Garage Door Opener Not Working? A Quick Troubleshooting Checklist

Before you call anyone, it is worth spending five minutes on the obvious. A garage door opener not working usually comes down to one of four things — power, the safety sensors, the remote, or the door itself — and the first three are things you can check safely from the floor.

Work through these in order. If you get to the end and it still will not run, call us and we will come out.

Start with power

It sounds too simple, and it is the cause more often than anyone expects.

• Is the opener plugged in? Ceiling outlets get bumped by ladders and long objects.
• Has the breaker tripped? Check the panel. Garage circuits often share with exterior outlets, so a wet outdoor socket can take the opener down with it.
• Is the light on the unit lit? No light and no motor sound means no power. Light but no movement means power is fine and the problem is elsewhere.
• Is the wall button working? If the wall button runs the door but the remote does not, you have a remote problem, not an opener problem.

Then check the safety sensors

This is the single most common cause we are called out for. Every opener made since the early 1990s has a pair of photo-eye sensors near the floor on each side of the opening. They must see each other or the door will refuse to close.

The classic symptom: the door opens fine, but when you try to close it, it starts down, stops, reverses, and the opener light blinks at you. That blinking light is the opener telling you the sensors are unhappy.

Check for:

• Something in the beam — a bin, a bike, a bag of compost, a broom leaning where it should not be.
• Dirty lenses. Cobwebs and dust are enough. Wipe both gently with a soft cloth.
• Misalignment. Each sensor has an indicator light. Both should be steady. A flickering or dark light means they are not pointed at each other — usually because something knocked one. Loosen the bracket wingnut, adjust slightly until the light goes steady, retighten.
• Direct sunlight. Low winter sun coming straight down the driveway can blind a sensor for twenty minutes a day. If your fault is time-of-day specific, this is why.

Then the remote and keypad

If the wall button works and the remote does not, start with the battery — they last two to three years and fail gradually, so range shrinks before it stops entirely. If a new battery does not fix it, the remote may need reprogramming to the opener, which is a button sequence on the motor unit itself. The procedure differs by brand and model; for the LiftMaster units we install most often, it is in the manual and takes about a minute.

Outdoor keypads have their own quirk: in damp valley weather, moisture gets into the housing and causes intermittent faults. If yours works when dry and not when wet, that is the answer.

Is the garage door opener not working, or is it the door?

Here is the test that tells you the most. Close the door, then pull the manual release cord — the red handle hanging from the trolley — to disconnect the opener. Now lift the door by hand.

It should lift smoothly with moderate effort, and it should stay put when you stop it halfway. If it does, the door is balanced and your problem is genuinely the opener.

If it is very heavy, will not lift, or slams down when released, stop. That is a spring problem, not an opener problem, and it needs a technician. Do not keep operating the opener against it — you will burn out a perfectly good motor trying to lift a door the springs are no longer supporting. Our post on why spring replacement is not a DIY job explains what is going on there.

Remember to re-engage the trolley afterwards. On most units you pull the cord toward the door and run the opener once, and it clicks back in.

Other things worth knowing

Travel limits. If the door reverses just before it touches the floor, or stops short at the top, the limit settings have drifted. Most units have adjustment screws or buttons on the motor housing.

Grinding with no movement. A motor that runs but does not move the door often means a stripped drive gear — a common wear item on older chain-drive units and a repairable one.

Sudden loud operation. New noise from an opener that was quiet usually means the chain or belt tension has gone, or the rollers are worn. Worth acting on before it becomes a bigger job.

Age. Openers generally last 10 to 15 years. If yours is beyond that and needs a significant repair, a modern belt-drive unit with Wi-Fi and a camera is quieter and more useful than the one you have — and it is a small job compared with a new door.

When to call us

Call us if a garage door opener not working turns out to be the door: if it is heavy by hand, if you can see a gap in the spring above the door, if a cable is loose or frayed, if the opener runs but the door does not move, or simply if you have gone through this list and are out of ideas.

Residential service calls are $150 per hour plus parts. Reach us at 541-342-2823 or garagedoors@crawfordwindor.com, Monday to Friday, 8:30 to 4:30, and see our repairs and maintenance page for the full range of what we handle across Eugene, Springfield and the surrounding towns.