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Two things can cause this problem:
1. The check valve in your dishwasher may be defective, allowing water and food debris to seep (or run) back into your dishwasher.
2. Your drain hose may not be "mounted up" the way it should be. Look under your sink. Look at how your drain hose is connected to your garbage disposal. If the hose runs down to the floor of your cabinet and into your dishwasher, that is wrong. Instead, it should be mounted up so that water from the sink and garbage disposal would have to flow up first to get into the dishwasher. If you do this, then even if you have a bad check-valve in the dishwasher, it will prevent the problem (or greatly reduce the problem) of dirty water flowing back into your dishwasher.
there should be screws inside the door at the top and sometimes even on the sides depending on the quality of the person who installed it. after removing all the screws turn off electrical breaker in power box. unplug cord if visible under sink. also unhook drain hose and the pull washer out while feeding cord and hose through wall of cabinet.
The drain hose is supposed to go from the garbage disposal to a high point under the sink in back to keep the water from gravity draining into the dishwasher when it shuts off. If you look you will see that the hose is laying on the bottom of the sink cabinet. Get a hook and wire it up so you're not washing dishes with water from the disposer. Be sure to run the disposer. if it is clogged with food the dishwasher will not drain, water will back up and drain back into the dishwasher. Also make sure that the pipe exiting the disposer isn't clogged and draining slowly. hhe best solution is to have an air gap that mounts on the sink. It goes between the washer and the disposer to keep this from happening.
In my case the counter mounted breather for the drain tube was being restricted ... finally to the point it would not drain the tub at all. I disassembled the above counter drain assembly and cleaned it out as it wass completely blocked and things work very well again. I would suggest this foirst as it is an easy task and is done 'above the counter'.
I then ran 2 cups of CLR with wash cycle ... no dishes to clean out the rest of the washer as on dissaembly of the internals to diagnose they were and very scummed up with a hard white crusty substance that was completely blocking some of the drain sump performations.
Try clearing the air gap (which is the seemingly pointless thing that is near your kitchen faucet.) 1.Take off the shiny metal cover, and you can sometimes twist off the plastic cap, or you may need to use needle nose pliers to push in the tabs that hold it in. You may or may not see debris in the tube that is in the air-gap. 2. Now what you need to do is take a clear glass and put it over the air-gap with part of the glass hanging over the edge of the sink, you may want to put a towel around the other side of the glass to keep the water from going all over the counter, turn the dishwasher off then on again and select "rinse and hold". If there is any thing in the line it will come out. 3.If not you may need to take out the filter in the bottom of the dishwasher and on the left hand side in the sump area there is a small, (usually yellow) cap that covers the drain motor impeller that can usually be pulled towards the center/right by hand, if not with needle nose pliers. You will need to vacuum out the water with a wet/dry vacuum or towels. If none of this works, let me know and I will go over some more uncommon draining problems.
Check the level of your drain hose underneath the sink between the dish washer cabinet and sink cabinet connect to the dispose position, sometimes if the middle part lower than the dispose will cause the back up problem, should be a little higher.