Common Motor Problems and Their CausesCommon Motor Problems and Their CausesEasy-to-detect symptoms, in many cases, indicate exactly what is wrong with a fractional-horsepower motor. However, where general types of trouble have similar symptoms, it becomes necessary to check each possible cause separately. Table 9-1 lists some of the more common ailments of small motors, together with suggestions as to possible causes. Most common motor problems can be checked by some test or inspection. The order of making these tests rests with the troubleshooter, but it is natural to do the simplest tests first. For instance, when a motor fails to start, you first inspect the motor connections because that is an easy and simple thing to do.