If the door stops and reverses near the bottom the problem may lie with the safety sensors.
Garage door not closing totally on one sid.
They both have lights and both lights should be on.
Side mounted extension springs are installed above the horizontal roller tracks on both sides of the door.
Check the sensors one on either side of the opening and look for anything that may obstruct them.
All you will have to do in this case is readjust the sensors to allow the garage door to fully close.
The extension springs are evenly matched and installed to keep the garage door properly aligned so that it runs smoothly throughout the entire length of the track and closes evenly.
If your door has a gap.
There is one on each side of the door.
If you need to change their tensions move them to a new hole.
Depending on the brand.
2 the safety sensors for your garage door located near the floor on each side of the garage on the tracks may have become out of alignment.
A roll up door also has springs on each side that is controlled by a pulley.
Your garage door opener may tell you this by showing a blinking light.
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.
Springs are one of the main causes of malfunctioning garage doors.
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.