Don’t tend to get involved with cookers but couldn’t help myself.
The top oven thermostat only activates once you turn the knob to about 200 degrees then there is heat. The knob isn’t broken it all feels ok.
I’m assuming the thermostat needs replacing but need advice on how you access it. Does the hob lift up to allow access or do you have to drop the control panel forward somehow?
Not certain on that model no. Normally a couple screws at the back and you can lift slightly.
The control panel may have to come off to remove it completely