@asaxena the “open stopcock” means that your DW does not get any water. Make sure that you have no kinked lines, that all faucets that have to be opened (depending on your plumbing) are open and that your Miele does not have a clogged water inlet filter. If all of that is okay, you may have issues with the water inlet valve. When it displays Waterproof then the waterproof system sensor detected that water has leaked into the base of the dishwasher and has activated the flood switch. Time to check the drain pump and the drain hoses. Again, make sure there is no debris in the pump housing and that there is no kink or other obstruction in the drain hose.