Contact
Tell us what the door is doing and we will come back with the likely cause and a price.
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Describe the symptom rather than trying to name the part — the noise it made, whether the door moves at all, and whether the opener runs. That is usually enough to identify the fault before anyone travels. If you can see a make on the door or the opener housing, that helps too.
What happens next
We come back with the likely cause and the price for that job. If it turns out on site to be something else, you hear what it is and what it changes before any work continues.
If it is urgent
A door stuck open on an unsecured house, a car trapped inside, or a storefront that will not lock at closing time are the ones that cannot wait — say so and we will treat it that way. See emergency garage door repair for what to do while you wait.