A door that starts down and then goes back up is not broken in the way most people assume. In almost every case it is a safety system doing its job on bad information, and the useful clue is exactly when it reverses.
It reverses immediately, before it moves much
That is the photo eyes, the two small sensors near the floor on each side of the opening. Something is breaking the beam, or the opener thinks something is.
Look at the indicator lights on both units. One is usually a steady light and the other blinks or goes out when the beam is broken. If one is dark or flickering, that is your answer.
The usual causes, in the order we find them:
- A bag, a bike tire, a trash can, or a coiled hose sitting in the beam. Free fix, and it happens constantly.
- A lens covered in dust, cobwebs, or grass clippings. Wipe both with a dry cloth.
- A bracket knocked out of alignment. They are held by a wing nut and a bumped one will drift over months.
- Direct sun hitting the receiving lens. If your door only misbehaves in the late afternoon, this is almost certainly it, and a small sun shield fixes it.
It reverses right as it touches the floor
This is usually the down travel limit. The opener is set to drive the door slightly past where the floor actually is, so when the door lands, the opener reads the resistance as an obstruction and backs off.
Slabs move here. A limit that was correct when the opener went in can be wrong a few years later without anybody touching it. The adjustment is a screw or a button on the opener depending on the model.
It reverses partway down, at no particular spot
Look at the door before you look at the opener. Something is adding resistance mid-travel: a bent track, a roller that has come out or seized, or a hinge that is binding.
Pull the red release cord and move the door by hand. If it sticks or gets heavy at the same spot it reverses, you have found it, and it is a door problem rather than an opener problem.
It reverses at the same spot every single time
That specificity is a gift. A repeatable stopping point is mechanical almost without exception. Look at the tracks at that height for a dent, a loose bracket, or a splice where two track sections meet.
The thing not to do
There is a force adjustment on every opener, and turning it up will absolutely stop the door reversing. It will also disable the only thing standing between the door and whatever is under it.
Those settings exist to be tuned after the mechanical problem is fixed, not to overpower one. If somebody suggests cranking the force up so the door stops being fussy, get a second opinion. A garage door is the heaviest moving object in most houses.
What we check when we come out
We balance the door first, because an unbalanced door makes every other symptom worse and hides the real cause. Then sensors, then limits, then force, in that order. We find the cause and restore reliable operation rather than turning a setting up until the symptom goes away.
The short version
Reverses instantly means sensors. Reverses at the floor means the down limit. Reverses partway means something mechanical in the door. Reverses at the same spot every time means look at the track right there.
If you work through it and it still will not behave, call (817) 789-7039 or send us a message. North Richland Hills and the mid-cities, usually same day.