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Hello, and thank you for using this service. I'll be helping you with your problem today.Bosch dishwashers are not easy to work on for drain issues unfortunately.First, I'm going to assume you didn't change your garbage disposal recently--so if you did please speak up. You'll need to open the door and remove the center cylinder filter as well as the silver stainless mesh filter plate. This will allow you get gain access to the plastic sump (or pump cavity) below the filters. There is a little plastic dome held down by 1 screws on down inside the left side of the sump. Remove the screw (it's a size 15 torx bit screwdriver) and check for any blockages to the drain pump impeller that is now exposed. Put the cap back on and run another cycle to see if it works. If not, you'll need to uninstall the unit, disconnect the drain hose and blow through it to see if it's clear. If it's clear---replace the drain pump. Below is a link to a video that will show you how to take the sump apart to check the drain impeller.
CLICK HERE for video
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