Customer Questions and Answers for Dryer Timer Resistor by Ge

Irvin, This issue would most likely be caused by a faulty contact in the timer and would need to have the timer replaced.

Irvin, It's most likely an "auto advance" selection that is not working properly. But since all the other cycles work, you need to check the venting and vent hood, A air flow problem could cause the thermostat to cycle improperly and not supply power to the timer motor and it won't advance and shut off. It could be a weak or faulty thermostat as well, but we'll know better, once we know what cycle is malfunctioning, and if cleaning the venting and hood helps to solve the problem.