:mad:Really frustrated! I have a Thermador four burner gas range with two regular burners (right side) and two simmer burners (the X/O type - on / off) on the left side of the range. The two simmer burners will not ignite; I have replaced both solenoids and the blue gas re-igniter box - connected everything up - still no luck. Any help would be greatly appreciated. Do I need to now replace the simmer valves, do they even have anything to do with igniting the burner? Thank you in advance.:D