Either the motor is bad or power isn't getting to the motor. If the timer has the motor overheat switch built into it, or the motor itself has the overheat switch built into it that could be bad. The easiest way to test the motor without removing it is to take a 3-prong cord, strip the ends and hook it to the motor according to the wiring diagram (you might need either 1 or 2 wires if the cord, the ground cord is not needed) If the motor doesn't run, then its a bad motor. If it runs, then the problem is in the power feed to the motor, which might be the timer and everything in between.
