The Star-K is recommending not to put both (upper and lower) Whirlpool Double Wall Ovens Models WOD51, WOD77,WOD97 and WODA7 on Sabbath Mode at the same time. To ensure proper functioning , select the Sabbath Mode feature for only the ONE oven you will be using on Yom Tov (or on Shabbos as permitted halachically).