tumble dryer isn't letting any heat out?

Hi Lynne,
My hoover dryer did the same, I found the thermal fuse had blown inside of the heater pack.
If you look around the back of your machine unscrew the cover you should see the heater element pack, if you remove this, inside there will be a small fuse usually has a yellow band around it, it will read open circuit on a meter you can get replacement ones from maplins, all you need to know is the value in degrees c printed on it. hope this helps

Andy
December 2007