Gas Ingnition?

I have a newish electrolux gas cooker .when I press the Ignite to get a spark button only two work. I cannot seem to get a good earth or spark fron two of the rings. They are both clean. Is it a bad earth or something? All the wiring seems ok and if I put my finger on the electrode there is some sort of elctrical pulse ,but no arc of a spark. Can someone advise me.
alan stockley, October 2005


done
there may be a crack on the ceramic on the ignition. if it has it will need to be replaced

josh, November 2005
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