Short answer: If your opener hums but the door doesn't move, stop pressing the button. Check that the slide lock is open and nothing is jammed in the track. Watch whether the trolley on the rail moves. If the motor runs but nothing moves, a gear inside may be worn out. If the door won't lift, a broken spring is a common cause. Both need a professional.
You press the button, the opener hums or whirs, and the door just sits there. It's one of the more common opener complaints. The sound is the motor trying to work. The question is what's stopping it.
An opener that hums without moving is under strain. Pressing again and again can overheat the motor or damage parts that were still fine, and it can leave a door that's stuck halfway in a worse spot. Press once more only after you've checked the easy things below. If it still just hums, unplug it.
Have someone press the wall button while you stand to the side and watch the opener rail, the long track that runs from the motor toward the door. The part that slides along it is the trolley. What it does tells you a lot. Keep your hands, hair and loose clothing away from the rail and chain while it runs.
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A broken spring is one of the most common reasons an opener hums and can't lift the door. The opener is built to guide a balanced door, not to lift its full weight. Look at the springs from a distance. A gap in the coil above the door, or a loose or stretched spring along the side tracks, means stop. Don't lift the door by hand and don't keep running the opener. Our spring warning signs show what to look for.
If the door is unlocked, connected and clear, and the springs look fine, the problem is likely inside the opener.
Don't open the motor housing. There are electrical parts inside, and opener repairs are best left to a pro. If the opener is getting older, ask whether a repair makes sense or whether it's time for a new one. Our guide on whether to repair or replace your opener can help, and our post on how long springs and openers last gives some context.
When you call, describe what the trolley did, whether you heard a bang before the trouble started, and roughly how old the opener is. Mention any blinking lights on the opener too. That helps the pro come prepared, and it gives you a clearer picture of whether a repair makes sense or the opener is near the end of its life.
If the door is fully closed, the springs look fine and you need to get out, you can pull the release and lift the door by hand. It should lift with steady, moderate effort. If it feels very heavy, stop and lower it gently. That's the springs telling you something, and it's time to call a professional.
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The door has been disconnected from the opener, usually because someone pulled the release cord. With the door fully closed, reconnect it the way your manual describes, then run it once while you watch.
Yes. Without the spring, the opener is trying to lift the full weight of the door, which it isn't built to do. It may hum, strain, or lift the door a little and stop.
Yes. Repeated tries can overheat the motor or damage parts. Press once, check the easy causes, and unplug it if it still only hums.
If you hear the motor running but the chain, belt or trolley doesn't move, a worn gear inside the opener is a likely cause. That's a job for a professional.