If this is a torsion spring system either a cable has come off the high taper of one of the drums or one of the drums has slipped on the torsion tube and needs to be reset by a professional.
Garage door not closing evenly.
There are several things that can cause this.
Without the springs the door is very difficult to lift.
First check the sensor lights.
This can happen when the door has shifted to one side causing it to appear uneven.
When garage doors won t close all of the way or they close unevenly spring adjustment may be called for.
The most likely cause of that is that the springs that help lift the door and prevent it from closing to fast need to be adjusted or replaced.
Keep the door open a few feet off the ground as this takes the pressure off the door springs.
Put a ladder under the door to make sure it won t close accidentally while you re working on it.
Garage door springs are used to offset the weight of the door.
Do not attempt to do this yourself.
Some times you need to adjust the garage door.
Adjusting garage door extension springs.
If you suspect you need to adjust one or both of the extension.
In order to fix this you ll want to make small changes to the close limit setting until the door opener knows to stop once the door has reached the floor.
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.
If your door has a gap on one side or the other when it s closed the problem is most likely due to a break or other issue with one of the extension springs.
The most simple and common is door shift.
Depending on the brand.
When this happens you need to shift it back into position.
If your garage door is closing fully and then reversing to open again then it may be due to a problem with the close limit switch.
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.