Yes, I know that the constant jam (as opposed to 8/4 second jam modes) setting on the AL 8.0 has been discussed before--
I keep trying to enable the constant jam option (21 blinks), but I get nothing. I've changed other settings (the parking mode from regular to short), so I know that the control box is working.
I've got the 17.01 firmware box (newest is the 17.21 with the option to 'turn off' the parking sensor'). I the ordered unit about September of last year.
I also remember there being a poor side effect of having constant jam... or I am just making that up??