When I turn my schott cewan hob on all the lights come on when I touch each sensor, I have power, numbers on each one goes from. 1 to 9 . On every ring, it is not locked. The problem is none of the 4 rings heat up , I've had it a year and no problems . I think it must be a sequence problem but I can't work it out ! Can anyone help please .

bob

Bob, January 2017

Schott Ceran is the maker of the glass.

http://www.schott.com/hometech/english/products/ceran/download/index.html

You need to find the make and model of your hob and download a manual

XXX, January 2017