On my 275 Contemporary, after the lock has been working normally, the latch bolt locks up and the turnpiece will not rotate.
Enter your Programming Code. Press enter arrow. You will hear one beep. Press 0. Press enter arrow. You will hear two beeps.
The latch bolt will extend and retract to learn the orientation of the door. If successful, you will hear 2 beeps. If unsuccessful, you will hear 3 beeps (make sure the door is open and unlocked and that you are using a fresh set of batteries).