can you advise what you mean by a 'SENSE' light, what does it look like and where is it located on the display?
The fault your describing suggests the heating element has failed, but want to double check what light is showing, to rule out any other potential fault.
The sense light should be related to the oven probe.
It sounds like there is a fault with the fan, this may be the fan itself or the control board, since its the role of the fan to maintain a consistent temp in the oven, and if its not circulating the heat doesnt move around the oven where the thermostat is hence you getting extreme.
Unfortunately this sounds very much like a hardware fault, and would now require the unit to be stripped down and the electrical connections tested, to determine if the control board has failed, or if there is a fault with the fan itself.
If you provide you post code I can suggest a suitable engineer to come out and resolve this issue for you.
I havent heard back from you in the last day or so, and just wanted to check if you still require assistance?
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So I may close the case, appreciate if you can rate the service received.