Well, its almosr certain that the problem here, is that the circular element behind the rear panel of the oven, has failed.
If you had a meter, you could test it. However, you can look at it and you may well see some physical damage.
Please go here
, just click on the word in blue.
The good news is, the element is fairly cheap, you can order it from the link I sent you, and there is a video there showing you how to do the job.
If you need more help, please just ask.
In the meantime,
Can I ask you to take a moment and rate my response? Please use the smiley faces which you should now see. Please remember you are rating me personally, not the website or the problems you have had with this machine.
If you need to ask me anything after rating, please just follow the link in the welcome email