What is the sound of one piston slapping?
What is the sound of one piston slapping?

Brief video to show problem. It comes up a foot, then back down, over and over until I the emergency release or press the button 50 times. Won’t go up. Can’t identify any specific binding point. Cannot be opened manually either... 🙁

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[Update]

Illustration for article titled My garage door is on the fritz... Please advise. [Update]
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Uhhh... Snappy boi.

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