Opener hums but the garage door does not move
An opener that hums but will not lift the door can mean a broken spring, a lock or a worn opener part. What you can check by eye and what to leave alone.
When the opener hums and the door stays put, the motor is running but the door is not responding. The cause can be as simple as a lock or as serious as a broken spring. Do not keep pressing the button, and do not lift the door by hand to test it.
Stop pressing the button
A humming opener can mean a broken spring
Chamberlain's support page lists a possible broken spring as one cause of a brief hum with no door movement, and says to contact a trained door technician. Do not keep running the opener, and do not try the door by hand or with the release handle to see how heavy it is. A door with a broken spring is heavy and can drop. One door manufacturer warns that using an opener with a broken spring can burn out the motor gears.
Keep people and pets clear of the door. Do not touch the springs, cables, brackets or bottom fixtures.
What a hum can mean
Chamberlain's support page for chain, belt and screw drive openers lists several causes, depending on how long the hum lasts and what you can see. Other brands vary, so check your model's manual.
| What you notice | Possible cause listed by Chamberlain | Who handles it |
|---|---|---|
| Brief hum, door does not move | A broken spring | Technician. Do not test the door. |
| Brief hum, door does not move | The door lock is engaged | You can check the lock if the door shows no damage |
| Brief hum, door does not move | Trolley stuck on the stop bolt or stop tab | Follow your manual, or bring in a technician |
| Hum for about 30 seconds, door not moving | The door is not connected to the opener | Technician if there is any doubt about the door's condition |
| Hum for more than 5 seconds on a screw drive | Stripped rack | Technician |
| Brief hum, capacitor or motor trouble | Capacitor, motor or logic board fault | Technician. Disconnect power before any service. |
Chamberlain also says to disconnect all electric and battery power before performing any service or maintenance.
What you can safely check
Do these from the floor, with the door at rest. They require no tools and no door movement.
- Look at the door and its hardware. Is it level, on its track, with no gap in a spring and no frayed cable? If anything looks wrong, stop here and bring in a technician.
- Remember what happened. Did you hear a bang before the hum began? That points to a spring. See signs a spring is broken.
- Check whether the door lock is engaged, if your door has one. Chamberlain lists an engaged door lock as a cause of a brief hum. Do not force a lock on a door that looks damaged.
- Look at the opener for a wall-control lock mode, and check your model's manual for what its lights and sounds mean.
- Note how long the hum lasts and whether the opener light flashes. See why the opener light blinks. Check your model's manual for what blink patterns mean on your opener.
Do not pull the emergency release handle to test the door. Releasing the door from the opener can let a door with a broken spring fall. If the door is not connected and the release has already been pulled, leave reconnecting it to a technician when the door's condition is not clear. See how to use the manual release safely.
When to stop and bring in a technician
- You heard a bang before the hum, or the door feels heavy or uneven.
- You can see a gap in a spring, a frayed cable, or a crooked door.
- The opener hums for more than a few seconds and the door does not move.
- You see oil or swelling inside the opener, or the opener keeps humming until it is unplugged.
- The door has come off its track. See garage door off its track.
- You are not sure whether the door is safe to run.
Our technicians inspect the door first, confirm the cause, and repair the spring, cable or opener part at fault. See opener repair, spring replacement and garage door repair.
Spring and cable work is technician work
DASMA says spring systems should be repaired only by trained professionals, and that lift cables and spring-connected brackets are under extreme tension. Do not attempt to fix a stuck door by adjusting them.
Why a spring is the first suspect
The springs carry nearly all of the door's weight. The opener is built to guide a balanced door, not to lift a full-weight one. When a spring breaks, the motor can run and the door will not move, or it strains and stops. That is why a hum plus a bang, a heavy door or a visible coil gap should be treated as a spring failure until a technician says otherwise. For how balance works, read how a door stays balanced. If you have two springs and one broke, DASMA advises replacing both.
Related services
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Need a technician?
If something on your door looks damaged, stay clear and let a technician handle it.
Questions and answers
Why does my opener hum but the door won't move?
Chamberlain lists a broken spring, an engaged door lock, a trolley stuck on a stop bolt or tab, a door not connected to the opener, and worn or failed opener parts. Check your model's manual. If a spring may be broken, stay clear and call a technician.
Can I pull the release cord and lift the door by hand?
Not if you suspect a broken spring. The door can be very heavy and can drop. Leave it and have a technician inspect it.
Is humming a sign that the opener motor is bad?
It can be. Chamberlain lists motor, capacitor and logic board faults among the possible causes, along with door-side causes such as a broken spring. A technician rules out the door first, because a broken spring is a safety problem.
Can an opener be damaged by running it on a broken spring?
Overhead Door warns that using an opener with a broken spring can burn out the motor gears. Stop using the opener until the door has been inspected.
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