If you stick a finger up elbow does it shut off or keep feeding? It should stop - if not eyes are dirty or knackered. The halo B has anti jam software - if feed cone gets stuck it'll pulse (turn motor on/off) 3 times, before shutting down and flashing green/red LED to indicate a jam. The spring on the drive cone is what controls the force feed - not the software AFAIK.
This is for standard board - aftermarket have more options