Most likely a blown heater element in the drier unit. Also 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. Washer Dryers work by having cold water trickle down the inside of the drum whilst hot air is being blown into it.The hot moist air from the washing converts back into liquid when it hits the cold water, and it is pumped out along with any fluff that may be with it. Unfortunately the internal ducts and channels get congested because of this fluff and prevent the cycle being completed. The condenser needs to be removed and cleaned out thoroughly and so does the sump and outlet hose.
Repair and service your own washing machine. Go to www.2ndwave.co.uk/manual.html
dannyboy
October 2008