The lights are flashing on my neff Scott ceran hob and it won't work?

I cannot turn my neff Scott ceran ceramic hob on. There is a - in each display for the four rings which flash every few seconds. I tried turning the mains swith off for 30 minutes then turning it back on again but the lights repeatedly flashed quickly about 10 times then gradually reduced the number of flashes until it was back to once every few seconds. Help!