If there are no volts at the fan or element then it looks like it might be the thermostat which controls the electrics feeding them.Alternatively , if there is a timer , then this normally controls the main oven so this might be the culprit. If you have a multimeter or mains neon-test screwdriver you could fault it by testing for volts through the circuit...(.or check the element + fan for continuity ).. If you are not sure what you are doing then it`s best to call in an electrician.
Len
May 2008