Distinguish sound from visible movement
Did the motor hum briefly, run for several seconds, or make a new grinding sound? Did anything along the opener rail move, as far as you could already see from a safe position? Tell the contractor what you observed, and do not climb beneath the mechanism for a closer look.
The statement 'the opener has power' is useful but incomplete. It does not establish which internal component, connection, or door condition is responsible. Avoid ordering a motor or replacement unit before the system is assessed.
Mention recent changes in use
Tell the contractor if someone recently used the manual release, if there was a power outage, or if the door was struck. These details belong in the history even when you do not know whether they caused the fault. State whether the door is currently open or closed.
If a release was used, consult the exact manufacturer's instructions rather than a generic reconnection tutorial. Do not attempt reconnection on a visibly damaged, crooked, or unusually heavy door, and do not reach into moving drive parts.
Leave tension and drive components alone
Do not remove covers, tighten a chain or belt, or adjust springs as a trial fix. Never try to overcome a stationary door by increasing force. If there is a hanging cable, separated spring, or displaced door section, keep the controls unused and the area clear.
A door-system professional can explain whether the visit concerns an opener drive problem, a door mechanism problem, or both. Ask that the written scope separate those findings so you understand what each proposed charge addresses.
Sources: DASMA opener safety resources
Questions before replacing the opener
Ask whether repair parts are available for the identified model, what repair would include, and how a replacement option differs in equipment and installation scope. A new opener should not be presented as the answer to an unexplained mechanical door fault.
Confirm diagnostic charges and ask how the completed system will be demonstrated. Keep the model number and service paperwork so a repeat symptom can be discussed accurately rather than starting again with an uncertain equipment description.