Check if the timer is set? If that is okay, a failed element is the most likely cause. Disconnect the leads and check continuity with a test meter.
Belling Oven is Not
You can test whether your Belling oven
up correctly by turning the oven
on, setting the temperature
and letting it sit for five minutes. If the oven
cavity is not hot when you open the door, it is likely that your oven
element is broken.
Belling Oven Not Working? Here's How To Fix it