Arm: 4 digit code
Disarm: 4 digit code
Check Faulted Zones: Delayed light ON = Delay door closed and ready to arm. Instant light ON = Other doors and windows closed and ready. If either light is OFF, something is open.
Change code: Press [BLANK] key, Enter OLD code once, NEW code twice. New code must also be 4 digits.
User Manual: D279 Manual