Try unlatching the door with the pull rope.
Exercise the door up and down a few times and try to detect any binding.
If binding is felt, correct the cause. If no binding is felt do as suggested and adjust the sensitivity.
Before you try any of these tips, wipe the floor mounted sensors with a tissue. Mine looked fine but doing this once fixed it for me.
Also...if it makes it down almost the way and reverses, make sure the yellow nylon rope (used to lift the door manually) is tucked behind the ribbing. If it's hanging down it will break the sensor beam when the door is closing.
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