Follow this just done mine and working perfectly after about 10 months..........saved me a few £ on my electric bill though ha!
unplug the drier
2. UNscrew the back panels first bit that sticks out (2 screws) then the larger panel (about 8 screws.
3. ONce open you will see the heating coils and above that 2 small circular elements - these are the thermostats.
4. one of the thermostats will have a small hole in the back.
5. find something small like a pin and push into the small hole untill u hear a click.
6. screw alll the panels back on and plug it back in
7. Hey presto the tumble drier works and you have saved yourself a £90 call out + labour charge :)
Emma, May 2009