Why won't my garage door close?

Common reasons include: misaligned safety sensors, obstructions in the door path, broken springs, stripped gears in the opener, or issues with the close limit settings. Check the safety sensors first - they should both have steady lights.

Should I repair or replace my garage door?

Consider replacing if: the door is over 15-20 years old, has significant rust or structural damage, panels are severely damaged, or you want to upgrade to an insulated door. Many issues like springs, cables, sensors, and openers are cost-effective to repair.

What do the blinking lights on my garage door opener mean?

Blinking lights indicate error codes. For LiftMaster/Chamberlain: 1 blink = sensor wire issue, 2 blinks = sensor wire short, 3 blinks = door control wire issue, 4 blinks = sensor misalignment, 5 blinks = motor issue. Use our error code lookup tool for specific diagnosis.

How do I calculate what torsion spring I need?

To calculate the correct torsion spring, you need: door height, door width, door weight, track type, and number of springs. The formula involves IPPT (Inch-Pounds Per Turn) = d^4 × E / (10.8 × D × Na). Use our spring calculator for accurate results.

Can I replace a garage door spring myself?

Torsion spring replacement is dangerous and recommended only for trained professionals due to the extreme tension (over 200 lbs of force). Extension springs are safer for DIY but still require proper safety precautions and tools.

Garage Door Opens By Itself

DIY Friendly15-45 minutes

A garage door that opens by itself is usually caused by a stuck wall button, a remote with a stuck button (often in a drawer or car), radio frequency interference, or damaged wiring. Start by removing batteries from all remotes to see if the problem stops.

Common Symptoms

Door opens when no one pressed a button
Door opens at random times
Door opens in the middle of the night
Opener activates without any input

Possible Causes

•Stuck or shorted wall button
•Remote with stuck button in car or drawer
•Radio frequency interference
•Damaged wiring between button and opener
•Neighbor's remote on same frequency (older openers)

How to Fix It

Remove batteries from all remotes

Take the batteries out of every garage door remote you own. Wait 24 hours to see if the problem continues.

Check for stuck remote buttons

Examine all remotes for buttons that feel stuck or mushy. Check remotes in cars, drawers, and bags where items might press the button.

Inspect the wall button

Press the wall button—does it stick or feel different? A stuck button continuously sends the signal to operate.

Disconnect wall button wires

At the opener unit, disconnect the two wires from the wall button terminals. If the problem stops, the button or wiring is faulty.

Check wiring for damage

Inspect the low-voltage wires running from the opener to the wall button. Look for staples through the wire, rodent damage, or bare spots.

Change the opener code

Reprogram your opener and all remotes with a new code. This eliminates radio interference from neighbors or other sources.

When to Call a Professional

•Problem continues after all troubleshooting
•You have an older dip-switch opener (pre-1993)
•Wiring needs replacement in walls
•You suspect a circuit board issue

Frequently Asked Questions

Can my neighbor accidentally open my garage door?

With modern rolling-code openers (post-1993), it's virtually impossible. Older dip-switch openers could potentially be triggered by a neighbor with the same code setting.

Is someone hacking my garage door opener?

Extremely unlikely with modern openers. Rolling codes change with every use and are nearly impossible to hack. The cause is almost always a stuck button or wiring issue.

Should I worry about security?

Yes—a door opening on its own is a security risk. Don't ignore it. Until fixed, manually lock the door from inside using the slide lock on the track.