A roll up door also has springs on each side that is controlled by a pulley.
Garage door will not close completely.
If you can t find any other reason that the door won t close check the alignment of the side tracks.
Side mounted extension springs are installed above the horizontal roller tracks on both sides of the door.
Clutter or obstructions that block the sensor are the first problems to look for if your door won t close or in extreme cases open at all.
Check your garage floor and the area surrounding it for any objects or debris that might be causing the improper close.
If you need to change their tensions move them to a new hole.
There should be 1 2 to 3 4 inch of.
But when your garage door opener fails to close completely if you don t figure out the problem you ll soon be back to the old fashioned way of opening and closing the garage door.
Something blocking the door.
First check the sensor lights.
Problem 2 lack of lubrication.
If one side of the door is not in line with the other the door won t run smoothly in its tracks and when closed one side of the door won t close completely leaving an open gap.
If you find that your garage door is indeed correctly responding to your garage door opener but is simply refusing to shut properly maybe it s descending very slowly getting stuck or making a terrible noise every time it opens or closes it may be in adequately lubricated.
Though this problem should be obvious it shouldn t be overlooked.
Springs are one of the main causes of malfunctioning garage doors.
One of them may be slanted toward the door and binding it.
Adjust them until the door is working properly again.