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Why does my garage door opener hum but not open?
Short answer
Often a broken spring, a locked door, or a stuck track. Stop pressing the button and check from a safe distance.
See every step in 1 minuteThe garage door won’t open after a loud bang: broken spring
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Official sources
- CPSC: garage door safetycpsc.gov
- FTC consumer advice: hiring contractorsconsumer.ftc.gov