Hi
I have a seimens hb131550b/01 oven when using the grill selection both parts of the grill element are on full even if i turn it down, there are three settings and wondered if there is there a problem with it
If the grill has three settings but all three settings produce the same output from the element it would suggest a fault yes.
Looking at the diagram, it’s a pretty complex appliance this one and I would recommend an engineer if there definitely is a fault (refer to handbook ?)
Check the repairs@ link at the bottom of my post if you need an engineer 🙂