Turn off the power and water to the machine before doing anything!
Then take off the top and back and check the plastic condensor assembly (left hand side looking into the back of the machine) and make sure its not blocked up, mine was blocked up solid. If it is take it off and clean it out, it comes apart quite easily, but make sure the drum is empty first. Then look at the the two thermostats on the dryer heater assembly at the top of the machine, small black round things with two tags on. One has a button between the tags and is manually resettable, it will probably have popped up because the condensor is blocked and caused an overheat. Press the button back in and you should have power back to the dryer when you next run the cycle. Reassemble in reverse order as required turn on power and water and you should be OK.
Col, November 2006