Hiya,
It's more likely to be the element.
On this machine it's a fairly easy job to do.
You'll need the model number of your appliance to obtain a new circular element.
However, we have to confirm that this is the fault first.
Isolate the machine from the electricity supply, turn it off at the switch and at the fuse box if possible.
Inside the oven you'll see a back plate held on by 4 screws, take these screws out and take out the back plate. You may have to remove the light cover (if there is one) to take the panel out.
Once this is out you'll see the element. Look closely for splits or blown parts of the element. If you can see these, just get your replacement before continuing.
If not, remove the screw(s) securing the element in place. Carefully work the element and it's wiring into the oven cavity. Make sure you don't lose any wires, if they spring back into the holes you'll need to take the back off the cooker to retreive them.
As the wires come through, make a note of the colours and which one goes where (write it down, make a diagram, don't lose it).
Disconnect the wires, bend them so they don't go back through the holes and take the element out.
If you have a multimeter, test the element for continuity. If it's open circuit you need a new one.
If you don't, ask someone who does to test it for you or take it to your local repair shop and ask them to test it before buying your new one.
Fitting is the opposite of removal.
I had the same problem with our built in synergie oven and someone is coming to repair it for us because neither myself of my partner know anything about the cooker or electricity for that matter. The answer above I got from an appliance technician through another website that I had to pay for. It was well worth it as you can see.
Hope this helps
Lee-Anne, January 2009