Short answer: A door that starts to close, changes its mind partway, and rolls back up is trying to tell you something specific. The trick is reading which signal it's sending. This guide walks through the handful of causes a technician checks, and the few you can rule out yourself before picking up the phone.
A door that starts to close, changes its mind partway, and rolls back up is trying to tell you something specific. The trick is reading which signal it's sending. This guide walks through the handful of causes a technician checks, and the few you can rule out yourself before picking up the phone.
Two very different reverses — learn to tell them apart
Before anything else, watch the door closely through one failed cycle, because there are really two separate problems that both look like 'reversing.' In the first, the door travels almost all the way down, then shoots back up, and the opener lights flash several times afterward — that flashing is the machine reporting a blocked or misaligned photo-eye sensor. In the second, the door reverses higher up or right as it touches the floor, with no light-blinking, behaving as if it bumped into something solid. That version is a force or travel-limit issue, or a genuine physical obstruction. Knowing which of the two you're seeing narrows the diagnosis from a dozen possibilities down to two or three, and it's the first thing a good tech asks about.
What a technician actually checks
For the sensor-type reverse, a tech confirms both photo eyes are clean, aimed at each other, and showing steady indicator lights, and traces the low-voltage wiring for a coastal-corroded splice or a staple that finally cut through. For the mechanical-type reverse, the checks run deeper: the close-force setting (dialed too sensitive, the opener mistakes normal friction for an obstacle), the down travel limit (set so the door hits the floor and bounces), and the door's own hardware. This is where salt air shows up again — rusted rollers, dry hinges, and pitting on the track create just enough drag that a healthy opener reads it as hitting something and backs off. A weak or failing spring does the same by making the door too heavy for the motor to lower smoothly. A tech isolates it by disconnecting the opener and moving the door by hand to feel for binding.
A few things you can rule out first
You can save yourself a service call, or at least speed one up, by clearing the simple stuff. Sweep the threshold where the door seats — a single pebble, a curled leaf, or a hardened clump of dirt is enough to trigger the reverse. Wipe both sensor lenses and make sure nothing is parked in the beam. Eyeball the tracks for an obviously bent section or a roller sitting off its rail. What you should not do is grab a screwdriver and crank the force or limit adjustment screws by feel — those are calibrated to keep the door from closing on someone, and blindly turning them up trades a minor annoyance for a real safety hazard. If the basics are clean and the door still reverses, that's the point to bring in a technician to set the forces and limits properly.
Frequently Asked Questions
Two very different reverses — learn to tell them apart?
Before anything else, watch the door closely through one failed cycle, because there are really two separate problems that both look like 'reversing.' In the first, the door travels almost all the way down, then shoots back up, and the opener lights flash several times afterward — that flashing is the machine reporting a blocked or misaligned photo-eye sensor. In the second, the door reverses higher up or right as it touches the floor, with no light-blinking, behaving as if it bumped into something solid. That version is a force or travel-limit issue, or a genuine physical obstruction. Knowing which of the two you're seeing narrows the diagnosis from a dozen possibilities down to two or three, and it's the first thing a good tech asks about.
What a technician actually checks?
For the sensor-type reverse, a tech confirms both photo eyes are clean, aimed at each other, and showing steady indicator lights, and traces the low-voltage wiring for a coastal-corroded splice or a staple that finally cut through. For the mechanical-type reverse, the checks run deeper: the close-force setting (dialed too sensitive, the opener mistakes normal friction for an obstacle), the down travel limit (set so the door hits the floor and bounces), and the door's own hardware. This is where salt air shows up again — rusted rollers, dry hinges, and pitting on the track create just enough drag that a healthy opener reads it as hitting something and backs off. A weak or failing spring does the same by making the door too heavy for the motor to lower smoothly. A tech isolates it by disconnecting the opener and moving the door by hand to feel for binding.
A few things you can rule out first?
You can save yourself a service call, or at least speed one up, by clearing the simple stuff. Sweep the threshold where the door seats — a single pebble, a curled leaf, or a hardened clump of dirt is enough to trigger the reverse. Wipe both sensor lenses and make sure nothing is parked in the beam. Eyeball the tracks for an obviously bent section or a roller sitting off its rail. What you should not do is grab a screwdriver and crank the force or limit adjustment screws by feel — those are calibrated to keep the door from closing on someone, and blindly turning them up trades a minor annoyance for a real safety hazard. If the basics are clean and the door still reverses, that's the point to bring in a technician to set the forces and limits properly.
How do I get help with this?
Call (650) 434-4104 and describe the situation, your exact location, and what you need. Timing is confirmed on that call rather than promised in advance.
Call for help: (650) 434-4104 — a straight answer and an honest estimate before any work begins.