BEKO DV555 Bottom oven not working.

Hi, I have an electric oven which is roughly 3 years old and for the second time the main bottom oven has stopped working.

The first time it stopped the bottom oven and the display stopped working and I had someone come out as it was still under warrenty and he said something about a cut off switch needed to be bypassed as all beko ovens needed to be sold with this cut off switch enabled. I have no idea why.

this time the display is still working, but the bottom oven has stopped, it lights up inside and the fan moves. The thing I have noticed is the orange light next to the main oven knob does not come on anymore, the orange light normally comes on to indicate that the oven is heating up, but it doesn't come on nor does the oven heat up.

Any idea's would be appreciated. I am a good handy man that can take things apart and replace faulty parts even minute soldering, though I have no idea where to point my finger at this oven to fix it. If anyone coulld point me in the right direction I know I will be able to repair the oven, it's just what needs repairing I need to know :)

Thanks for reading and I hope someone can help me out.