Why does my lock alarm after unlocking with the thumb turn? Blair April 10, 2019 20:47 Updated Please check if Away Mode is enabled. If yes, input the Master PIN Code to disable the Away Mode. Related articles My lock has an audible alarm after I input the PIN code. Why is Alfred failing to lock? Handing Switch Why does my Alfred not automatically lock after closing the door? What should I do if I forget my Master PIN Code? Comments 0 comments Please sign in to leave a comment.