Re: belling slot-in dual fuel cooker
isolate the supply circuit at the wall or consumer unit FIRST
remove oven shelves
remove back cover ploate at rear of oven chamber this covers fan
inspect heating element…if its blown you can may see evidance of element being split of welding like marks
if not visable remove element and meter element to check for continuity
if no continunity then element is blown ( open circuit)
it is advisable to get circuit to element checked out as some element failures take out control thermostat also..in which case you will need a thermostat
in real terms an expert is the best route to take ie -an qualified engineer
diy is ok but BE SAFE and sure so get in an expert