How do I find out which doors or windows are open before arming the system?

Press the [∗] key (do not enter a code first) to display all faulted zones on the keypad. This will show you which doors, windows, and other protection zones are open so you can secure them or bypass them before arming. The system will display a 'Not Ready' message if any zones are open. (Page 16)

From the official Honeywell Vista-20P Security System manual, page 16

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