heater element is shot or a connection (wiring)to the element is disconnected remove from mains electricity (turn off power source.. safety first you know !!!!)remove screws at back of tumble and see if any loose connections. if all seems ok look for a thermal cut out reset button at back of machine usually coloured red press that and try again . if no joy there and you have access to a test meter then set meter to ohms or contiuity and check across the elements terminals ( DO THIS WITH POWER DISCONNECTED)!!!!!!!!!!! there should be a very low ohmic reading something like 0.005 ohms or if using a continuity meter there shoud be a ringing sound comming from the meter if so your elements ok if not then as i said earlier your elements shot. replace it like for like and that should get you up and running. word of warning if your not sure or think its beyond you PLEASE CONSULT A QUALIFIED ELECTRICIAN LIKE MYSELF
good luck !!!!!
andy gibbons qualified 16th edition electricain, March 2008