I'm after some advice. We've just had a new Neff induction hob fitted. Only one side is working. 3 areas have an error code 5 13 on it. I've spoken to Neff and they say the error codes relate to an installation error and won't help but the electrician is adamant it's a faulty hob. They've used the hard wired cable already in the house but we're stuck with what to do. Can anyone advise please?