Vertical blinds are a versatile window product because of the ability to open, close and adjust the slats, also called vanes, for light control. Many of the newer verticals on the market today come with a self adjusting mechanism, where if the blind gets out of alignment, you can pull the slats to one side and it will adjust on it's own. Occasionally it does not adjust on its own or the vertical may be an older model and not include the self adjusting feature at all. When a vertical does not adjust, many times slats can pop off or the blind gets completely stuck or twisted and won't open.
Things You'll Need
Flat object (like a credit card)
Remove the slat from the hook if it is out of alignment by taking a flat object like a credit card and pushing it up into the hook to release the slat.
Pull the chain so that the carrier stem will line up all of the hooks. If a hook is not rotating, grab the individual hook and rotate it manually to line up with the rest of the hooks. An out-of-alignment hook is the most common reason why a vertical blind won't adjust.
Reattach the slat by pushing the slat up into the newly aligned hook. Open and close the vertical blinds with the chain. The adjustment problem should be resolved.
Sometimes the hook gets damaged and requires replacement to line the vertical up again. You can easily remove the hook with pliers and replace it with a new one.
If your vertical is new and it still is not adjusting, send it back to the manufacturer for a new vertical. The vertical should still be under warranty.