Hey everyone, I ran into a Kenmore electric glass top range model no: 790.99012100 & serial no: VF13813889 (made by Frigidaire) where both front burners would not heat. I had to replace the surface unit control board part no: 316239404KITK. Both burners work now but we have a small problem with the left front burner. This burner is a dual size burner and with the control at the off position (12:00), if you turn it to the left (11:00) it should heat on high with the 6" burner only. This is when I get the F7 code. If I turn it from off (12:00) to (1:00) high 6" & 8" it heats OK. Also if I turn it from off (12:00) all the way around clockwise to the 6" high position (11:00) it works OK. The 6" lower heat settings also work OK. Only when I go from off to 6" high is the F7 code. Has anyone ran into this problem before and do you know what the code means? I had to download the schematic from the sears website because the owner could not find the tech papers that were on the back of the range.