Most likely a blown heater element in the drier unit. Power off, drag machine out onto the floor, remove back cover and top cover. Check the fan in the drier unit - if its not rotating, the element will have overheated and possibly triggered a thermal cutout device which cuts off the power to the heater element. Some thermal cutouts can be reset, most need replacing. Only way to test is to disconnect the wiring and take resistance readings across the element and any thermal cutout device with a multimeter. Check all wires and connectors generally for internal breakages - caused by movement of the wiring loom attached to the drum. Check for wear of the wiring insulation allowing the bare wire to short out on the machine frame.
Repair and service your own washing machine. Go to www.2ndwave.co.uk/manual.html
dannyboy, February 2009