this info is about proline TDC7A
sounds like mine ,, i changed the thermostat ,, which can b found at the back off the dryer undo the screws theres bout 8 hold the metal plate on ,,, then there r another 2 screws one at each end off the plate ,, undo them and the thremostats r just there, they r little round things with red wire going to 1 and blue wire going to the other ,, if one off them look like the button in the middle have been pushed in, then thats yer problem ,, i fixed mine today 11th may 07 n i never had a clue where they were , they cost me £17.95 which is cheaper than a big call out fee n all that rubbish ,, good luck n i hope this helps ,,,,c ya
thomas, May 2007