Siemens Ovens - Recent Questions, Troubleshooting & Support
Siemens HB48E20/01 Function knob
Based on your description, it sounds like the problem may be with the function knob itself. It's possible that the knob is not making a proper connection with the oven's control system when turned to certain functions, which could explain why the oven doesn't heat up and the light doesn't turn on. Additionally, the fact that the oven sometimes stops heating and the light turns off on its own, and then starts again when you wiggle the knob, further supports this hypothesis.
Replacing the function knob is a relatively easy and inexpensive first step to take in attempting to fix the problem. However, it's also possible that there may be a more complicated issue with the oven's control system or wiring, so if replacing the knob doesn't solve the problem, you may need to consult with a qualified technician to diagnose and fix the issue.
Siemens oven not heating to high temperatures
possibly,but i would check both upper and lower elements are working first, lower element is hidden so test from the back with a multieter after removing oven fuse from the power box
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