Is the machine being used in a cold room?
Hoover heat pump dryers are designed to be used in a room with a temperature above 7 degrees C. During the winter a garage or some rooms in the home may be below this critical temperature and the product will not be able to get warm inside the drum. Move the machine to a 'habitable' environment or heat the room it has been installed and used in.
Always disconnect your appliance from the mains before you start examining it!
