noticed this when I had to resort to using it last night - emergency last minute load of washing, pouring down with rain etc.
It turns on, makes all the right noises, hot air blows out of the tube (its not been put through the wall iyswim, jus stick the end of the tube thing out of the window!) it heats up ie: makes the clothes inside warm, but it doesnt 'tumble' them...any ideas why?!
Have taken all the fluff out of the filter btw.