One of our most frequent calls for service is for Top-Down/Bottom-Up shades or DuoLite shades that no longer lower all the way. Fortunately, this is avoidable if the shades are properly operated.
Normally, to operate Top-Down/Bottom-Up shades or DuoLite shades, the right cord operates the center rail and the left cord operates the bottom rail. IMPORTANT: You must first lower the bottom rail before lowering the center rail. Likewise, you must first raise the center rail before raising the bottom rail. This specific sequence is to avoid creating slack in the lifting cords that can tangle or knot inside the headrail and cause the shade to be inoperable. If the shade is a cordless style the rails must be raised in the same sequence as corded shades.
For instance, if you lower the bottom rail to the sill and then lower the center rail part way down you need to raise the center rail all the way up before you raise the bottom rail to the top of the window. If you raise the bottom rail to the top of the window while not raising the center rail, slack will form in the cords that lift the center rail. These cords can then tangle, often inside the headrail where you cannot see them and the next time you try to lower the shade it will not lower all the way.
Proper operation of Top-Down/Bottom-Up shades or DuoLite shades will prevent service calls and frustration with the products repaired by or purchased from The Blind Alley.