There may be no power or improper voltage going to the motor. If so, check the Electrical Circuit and Connection Diagram or proper connection of power to controller. Check voltage supply to ensure voltage to motor is 120 or 240 volts as specified for model type.
2.  Your clock motor may be turning but the time dial is not turning. The drive gear located behind the time dial may be broken. If so, remove the time dial and inspect the drive gear. Install a new drive gear noting "this side out." Reinstall the time dial and be sure it turns freely clockwise.