I have a similar problem with my Hoover TC650 tumble dryer as several before me (no heat, everything else works, clean filter light on). The call out charge alone is ridiculous (£80). If the advice from E Lambert is correct, then one "only" needs to replace the element. Getting to the element is fairly simple, unplug dryer, take off metal cover at back of dryer and the element is revealed. To see a picture and to order a spare part look at http://www.sparesrus.biz/ol-catlg/td-element-05.php. I will now order one and see whether it works. I will report back in a weeks time.
Markus, July 2004