most likely cause is the oven element, take off the panel in front of the fan and inspect the element, it will probably have a hole blown in it , turn off power beforehand
keymatic irl.
February 2013
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix electric cookers.