This article contains the OL550UK/OL650UK/OL750UK Series Ninja® Foodi® SmartLid™ Multi-Cooker Troubleshooting Guide. This supports the following SKUs: OL550UK, OL650UK, OL650UKCP, OL650UKDBCP, OL750UK and OL750UKDBCP. Please note this also supports the refurbished models OL650UKCPREF, OL650UKCPREFB, OL650UKDBCPREF, OL650UKDBCPREFB and OL750UKREFB.