, select Users, choose the user you want to edit, and then enter the new code.
- From the home screen, press Security, then the More tab.
- Select Tools.
- Enter your current master code (the default is 1234).
- Tap Users.
- Tap the name of the user you want to edit (e.g., Master User).
- Tap Edit and then select the User Code field.
- Enter the new four-digit code using the on-screen keypad.
- Press Done.
- Press Save to save the changes before exiting.
- You can press the back arrow or the home button (green house) to return to the home screen.
To add a new user, click on the “New” button and follow the instructions.