Describe what you actually know
Tell the technician which noise you heard, where you heard it, and whether any fan or heating started. Include the thermostat's normal display and any fault already visible without taking off a cover.
If you have a video recorded during the original event, it can show the pattern. It does not establish voltage, motor condition, or whether a preceding check was satisfied. Do not open the furnace or run it again to improve the recording.
Report recent repairs, power loss, or changes to controls. That history narrows the work to be checked without proving a cause.
Ask for the point where startup stops
We recommend asking the technician to confirm the heat request, identify the expected next step, and test why that step is not occurring. The diagnostic question is not merely “does the motor turn?”
If a motor repair is proposed, ask what supports it and whether the control and supply to that motor were evaluated. If a control repair is proposed, ask what finding distinguishes it from an upstream condition. The professional chooses safe tests for the model; you do not need internal testing instructions to understand the result.
Do not reach into the equipment, push a fan to start it, move wires, or defeat a door or other protective switch. A forced movement is not a safe diagnosis.
Choose the work after the finding
Request the full repair price and what it includes. If more than one fault is found, ask which work restores the intended operation and which concerns remain. A changed part should have a reason attached to it.
After repair, ask what complete heating operation was checked and whether any installation concern remains. A single startup sound is not the acceptance test.
While heat is unavailable, share the current indoor temperature and household needs. Confirm service timing, an update owner, and another warm place if the home cannot stay suitable. Do not rely on repeated attempts to force heat.
Your next action is to report the observed startup pattern and ask for a diagnostic visit. Let the measurements decide the part, rather than the video deciding it.