white knight dryer?

hi i have a white knight 427wv dryer which has stopped drying clothes, iv had a look at a few sites which says to press the reset button at the back of the machine. i have looked everywhere on this machine for the button but cant find 1. the dryer seems to work apart from heating up to dry the clothes. in desperate need to know if there is another way before i buy a new dryer. HELP!!!!!! thanks