Start with the symptom
A garage door that will not open can have an opener problem, a broken spring, a disconnected trolley, a locked control, damaged cables, an obstruction, or a door that has moved out of alignment. The symptom matters: silence, humming, a door that rises a few inches, and a crooked door point toward different systems.
Safe checks you can make
Confirm that the opener has power, the wall control is not in lock mode, the remote battery is not depleted, and nothing visibly blocks the door. Look from a safe distance for a gap in the spring, loose cables, rollers outside the tracks, or a door that sits unevenly. Do not loosen hardware or handle spring-loaded components.
When to stop immediately
Stop using the opener if you heard a loud bang, the door feels unusually heavy, a cable is loose, a roller has left the track, a panel is folding, or the door hangs crooked. Repeated operation can add damage and may create an unstable condition.
Opener issue or door-system issue?
With the door closed, the opener may sound normal even though the lifting system has failed. A broken spring can make the door too heavy for the motor. Conversely, a balanced door can still remain closed because of a failed trolley, gear, belt, chain, control, sensor, or logic component.
What to tell a service professional
- What happened immediately before the failure
- Whether the opener makes a sound or moves the door
- Whether the door is level, crooked, open, or closed
- Any loud bang, impact, loose cable, or off-track roller
- The opener brand and approximate system age, when known