Is your Ninja Double Oven (DCT451) door not closing or popping back open? This guide shows the correct FlexDoor operation, how to clear obstructions, seat the crumb tray, clean hinges and the door lip, and check level and clearance plus when to contact support.br br ✅ Microfiber Cloth I Use (Amazon paid link): br Disclosure: Some links above are affiliate links which means I may earn a small commission if you click and buy, at no extra cost to you.