Appliance Repair Questions? Ask a Technician for Answers ASAP
I am afraid, this indicates an issue with the oven temperature sensor (thermostat) that is faulty and will need replacement.
When this is faulty oven suffers from uneven cooking or will not heat at all.
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Sure, please check this IMAGE (part#422 is the PTC sensor).
The part can be ordered by clicking here from Neff spares.
If you want to replace it yourself then unplug the appliance and pull it out.
Then remove the top and rear off the appliance, then you can replace the sensor.