I've had the same problem.
Pete found the good answer, the problem comes fom the temperature sensor, it's very easy to change at the base of the drum. You can find it at http://eshop.euras.com/detailsseite.asp?pic=8037517
part number is 8037517. (the part number of the Hoover vision 1600 AAA is 31138159, in case you don't find it cause it's pretty hard to get)
christophe
August 2008