Its construction, supply and service arrangements can differ. A general built-in-hob repair page does not establish that every portable appliance is accepted.
What the observation means
The model and intended use help determine the appropriate support route. A portable unit's owner instructions should not be applied to a fitted installation or vice versa.
A useful next step
Provide the actual appliance type before booking. Do not adapt a plug, extension or mounting arrangement to make it behave like another product. The service provider should confirm scope rather than implying universal coverage.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.