Top 5 most common Ninja Double Oven (DCT451) problems and how to fix them fast. Power issues, preheat stuck, noisy fan, uneven cooking, and smoke here’s what to do, plus when to call support.br br ✅ Roast Tray I Use (Amazon – paid link): br 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.