If you have a spark module that automatically sparks regardless of the position of the switch until the flame is detected and then stops sparking (like the RI-302, RI-324 or RI-326), but your spark module keeps sparking after the flame is lit, this could be a ground issue. The switch controls the amount of gas (how high or low the flame is) and sends a signal to the spark module that a specific burner is turned on. From an electrical standpoint, the switch is either on or off (there is no position on the switch that says “lite”). Once the switch is on, regardless of the switch position, the spark module controls the spark. The spark module will spark until a flame is sensed at the burner that is turned on. The switches are individually wired to the spark module so the spark module knows which burner to sense. Once the flame is sensed, the spark module will stop sparking. If you turn on the switch, gas is released and if the igniter starts to spark, you know the switch is good. The spark module then sparks all burners (safety feature) and continues sparking until a flame is sensed at the specific burner that was turned on. The flame is sensed using flame rectification (a process where the spark module senses the resistance of the wire in the igniter that sits in the flame, and the resistance of the wire changes when the wire is hot from the flame). The burner needs to be grounded to the chassis (the chassis is grounded to earth through the green wire) for the spark module to properly sense the flame and stop sparking after the flame is lit. If your burners screw into the cooktop, the burner is grounded through the screw which connects to the chassis of the cooktop. If the screw rusted (the screw may look fine from the top but could be rusted or corroded down below the burner where it attaches to the chassis), the ground connection can be interrupted. So if you turn on the switch and the igniter starts parking, the switch is good, and if the spark module lights the flame, the spark module is probably good. But if the spark module keeps sending sparks even after the flame is lit, you probably have a faulty ground. You need to remove or drill out the old screws holding down the burner (the screws frequently break when removing and have to be drilled out, you might need a slightly larger screw after drilling), sand out the screw hole, and put in new screws to re-establish the ground. If your module sparks with the switch in the off position, you have a different issue (probably water got into the switch and is completing the circuit so the spark module thinks the switch is on). In that case, you need to wait for the switch to dry (or gently use a hair dryer).