Garage Door Won't Close? Fix It Tonight
- About 10 to 30 minutes
- 6 parts and tools
A garage door that will not close is usually a small problem, not a broken opener. Most of the time it is the safety sensors, something in the way, or a setting that drifted. You can check all of that tonight in about 10 to 30 minutes, and you probably need no new parts at all. Start with the sensors, because they cause this problem more than anything else.
What's probably wrong
The safety sensors are the first suspect. Every modern opener has two small sensors near the floor on either side of the door. They shoot an invisible beam across the opening. If anything breaks that beam, the door refuses to close or it starts down and then reverses. A sensor that got bumped out of alignment, a dirty lens, or a spiderweb across the beam will all stop the door.
Something in the track or the opening is the second suspect. A trash can, a bike tire, a box, or a tool leaning into the doorway can block the beam or the door itself. A small object in the track, like a pebble or a fallen screw, can also stop the rollers.
The door itself is the third suspect. A bent track, a roller that popped out, or a door that is binding on one side will make the opener give up and reverse. The opener is designed to reverse when it meets resistance, so a sticking door looks like a sensor problem at first.
The opener settings are the fourth suspect. Openers have travel limits that tell the door how far down to go, and a force setting that decides how much resistance is allowed. If the travel limit is set a little short, the door stops before it closes. If the force setting is too low, normal friction makes it reverse.
The last suspects are power and the remote. A remote with a dying battery may open the door fine from close range and fail from the driveway. An opener that lost power, or a wall button that is locked, can also leave you stuck.
A broken spring or a snapped cable is the serious cause. You will usually know it because the door feels very heavy, hangs crooked, or you can see a gap in the spring above the door. Do not try to fix springs or cables yourself. That job belongs to a pro.
Fix it tonight
Stand inside the garage and look at both sensors. They sit near the floor on either side of the door, usually on the track brackets. One sensor has a green light and the other has a yellow or red light when they are working. If either light is off, blinking, or dim, you found your problem area.
Clear the opening completely. Move everything out of the doorway, including things that only stick in a little. Then look in both tracks for pebbles, screws, or debris and pick them out by hand.
Clean both sensor lenses with a soft cloth. Do not use anything rough. Dust, grime, and spiderwebs are enough to break the beam, and wiping them takes seconds.
Realign the sensors. They need to point directly at each other. Loosen the wing nut or bracket screw on the sensor that looks crooked, move it until its light turns solid, and tighten it again. Press the wall button and watch both lights. Solid lights on both sides mean the beam is connected.
Watch the door as it tries to close. If it moves a few inches and reverses, look for where it binds. Check the rollers on both sides and see whether any roller is out of the track or the track looks bent. If a roller popped out, do not force the door. That is a pro job.
Test the door by hand. Pull the red emergency release cord to disconnect the opener, then lift the door halfway by hand and let go. A balanced door stays put. A door that slams down or shoots up has a spring problem, and you should stop and call a pro. Reconnect the opener by pulling the cord toward the door until it clicks back in.
Check the travel limit if the sensors are solid and the door still stops short. On the back or side of the opener motor unit there are usually two adjustment screws or dials marked for up and down travel. Turn the down travel screw a quarter turn at a time, then test the door. Small adjustments only. Your opener manual has the exact location, and if you do not have the manual, look up the model number on the motor unit.
Try the wall button instead of the remote. If the wall button works and the remote does not, replace the remote battery. If neither works and the opener has no lights at all, check the outlet it is plugged into and the breaker for the garage.
Check the lock feature on the wall button. Some wall buttons have a lock or vacation button that disables the remotes. If it is lit or pressed in, press it again to unlock, then try the remote.
Once the door closes fully, run it up and down twice. Listen for grinding or scraping. A smooth, quiet run means you are done. If it still reverses at the same spot every time, note exactly where it stops, because that detail helps a pro diagnose it fast.
Parts and tools
When to call a pro
Call a pro if the door feels very heavy when you lift it by hand, if it slams down or shoots up on its own, or if you can see a broken spring or a loose cable. Call a pro if a roller is out of the track, the track is bent, or the door hangs crooked. Call a pro if the opener motor hums or grinds but the door does not move, or if the opener is completely dead after you confirmed the outlet has power. Springs and cables are under high tension and can cause serious injury. That is not a tonight job, and no video makes it one.
What a pro typically costs
These are broad typical ranges, not quotes. Your area and your door size will change the number. A sensor replacement usually runs about 100 to 200 dollars installed. A spring replacement usually runs about 200 to 350 dollars. A full opener replacement usually runs about 400 to 700 dollars including the unit and labor. A service call to diagnose a problem usually runs about 75 to 150 dollars, and many companies apply that fee to the repair if you go ahead.
FAQ
Why does the door start to close and then go back up?
That is almost always the safety sensors or something binding in the track. The opener reverses on purpose when it thinks something is in the way. Check the sensor lights first, then look for obstructions and binding.
Can I just hold the wall button down to force it closed?
Holding the wall button down will often override the sensors and close the door, but it is a workaround, not a fix. It also means the safety system is not working, which is a real hazard for kids, pets, and anything in the doorway. Fix the sensors instead, and use the override only once, to get the door closed for the night, if you must.
Do the sensors have to be at a certain height?
They are normally mounted low on each side of the door, near the floor, so the beam crosses the opening where a child, pet, or object would be. Do not move them up high to get around a problem. That defeats the safety purpose, and a pro or inspector will flag it.