A memory light on means that there was an alarm during the armed period. Be careful! While it is not likely there may still be an intruder in your home or office. You should be able to view the zone or zones that were triggered during the armed period. For further assistance please call our signal receiving centre at a local number or at 1-800-265-7562. After you view the memory indications you will have to successfully arm and disarm the system twice to clear the memory.