How to Troubleshoot & Replace Bosch AP5972147 / 00631200 Dishwasher Drain Pump

Surprisingly easy process. The video was easy to follow, and right on. After shipping the part was $60 and saved replacing a $700 washer. I'm generally handy around the house, but had never worked on an appliance before. 

E24 indicates a problem with the drainage system. Drainage pump was making a noise therefore I ordered a new pump and replaced it. I also cleaned the drainage outlet pipes and found a mass of fibers blocking the air gap between the dishwasher and the garbage disposal unit. This blockage was probably the cause of the entire problem, however I had no idea that the air gap neeeded to be checked. If anyone else is seeing the E24 error message then I suggest they look at the air gap first! 

The dishwasher is relatively new, so it was pretty depressing for it to throw the E24 code. I watched a few YouTube videos for troubleshooting tips (check hoses, check for blockages in the screens, impeller, etc) and nothing solved the problem. I removed the drain pump and found hair wrapped around the axle beneath the impeller. I live in a household where most problems come down to hair wrapped around something or clogging other things, so I ordered a new pump and it installed easily. Fixed the problem, saved a bunch of money. Wife and kids think I'm a hero. 

My Bosch (SHPM78W55N/10) had a bottom cover so the video did not help. I went in from the right side after turning off water and power. I moved the electrical box out of the way and pulled the pump out. I had to use a screwdriver to release the hose clamp. I pulled the pump out and checked for any debris. No debris so I replaced the pump. Put back together with a new hose clamp and replaced the electrical box. I didn't realize there was a new hose clamp in the box so I used one I had on hand. I thought there was no hose clamp because it listed it as a optional item. Put everything back together, ran a cycle and checked for leaks before putting dishwasher back in place. 

Replaced the drain pump 

Changed the drain pump, tried blowing the drain lines ( told to try just in case if they were clogged ) 

I watched the video on how to replace it. The video was very helpful. I had to replace the pump from the side instead from underneath. It was much more difficult because it was hard to get your hand in there. The process is easy. Getting the part out and back in were the difficult part. 

I ordered a new pump from APP using my Bosch model #. Watched a few videos and then installed the pump. I did lubricate the O-ring with some silicone grease. The hardest part is pump access. On my dishwasher you tip it up on it's back in order to remove the metal access panel. You do not remove the door on newer Bosch models. When I got the dishwasher re-installed I ran a short cycle and it worked perfectly. 

Replaced the drain pump. The old pump had nothing obviously wrong... there was no pool of water in the base, the pump spun freely, and had the correct resistance (125 - 135 ohms). Replacing it solved the problem. Found a YouTube video to demonstrate how to do the swap. Key was to take the door outer panel off to give more access underneath. Interestingly, once I popped the lower kick panel off, there was a folded sheet with wiring ifo, expected resistances, and even special key sequence instructions for testing various components. 

Replaced drain pump. Your video was great suggestion, but my model had drain pan that prevented easy access to pump. Relative easy to replace once I figured out how work in the small space.