This article contains the AF400UK Series Ninja® Foodi® MAX Dual Zone Air Fryer Troubleshooting Guide. This supports the following SKUs: AF400UK, AF400UKCP, AF400UKDB, AF400UKWH and AF400UKDBCP. Please note this also supports the refurbished models AF400UKCPREF, AF400UKCPREFB, AF400UKDBCPREF, AF400UKDBCPREFB and AF400UKDBREFB.