Bosch Gas Hob – VIDEO of sparking problem

y video explains my problem but if it is easier, I also attach my script:->

http://uk.youtube.com/watch?v=ZoFQgyUkg8s

———————————————————-

Several months ago my Bosch Gas hob began sparking, spontaneously, maybe once an hour when all burners were turned off.

So I cleaned all the parts thoroughly and replaced:

· the FZ4 ignition device twice (with TFZ4s),
· two ignition leads (that is the leads from ignition device to burners) and
· the wiring loom that is the 4-burner-switch-wiring connected together.

Despite this, the problem remains and has got worse because the new ignition device sparks continuously when the burners are off.

If I now connect the mains power to the ignition device – you can see it sparks continuously inside itself and if I now connect some ignition leads – the nearest burner sparks continuously. The sparking only stops if now disconnect the earth wire.

This new continuous sparking did not occur with the old FZ4 ignition device but I broke that. Two dealers assure me that the TFZ4 is the only direct replacement available but I cannot see what else the fault could be.

Any suggestions on how to fix this would appreciated

http://uk.youtube.com/watch?v=ZoFQgyUkg8s