Why won't my garage door stay down after closing?

Few things are more frustrating than a garage door that closes properly and then, without warning, opens back up on its own. The behavior looks random, but it is not. One of a small number of mechanisms is telling the opener to reverse, and identifying which one points you to the fix.

Start with the photo-eye sensors

The first thing to check is the photo-eye sensors. These infrared beam sensors sit on each side of the door opening at 4 to 6 inches above the floor. If anything breaks the beam while the door is closing, or is blocking the beam when the door reaches the closed position, the opener reverses the door back to open.

This is the most common cause of a door that reverses at or near the bottom. A spider web across a lens, a leaf blown in from outside, or a slightly misaligned sensor that is not quite clearing an edge of the door frame can all trigger the reversal. The sensor LEDs tell you a lot: both lights should be steady (green on the receiver, amber on the transmitter). A blinking or dark LED means the beam is blocked or the sensors need realignment.

Clean the lenses with a dry cloth. Check that neither sensor bracket has shifted since installation. Realign by loosening the adjustment nut and rotating the sensor head until the LED goes steady.

Cause	Symptom	Fix
Blocked photo-eye	Door reverses near the bottom	Clean lenses; realign sensors
Close-force too low	Door reverses when it hits the floor seal	Increase close force setting slightly
Down-limit too short	Door stops before fully closed, then reopens	Adjust down-limit setting
Over-tensioned springs	Door springs up after closer; feels light	Spring tension adjustment (technician)
Obstruction in door path	Random reversal mid-travel	Inspect track for debris or damage

Close-force and travel-limit settings

If the sensors are fine, the next step is the opener's down-limit setting and close-force setting.

The down-limit controls how far the door travels before the opener considers the door closed. If the limit is set too short, the door stops slightly above the floor, does not seal, and then the opener may interpret the unsealed position as a problem and reverse. Extend the down-limit in small increments until the door fully contacts the floor seal before stopping.

The close-force setting controls how much resistance the motor will push through before stopping or reversing. This is the same setting you adjust when doing the 2x4 reversal test. If the close force is set too low, the door may reverse when it hits the floor seal or encounters normal friction. Increase the close-force setting slightly, then retest with the 2x4 to confirm the safety reverse still works.

Both settings have adjustment dials or screws on the opener motor head. The location varies by brand. Consult your opener manual or the manufacturer's support site for the specific adjustment method.

Spring tension issues

Over-tensioned springs can cause a door to bounce or rise after it reaches the floor. The springs store more energy than needed to counterbalance the door weight. When the door reaches the down-limit and the opener stops driving, the excess spring tension pushes the door back up.

Test for this by manually lifting the door to mid-height and releasing it. A door that shoots upward when released has more spring tension than needed. A door that stays in place is balanced correctly.

Spring over-tension is a technician repair. Reducing spring tension requires winding bars and experience with high-tension spring systems. Do not attempt to adjust spring tension without proper tools.

Cold weather and the door that reverses more in winter

In Colorado, close-force problems are common in winter. Cold temperatures stiffen the bottom weather seal, making it harder for the door to press down. Cold also makes the door slightly heavier as spring tension changes with temperature. The net effect is that a close-force setting that worked perfectly in October may cause the door to reverse off the stiffened seal in January.

If this happens every winter, the fix is a slight increase in close-force for the winter months, combined with lubricating the weather seal with a silicone spray to keep it flexible. Re-run the 2x4 reversal test after any force-setting change to confirm the safety reverse is still functioning at the new setting. Reset the force to the summer calibration in spring.

If the door reverses only at certain times of day and not others, sunlight may be interfering with the photo-eye. Direct sunlight can overload the receiver and simulate a blocked beam. Shade the receiver with a small hood or adjust the sensor angle slightly downward.

Diagnosing the exact cause with a step-by-step check

A separate but related issue is a door that reverses before fully closing, stopping at 2 to 6 inches above the floor. This is different from a door that closes completely and then reopens. A door that stops short mid-descent is almost always a photo-eye problem: something blocks the beam at that height, or the sensor misaligns enough that the beam clips the door frame as the door descends.

Check the floor near the sensors for small objects. A leaf or pebble below beam height can interrupt the signal as the door reaches that elevation. If the floor is clear, tighten the sensor brackets and ensure the beam clears all obstructions at full descent.

For a door that closes fully and then reopens, work through these steps in order. Each step takes under five minutes.

1. Clean both photo-eye lenses with a dry cloth.
2. Confirm both LEDs are steady. Realign if blinking.
3. Close the door manually with the opener disconnected. If it stays down, the opener settings are the issue.
4. Check the down-limit setting on the opener.
5. Adjust close-force in small increments and retest with the 2x4 board each time.
6. If the door still reverses after all adjustments, check spring tension by doing the balance test.
7. Call a technician if spring tension is the problem.

If you have gone through all seven steps and the door still will not stay closed, the opener's logic board may be the issue. Logic board failures cause unpredictable reversal behavior that does not follow any consistent pattern. A technician can test the board's output and determine whether replacement is needed.

For openers with app connectivity, check the activity log. LiftMaster's MyQ and similar platforms record every door movement. If the log shows a close command followed immediately by an open command within seconds, the opener received an open signal from somewhere. A stuck button on a remote or a wiring short at the wall button can send continuous open signals. Either is a quick fix once identified. Disconnect the wall button temporarily to test: if the door stops reversing with the wall button unplugged, the button or its wiring is the source.

G Brothers Garage Doors serves the Denver metro and Front Range with free estimates, same-day service on opener adjustments and spring work, and 24/7 emergency response. Licensed and insured.