If your Mortise is not locking, it may be due to the following:

• Sensor/Timer Re-lock is disabled
• The door sensor on the Mortise and door frame magnet are misaligned
• Low battery or wrong batteries used

If you have disabled all Re-lock Modes, you can lock the door with '#' key on the Mortise from outside the door, and Open/Close or Thumbturn from inside the door.