An empty drum does not reproduce the moisture and contact conditions of a suitable laundry load. Its behaviour may therefore be unlike the ordinary programme result being discussed.
Understanding this situation
A quick end in that state is not proof of a broken sensor, and heat felt on the cabinet is not a complete performance measurement. Testing should follow the exact manufacturer procedure where one exists.
A useful next step
Use observations from normal permitted loads in the enquiry. Do not run repeated empty hot cycles on a machine with a fault. Let the engineer choose appropriate tests rather than interpreting an improvised demonstration as a diagnosis.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.