How to Troubleshoot & Replace Bosch AP4483459 / 00668102 Dishwasher Sump Assembly

To diagnose the problem I pulled out the dishwasher from the counter and ran it until E15 code appeared while looking underneath for source of leaking water. The water was leaking around the sump where it mates up to the bottom of the dishwasher. The youtube video provided an excellent tutorial on how to replace the sump, so I went ahead and ordered the replacement from AppliancePartsPros.com and followed the instructions in the video. The project was very doable with a little bit of time. The dishwasher is working fine now with no more leaking or error codes. Thanks for the quick delivery (2 days) of the replacement part and for excellent youtube video instructions! 

I ordered the twirly thing first and put in it still didn’t hold. So then I ordered the part that the twirly thing attached to I believe it was the sump I put that in definitely not as easy as the twirly thing but no problem note though have a phone or something to take pics of the wiring cause a few of them can go in the wrong slots!! 

I found a small amount of water leaking between the bottom of the metal basin and the sump. The gasket was failing. I bought the sump assembly, it came with a gasket. I had to take my time, it was involved. I watched the how to video first, then again when I did the repair. I put everything back together, tried the dishwasher, no leaks. I forgot to connect one electrical connector, and had to pull the dishwasher back out and connect wire harness. All is good now. It took me 3 hours. It would’ve been 2 1/2 if I hadn’t made the one mistake. I’m pleased. 

1) Large o-ring gasket between sump unit and underside of the tub, stopped leaking for a few weeks, then began dripping from another location. 2) Replaced sump housing, has fixed leak so far. AppliancePartsPros video was extremely helpful, followed it step by step. Not a simple job. Three hours+ from pulling the dishwasher out to fully reinstalled and ready to run. DIYers do need to keep in mind that professionally made technician repair videos, while very helpful, always portray best case scenarios and feature technicians that know what they are doing every step of the way, so it will invariably look easier than the real-deal DIY experience. 

Followed YouTube video as I went. 

Replaced the sump assembly, and while doing that, also replaced the circulation pump and heater. Generally speaking the unit was fairly easy to disassemble and work on.. I'd suggest taking a photo of the wiring connections before taking everything apart. After doing the work, I fired up the machine.. and no leaks.. great, but I got an e25 error. Solution was to understand and realize that the new sump pump housing did not come wth the drain pump cover. The drain pump cover is required for the drain pump to work. The drain pump cover needed to be transferred from the old sump housing to the new sump housing... that was not initially evident. Now all is well, dishwasher is running like a champ. 

Replaced both parts successfully 

I replaced the entire diverter valve (using the great online video). There was also a lot of buildup on the sump, so while the dishwasher was dissembled I replaced the sump. Both replacements were pretty straight forward. 

Replaced the sump, easy repair following the Appliance Parts Pros Youtube video, hose clamp for the pump was actually included with the sump. I wish I ordered the diverter valve gasket as well though. 

Removed and replaced the sump & pump assemblies.