I bought a second hand Bosch gas cooktop/stove and when I test its igniter - without having connected it to a gas supply, it only seem to spark for a single burner. If I move its igniter module wires around I can confirm that they all can spark. So I presumed this was an igniter module issue and replaced it with a brand new one, but it still does the same thing.
What do you think is the problem? Is it possible that this cooktop does this by default?