Check to see if dishwasher drain is attached to garbage disposer. Running the disposer when the dishwasher drains and it will help keep it clean but if the disposer drain line plugs then the water can drain back into the dishwasher. If it does not connect there then you have a slow kitchen drain and this can be fixed by having a plumber snake it. Often it is plugged with grease that can be cleared with boiling hot water poured down the drain. If this is not the problem then check to see if the dishwasher drain is raised as high as it can go under the sink cabinet. Fasten it up with a strap if needed. This will create a trap to keep the water from flowing back into the dishwasher. Do this regardless of your problem. Lastly If the dishwasher does not drain and it is connected to the disposer then the problem is that the knock out plug was not removed when the disposer was installed. Remove the hose at the disposer and knock it out with a screwdriver. This plug is there so you can install disposer without tying a dishwasher in. Otherwise it would leak there. A slow drain may back up and run into the dishwasher before you see any water appear in the sink. If you raise the dishwasher line to the underside of the counter top you should see water in the sink before it begins to drain into the dishwasher. A slow drain may only show up when you are doing a lot of dishes.
SOURCE: Neff dishwasher water filling
there is a safety float in there to shut the water off most look like domes under the float is a safety switch take off the bottom kick and see if the float is on the switch if it is check to make sure the switch is good
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