James from Ireland, Nov2009 helped . . .
UNPLUG FIRST Remove large silver plate at back of dryer (save those screws!) and carefully remove. You might need to unscrew those smaller screws at 3 & 9 o'clock. Might see water so carefully clear all moisture from that electrical unit (hair drier handy, anyone?). Re-position element and refit to back.
But also THOROUGHLY clean and rinse that condenser unit located at the front (the one they tell us to clean every month!) Safety is of paramount importance.
Chocolate Labrador, February 2010