You can identify a jammed auger if pellets or other materials stop flowing out of the end, the auger makes loud grinding noises when turned on, the auger motor strains and slows when running, or you visually see a clog or obstruction in the auger flighting. A jammed auger won't turn smoothly when rotated by hand. Removing and thoroughly cleaning the auger is the best way to clear jams and restore proper function.