Short answer: A door that heads down and then rolls right back up, or refuses to close at all, is usually your opener's safety system doing its job — which means the fix is often something you can spot in a few minutes before deciding whether to call. Here's how to read the signals in order.
A door that heads down and then rolls right back up, or refuses to close at all, is usually your opener's safety system doing its job — which means the fix is often something you can spot in a few minutes before deciding whether to call. Here's how to read the signals in order.
Start with the photo-eye sensors near the floor
Since the early 1990s, every opener has a pair of small sensors mounted a few inches above the floor on each side of the door, connected by an invisible infrared beam. If anything breaks that beam — or if the two eyes aren't pointed at each other — the opener refuses to close as a safety measure, and many models flash the opener light or blink an LED on the sensor to tell you so. Look for the obvious first: a trash can, a coiled hose, a stray leaf pile, or even a cobweb hanging across one eye. Then wipe both lenses with a soft cloth, because on doors near the bay a film of dust and damp grime builds up and quietly blocks the beam. Finally, check that a bumped bracket hasn't knocked an eye out of alignment; the indicator lights on the sensors should be steady, not flickering, when they're properly aimed at each other.
When it closes then reverses: travel limits and force settings
If the sensors are clean and aligned but the door touches down and immediately climbs back up, the opener likely thinks it hit an obstruction. This traces back to two adjustable settings on the motor unit: the travel limit (how far the opener believes the door needs to move to reach the floor) and the force setting (how much resistance it tolerates before reversing). If the close-limit is set too far, the door bottoms out and keeps pushing, so the opener reads that resistance as a collision and reverses. Cold, swollen weather stripping or a door that's binding in the tracks can trigger the same false alarm. Most units have labeled adjustment dials or buttons for these limits, and the owner's manual walks through the sequence — but if adjusting them doesn't hold, the underlying cause is often mechanical friction in the door itself rather than the setting.
The mechanical causes a technician should handle
When the door physically resists closing — dragging, catching, or sounding rough on the way down — the reversing is a symptom, not the disease. A technician will check for dry or seized rollers, a track that's drifted out of alignment, hinges stiff with corrosion, and springs that have lost tension and left the door too heavy for the opener to lower smoothly. They'll also test the door's balance by disconnecting the opener and moving it by hand, which instantly separates an opener-settings problem from a hardware problem. If you've cleaned the sensors, cleared the path, and the door still won't stay closed, that's the point to bring in a pro rather than keep re-adjusting limits — a door that won't secure is one you can't leave the house behind, and the real fix is usually a 10-to-15 minute tune-up of the hardware.
Frequently Asked Questions
Start with the photo-eye sensors near the floor?
Since the early 1990s, every opener has a pair of small sensors mounted a few inches above the floor on each side of the door, connected by an invisible infrared beam. If anything breaks that beam — or if the two eyes aren't pointed at each other — the opener refuses to close as a safety measure, and many models flash the opener light or blink an LED on the sensor to tell you so. Look for the obvious first: a trash can, a coiled hose, a stray leaf pile, or even a cobweb hanging across one eye. Then wipe both lenses with a soft cloth, because on doors near the bay a film of dust and damp grime builds up and quietly blocks the beam. Finally, check that a bumped bracket hasn't knocked an eye out of alignment; the indicator lights on the sensors should be steady, not flickering, when they're properly aimed at each other.
When it closes then reverses: travel limits and force settings?
If the sensors are clean and aligned but the door touches down and immediately climbs back up, the opener likely thinks it hit an obstruction. This traces back to two adjustable settings on the motor unit: the travel limit (how far the opener believes the door needs to move to reach the floor) and the force setting (how much resistance it tolerates before reversing). If the close-limit is set too far, the door bottoms out and keeps pushing, so the opener reads that resistance as a collision and reverses. Cold, swollen weather stripping or a door that's binding in the tracks can trigger the same false alarm. Most units have labeled adjustment dials or buttons for these limits, and the owner's manual walks through the sequence — but if adjusting them doesn't hold, the underlying cause is often mechanical friction in the door itself rather than the setting.
The mechanical causes a technician should handle?
When the door physically resists closing — dragging, catching, or sounding rough on the way down — the reversing is a symptom, not the disease. A technician will check for dry or seized rollers, a track that's drifted out of alignment, hinges stiff with corrosion, and springs that have lost tension and left the door too heavy for the opener to lower smoothly. They'll also test the door's balance by disconnecting the opener and moving it by hand, which instantly separates an opener-settings problem from a hardware problem. If you've cleaned the sensors, cleared the path, and the door still won't stay closed, that's the point to bring in a pro rather than keep re-adjusting limits — a door that won't secure is one you can't leave the house behind, and the real fix is usually a 10-to-15 minute tune-up of the hardware.
How do I get help with this?
Call (650) 416-1411 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) 416-1411 — a straight answer and an honest estimate before any work begins.