Imfornu, under each burner control is a valve and a switch that controls the spark to each burner. Sometimes these switches become wet or short out. In this case it sounds like yours is shorted in the closed position and therefore the spark. These switches run on a harness across each burner control valve..I believe the part number is PG220020, you can look it up on the net to get an idea of what it looks like...Catriver..post back.
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