Why does my garage door opener hum but the door won't move?
The opener's motor is getting power but can't move the door. The usual causes are a broken spring that leaves the door too heavy to lift, a stripped gear inside the opener, or a door that is jammed, off its track or locked. A failing motor capacitor can also cause a hum with no movement, mostly in older openers.
What matters most is whether the door lifts easily by hand. If it feels very heavy or won't stay up, the problem is almost always the spring or cables, not the opener, and replacing the opener won't fix it.
Why it happens
A garage door weighs far more than a motor could comfortably lift. Springs, usually a torsion spring above the door or extension springs along the sides, carry most of that weight. When a spring breaks, the opener is left to lift the whole door. It hums, strains and often gives up. You may also have heard a loud bang from the garage earlier, which is a common sign of a snapped spring.
If the door is balanced and moves freely by hand, the fault is probably inside the opener. Many openers use a plastic or nylon drive gear that wears down over the years. When the teeth strip, the motor spins and hums but nothing pulls the trolley along the rail. A worn capacitor or a seized motor can sound similar.
Other causes are simpler. A door bent or knocked off its track, a frayed or slipped cable, a lock bar left engaged, or a trolley that has been disconnected can each stop movement. Cold weather can thicken old lubricant and make a sluggish door or opener hum harder. Salt air can corrode springs and hardware over time and speed up wear.
What you can check yourself
Make sure a manual side lock or lock bar isn't engaged, and that nothing is blocking the door or the photo-eye sensors. Check the wall control for a lock or vacation mode too.
With the door fully closed, pull the red release cord to disconnect the opener. Then lift the door a little by hand. If it's very heavy or drops when you let go, stop and leave it alone.
Look for a door sitting crooked, a gap in a torsion spring, a loose cable or a bent track. Springs, cables and the brackets holding them are under high tension and shouldn't be adjusted by a homeowner.
If the door moves freely by hand and the motor hums or whirs without the trolley moving, a stripped gear or failed motor part is likely. Plastic shavings on the rail or floor point the same way.
Don't stand under a door that is partly open, and keep kids and pets away. A door with a broken spring can drop or slam shut without warning.
When to call a pro
Call a pro if the door is heavy, you see a gap in the spring, a cable is loose, or the door is off its track. Torsion spring injuries and doors slamming shut are the main hazards with this kind of repair, so spring and cable work is best left to someone with the right winding bars and experience. A stripped gear or failed motor part also needs a pro to decide between repairing the opener and replacing it.
Permit and licensing rules for garage door work vary by city and state, and opener replacement or a new door may be affected. Ask the pro, and verify with your local building department if you're unsure. USA Home Repairs is a referral and scheduling service, and we match you with a vetted local pro near you. You get a free estimate and approve the price before any work starts.
What a pro will do
- Diagnose the real cause
The pro checks door balance, springs, cables, rollers, track and opener to find out whether the problem is the door or the opener.
- Replace broken springs and cables
Springs are replaced to suit the door's weight and size, and cables are reseated or replaced. The door is then rebalanced.
- Repair or replace the opener
A worn gear or capacitor may be repairable. If the opener is old or the motor has failed, the pro can explain replacement options.
- Fix an off-track door or damaged panels
The pro realigns the track, replaces damaged panels or rollers, and tests the safety reversal and sensors.
- Tune up the system
Hinges, rollers and moving parts are lubricated, and hardware is tightened and checked for corrosion or wear.
Related questions
Is it safe to open the door manually when the opener hums?
Only if the door is balanced. Disconnect the opener with the release cord while the door is closed and lift gently. If it's heavy or won't stay up, a spring has likely failed, and forcing it can be unsafe.
Do I need a new opener if the door won't move?
Not necessarily. A broken spring is a very common cause, and the opener is often fine once the spring is replaced. A pro can tell you whether the opener also needs repair.
What factors affect the cost of fixing this?
The cause matters most: a spring, cable, gear or whole opener. Door size and weight, spring type, access and any damage found once the door is opened up also play a part. To get a free estimate, call USA Home Repairs and we match you with a vetted local pro near you.
Can cold weather make my opener hum without moving?
It can contribute. Cold thickens old lubricant and stiffens moving parts, so a worn opener or sticking door may struggle more. A tune-up can help, but it won't fix a broken spring.
Want a pro to look at it?
Leave your number and we call you right back to set a time. Every visit is a free estimate, with no obligation, and we'll match you with a vetted local pro near you.
Rather talk to someone? Call (888) 996-7488.