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Hello and welcome to just answer my name is ***** ***** I will be the one to try and assist you. It sounds like your gas valve is not opening up? Now you said the small oven is working? So can you use it to cook? Do you smell gas on the small one? Is there more than one gas valve?
Then that does sound like a control board issue. I can not see two gas valves being bad at the same time and there is no way to check the board just replace it. You will want to call viking to get a replacement board that way you do not end up with the wrong one.
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