Garage Door Will Not Stay Closed
A door that reaches the floor and reopens may be responding to an obstruction, safety sensor, travel setting, floor resistance or mechanical binding. Clear obvious objects only when the door is stable, never bypass safety devices and stop testing if movement is uneven.
Observe where reversal begins
A door that reverses before touching the floor presents a different clue from one that contacts the floor, compresses the seal and then reopens. Note the position and any opener indicator or light pattern.
The threshold can change with weather
Ice, packed debris, a swollen bottom seal or an uneven threshold can add resistance. Remove loose debris only without placing hands or tools beneath a moving door.
- Ice or gravel at the threshold
- Seal folded under
- Door rubbing a jamb
- Photo-eye indicator changes
Safety features should remain active
Do not tape sensors, increase closing force to overpower resistance or repeatedly hold a control to force closure. Service should restore the cause and verify normal reversal behavior.
Questions about this problem
Can sunlight affect photo eyes?
Strong light can contribute on some systems, but alignment, wiring, contamination and mechanical resistance should also be checked.
Why does it close only when I hold the wall button?
Some openers use constant-pressure close behavior when the photo-eye circuit has a fault. Follow the manual and have the safety system restored.
Can a new bottom seal cause reversal?
A seal or threshold change can alter the closed position. Travel should be set to the actual door and floor without excessive compression.
Why does my garage door reopen right after closing?
The most common cause is the photo-eye safety sensors seeing an obstruction — misaligned, dirty, or blocked — so the opener reverses as it is designed to. Other causes are a travel or limit setting telling the opener the door has not closed, or a real obstruction in the track. The blinking opener light usually points at the sensors.
How do I check the safety sensors?
Look at the two sensors near the floor on each side of the opening. Most have indicator lights; a steady light on both usually means aligned, and off or flashing means not. Gently wipe the lenses and check nothing is leaning in the beam. Do not attempt to rewire or bypass them.
Can I stop the door reopening by disabling the sensors?
No — the photo eyes are the entrapment-protection system and defeating them removes the protection that stops a door closing on a child, pet or obstruction. A door that will not stay closed because of the sensors has the sensors fixed, never bypassed.
Why does it happen only sometimes?
Intermittent reversal often means a marginal cause — a sensor slightly out of alignment that the sun or vibration tips over the edge, condensation on a lens in certain conditions, or a loose wire that connects and disconnects. Intermittent faults are real faults; they are just harder to catch, so noting when it happens helps.
Could a travel setting be the problem?
Yes — if the down-travel limit is set wrong, the opener can decide the door has hit an obstruction before it reaches the floor and reverse. Limit settings drift and change after a door is worked on, and they are adjusted to the door rather than assumed correct.
Does cold weather cause a door to reopen?
It can — a partly frozen threshold or stiff cold hardware adds resistance the opener reads as an obstruction, and condensation or frost on a sensor lens breaks the beam. A door that only reopens in the cold often has a friction or sensor-lens issue rather than a persistent fault.
Is a real obstruction possible?
Yes, and it is worth checking — a bin, a bike, a coiled hose, or debris in the track can genuinely block the door or the beam. Clearing the opening and the track is a quick first step before assuming a sensor or setting fault.
Why does the opener light blink when this happens?
Many openers use a blinking light as a deliberate diagnostic, and a sensor fault is the most common thing it signals. The blink pattern differs by brand and the manual decodes it — so a blinking light plus a door that will not stay closed is very often the same single sensor problem.
When should I stop using the door?
If the door is closing unpredictably, slamming, or reversing in a way that looks uncontrolled rather than the clean reversal of a working safety system, stop using the automatic close and request service. A reliable reversal is the safety system working; erratic or violent behaviour is not.
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