Hello. my friend connected a new induction hob to me today. has four boxes, but the ones on the right don't see the pots. The 2 boxes on the left work ok. I wonder if this could be the fault of a wrong connection. Is it possible to connect the hob so that one field heats up and others not? I am a total layman. I will be grateful for suggestions. call an electrician or contact the service immediately?