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Guide
A bang and a door that suddenly feels heavy is often a spring. Treat it as a call, not as a diagnosis you finish yourself.
In short. A bang and a door that suddenly feels heavy is often a spring. Treat it as a call, not as a diagnosis you finish yourself.
People describe a sound like a firecracker from the bay, then a door that will not lift. That pattern often matches a torsion spring letting go. It can also be a cable. You are not asked to prove which.
Do not shake the shaft to confirm the idea, and do not run the operator to test it. An operator that keeps trying to lift a dead weight can burn itself up. If you already smell heat from the motor, unplug the cord only if you can reach it without climbing or standing under a moving door, then call.
The visit identifies the failed part. The estimate names it before work starts. A bang is not a published price.
Leave it up or down, whichever way it stopped, and keep everyone out of the bay. Call (781) 602-0737.
Quiet failure can still be a spring or a cable. The visit sorts it.