Providing you've checked the filters, and that the condensor isn't blocked, it sounds like your thermal fuse on the heating element has blown.
Thermal fuses cost a couple of pounds from Maplin (crimp it in, don't solder for obvious reasons), or buy a new element for it, if the fuse keeps blowing . http://www.espares.co.uk/part/tumble-dryers/hoover/tc650-001/p/1088/107/0/385458/669097/tumble-dryer-2400-heating.html
SiG, February 2010
