Left hand side of induction hob not recognising pan. Kuppersbusch GKST60 14?

Hi
I have only just put this in my new kitchen, although I bought it over a year ago. I used it for the first time today and saw that the left hand side (both rings) seem not to recognise when a suitable pan is put on them. The heat setting just keeps flashing. The right hand side rings both work. Can anyone help me as to what the problem might be.