Ninja Foodi Max 15-in-1 SmartLid Multi-Cooker 7.5L OL750UK - Not fully working

This item is faulty and is being sold for parts or to be repaired. The model is a Ninja Foodi Max 15-in-1 SmartLid Multi-Cooker 7.5L OL750UK. It's in used condition with usual wear and tear. There is no cooking pot, 2 tier rack or cook and crisp basket included. These will need to be bought separately, and no functions will work without the cooking pot being inserted first. The multi-cooker does power on, and other cooking modes work apart from the slow cooker function. The slow cooker function tries to pre-heat but doesn't succeed and displays a "no pressure" error.