I am trying to find out what should happen when each of the three positions of the rocker toggle switch are selected on my central so called "gas pump" handle of my central vacuum unit equipped with a power head. When the left toggle is in the down position ONLY the power head works, in the center position nothing works, with the right toggle down ONLY the central vacuum works (draws). Surely the power head and vacuum should come on together. I expect to hear the toggle switch is defective. The toggle switch looks identical to the one in this previous question.