Separate the heating-zone symptom from the ventilation symptom and identify the combined model. Shared housing does not make their functions identical.
What the observation means
This service excludes extractor-hood work, so acceptance must be clarified rather than assumed from a hob repair page. Some access tasks may involve both systems.
A useful next step
Describe which local controls and functions still work. Follow the manufacturer's owner-care instructions only for designated filters or collection parts. Do not open the underside or modify ductwork to investigate a ventilation problem during an ordinary hob enquiry.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.