Not sure this will help but recently had an engineer look at our hotpoint machine with the same problem. He replaced the fan assembly. He mentioned you can sometimes get away with cleaning it out.
wc_boggs
December 2007
I can answer this question...
Hotpoint TL21 Tumble Dryer - drum rotates but no heat?
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tumble dryers.