This article contains the Troubleshooting Guide for the DZ401 / AD350CO Series Ninja® Foodi® XL 2-Basket Air Fryer. This supports the following product SKUs DZ400, AD350CO, DZ300, DZ300C, DZ350, DZ401, DZ401C, DZ401QBK, DZ401QCM, DZ401QGY, DZ401QNV and DZ401QWH.