As soon as the dryer stops, the push-to-start switch would need to be tested for 120VAC at the light blue wire going to the motor to the white wire at the timer terminal S. If there is voltage, the timer is sending voltage out properly and the motor would be the cause of failure. If there is not voltage, the light blue wire at the timer would need to be tested for 120VAC to the white wire at the timer. If there is not voltage here, the timer would be the cause of failure. This is based on the unit being thoroughly clean all throughout the cabin.