Thanks 'Cat'
Will let you know how I do - Chris.
Later - Took it apart finding the 4 IGBTs OK, caps reading correct values and no sign of any dries. Looked about on line, and found this by a White goods serviceman after reading his 'Neff' service manual - Not exactly helpful but.
Error code (F0) - There is no connection between the TC and the ELIN/relay board and the ELIN.
Try –
Disconnect cook top from power
Check the TCELIN/relay board ELIN connection, if the failure continues, change the ELIN PCB.
LIN protocol (local interconnect network)
Basically, you need to unplug or isolate the unit from the electricity supply.
Open the hob up and check the cables connecting the boards together. (Unplug them and plug them in again) Check for burnt connectors or PCB, if OK reassemble and try again. If still faulty you need change the main pcb.
Guess not component level repair advice.
In the event found a burned O/C 15R(S) in the low voltage supply on the ELIN board - Sorted.