The appts. has a pivotally movable flag arm (10). If an accordion jam occurs (40) in the processing path, the flag arm first end (15) is contacted by the paper. The other end (20) of the flag arm swings into a fuser sensor (90) detection range. When the paper continues toward the rollers (70), it presses against a pivotally movable fuser sensor flag (75). It causes the fuser flag lower portion (85) to swing from the fuser sensor (90). The time since the fuser sensor flag was moved from the sensor is calculated. A jam is recognised if the elapsed time is less than a predetermined time. The length of time for a leading and trailing edge of paper to pass a reference point in the processing path is stored (T1). The point in time that the leading edge of the paper forces the fuser sensor flag to activate the fuser sensor is stored (T2). The time elapsed since the second time indicia is stored (T3). If the third time is greater than the first time, a paper jam has occurred. If the third time is less than the first, an accordion jam has occurred.
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