Do not use improvised external heating as a repair or performance treatment. The appliance needs the environment specified by its manufacturer, not concentrated heat directed at controls or panels.
Understanding this situation
A changed drying result can have several causes, and warming the cabinet does not diagnose them. A portable heater can also add electrical load and create its own clearance or fire concerns.
A useful next step
Use suitable room conditions according to both products' instructions. Report persistent poor performance with the location and programme details. Do not remove panels, cover vents or heat a suspected frozen machine to force it back into use.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.