An unexpected burning smell can signal a safety problem. Do not keep heating the load to see whether the smell disappears or assume it is normal lint.
Understanding this situation
Use safe controls or isolation where possible, keep clear of hot or damaged equipment and get out, stay out and call 999 from a safe place if smoke or fire is present. The load contents are relevant but do not prove the appliance is sound.
A useful next step
Leave the dryer unused pending appropriate advice. Report the programme, load and stage. Do not remove panels, reset protective devices repeatedly or run an empty hot cycle to burn off a presumed residue.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.