When a garage door closes then immediately reopens, the issue is often related to the extension spring system losing tension or becoming unbalanced. This failure prevents the door from staying closed because the springs can no longer counteract the door’s weight, causing the opener to detect resistance and reverse the door as a safety feature. Understanding how extension springs work and what goes wrong helps you determine whether you can safely inspect the system or need professional help.
How Extension Springs Work on a Garage Door
Extension springs run parallel to the horizontal tracks on each side of the door. When the door is open, the springs are stretched; when the door closes, they contract, storing energy to help lift the door next time. Each spring is anchored at one end to a bracket and connected at the other to a pulley and cable system. Proper tension ensures the door moves smoothly and stays in position when closed. If one spring loses tension or breaks, the door becomes unbalanced, triggering the opener’s safety reversal.
What Happens When the Door Closes Then Reopens
As the door nears the closed position, the motor expects minimal resistance. If an extension spring is weak, broken, or detached, that side of the door sags or drops suddenly. This creates uneven drag on the cables and rollers, which the opener interprets as an obstruction. In response, the motor reverses direction to prevent damage or injury, causing the door to reopen. You may hear a loud snap (if a spring broke), see one side of the door hang lower, or notice the door jerking or stalling before reversing.
Signs of a Failing Extension Spring System
Look for visible gaps in the spring coils, rust, or deformation. A broken spring will often be in two pieces with a clean separation. Listen for creaking, groaning, or uneven movement during operation. Manually lift the door halfway (after disconnecting the opener) — if it doesn’t stay put or one side sags, the springs are unbalanced. Never attempt to adjust or remove springs while under tension; the stored energy can cause severe injury if released unexpectedly.
What You Can Safely Check Yourself
You can inspect the springs for visible damage, check that the safety cables (running through the center of each spring) are intact and properly anchored, and ensure the pulleys and cables are not frayed or off-track. Disconnect the opener and manually operate the door to feel for resistance or imbalance. If the door feels heavy, uneven, or won’t stay in place, stop and contact a technician. Lubricating rollers and hinges is safe, but do not touch the spring adjustment points.
Why DIY Spring Repair Is Dangerous
Extension springs store significant force when stretched. Attempting to remove, adjust, or replace them without proper tools and training risks sudden release, which can cause the spring or components to fly apart with enough force to cause serious injury or death. Even if the spring appears broken, residual tension may remain. Torsion springs (mounted above the door) are even more hazardous and must only be handled by qualified technicians. Never compromise safety to save time or cost.
When to Call a Professional
If the door reverses on closing, shows uneven movement, or you suspect a spring issue, contact a garage door specialist. A technician will safely release tension, inspect the entire spring and cable system, replace matched springs if needed, and rebalance the door. They’ll also verify the opener’s force settings and safety sensors are correctly adjusted. Using mismatched or incorrect springs can lead to premature failure or unsafe operation.
Frequently Asked Questions
Can I just replace one extension spring if the other looks okay?
No. Springs should always be replaced in pairs, even if only one appears damaged. Using an old and new spring together creates uneven tension, leading to premature wear, imbalance, and potential failure. Matched springs ensure consistent performance and safety.
How long do extension springs typically last?
Extension springs are rated for about 10,000 cycles (one cycle = opening and closing the door once). Depending on usage, this usually translates to 7–12 years. Rust, lack of lubrication, or extreme temperatures can shorten their lifespan.
Will lubricating the springs fix the reopening issue?
Lubrication helps reduce noise and friction but won’t fix a broken, overstretched, or unbalanced spring. If the door still reverses after lubricating hinges and rollers, the spring system likely needs inspection or replacement.
Up & Down Garage Doors (778) 873-7282