Power failure on my ceramic hob, can it be fixed?

My Bosch Ceramic Hob would not power up this morning. When trying to power up, only a single red "dot" appeared next to the "on" button for about a second. I tried switching off/ on at the isolator - no effect.
Decided it must be a "software error" not mentioned in the Bosch Manual.
With the mains isolator on: I pressed the "on" button with various combinations of the other three buttons. All the rings switched on at power level 8. I switched the isolator off, and then on again - and the fault had cleared. I then tested each ring - power on/ power level up and down/ off.
It was back to normal!!

David Aitken
April 2008