Use observations that are safe and clear to you: whether the normal control responds, whether sink water drains and whether a visible leak has appeared. You do not need to identify a particular motor noise to request help.
What the observation tells you
Do not place a hand on the appliance or near the opening to feel whether it is running. A household member may describe an event already observed, but an unsafe fault should not be repeated for demonstration. Explain any difficulty recognising the operating state.
A useful next step
Provide the model and visible symptoms in writing. Ask the engineer for return-to-use guidance that you can reliably follow rather than relying solely on a change of sound.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.