Appliance Repair Questions? Ask a Technician for Answers ASAP
Bertazzoni hobs are rather specialised, fault code 5 suggests a induction failure, this may be the power regulator or the induction ring itself.
With two being affected, most likely its a power regulator as that will be shared between the two rings.
Parts are also difficult to come by, can you provide me with your postcode and I can speak to the local engineers we have in your area to identify what options are available to you.
The power regulator is the power controller.