When the plug to the cooktop is plugged into the outlet under the cooktop, all of the igniters fire even though the knobs are not turned on. What do you think is the problem? An electrician was out and said the electric box is fine. What part(s) are faulty.
The issue that you would be having with the cooktop would most likely have to do with the burner switches. You will want to access the switches and check for any of them that have continuity in the off position. If any of them have continuity in the off position then they are bad and would need to be replaced. The burner switch is part number 3185830.