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After powering up 'F' flashes on all four plates & '20'on the timer?

I have been using a BEKO Schott Ceran for a number of years. After powering up the hob one day, 'F' flashed for all four plates & '20' on the timer indication....nothing else works. How can I fix this?
WES, January 2014
Sorry I forgot to add that it is electronic....

WES, January 2014
link Click here to see other fixes for Schott Ceran.