Check the center roller it could be worn, does this sliding door makes loud grinding noise when opening and closing? If not I have seen water damage the slider control module. Here are some diagrams so you can see how the system works.
Check out the diagrams (Below)
Please let us know what you find. We are interested to see what it is.
Images (Click to enlarge)
Monday, February 2nd, 2015 AT 12:06 AM