You need to check if the elctricity is getting too the heater. The heater connections can been seen on the righthand side looking at the back of the machine. A mains tester is required or you could use a lamp holder and flex with a bulb. (But be carefull electricity can kill)
If power is at the two connections the heater has blown and replaced it is the only way forward.
pfixit
January 2010