[RMcNeal]

Make sure there are no obstructions blocking the slide.
You can do a manual override on the schwintek slides by pushing the button on the controller 6 times then holding it for the 7th time until the red light flashes. This override ignores the hall sensors on the contoller and will just run the motors until your slide is fully extended or retracted (as long as both motors are working).
You should be able to find the controllers in the storage bay beneath the living room slides. Mine are mounted on the ceiling of the rear baggage compartment below each slide. The controller will have a small window which contains a red LED and small green button. Use a small pen or screwdriver to push that button 6 times then hold on the 7th to get into override mode.