Have you checked that the air inlet on the left hand side of the machine is not obstructed? I have been to a few Hoover/Candy dryers showing symptoms of overheating, and on each occasion the machine had been installed tight against a full height end panel with minimal clearance (If any). I explained the problem to the customer and suggested the machine be moved across to the right of the opening and a strip of wood, inserted between the cupboard panel and the machine, to allow full air circulation to the air inlet grille. Always cured the problem. Poor design I fear and the problem easily overlooked. Graham