Ah ok i must admit i've never seen an open fault shift register but what you say makes sense. FF being a hexedecimal last number so its logical. You could just pull a 102 wire to simulate a safety fault, Fo2, to prove this theory. As i said if you push the red button to get to the current status on the display, it will tell you what state the lift is in. let me know if you need any other help.
