Question about Bosch SHU9955UC Built-in Dishwasher

2 Answers

Bosch D/W model # SHU9955UC. Drain motor is running, but is not draining. Removed drain cover plate and all seems clear. Any thoughts?

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  • scouch Aug 28, 2010

    Thanks for your very quicki reply, SilverDragon: Is there a quick and easy way to check for these blockages or do I have to pull the machine out to the garage and disassemble the whole thing?


  • scouch Aug 30, 2010

    Thanks to both SilverDragon and Macmarkus for your quick replies. Miracle of miracles: After visually checking the drain hose for kinks, I disconnected the dishwasher, hauled it out to the garage, "plugged" it in out there and lo and behold, the thing works fine.

    For future reference, I removed the left side panel and pulled off the drain hoses to check for blockages - found nothing.

    I then removed the drain cover plate, faked out the door switch, so I could observe the drain impeller function in acton, which appeared normal.

    I then dumped a gallon of water into the basin and ran the thing with the drain cover plate off just to see what would happen. I assumed it wouldn't drain, since I hadn't really done anything to it, but it proceeded to drain out onto my garage floor as I scrambled to get a bucket under it.

    Anyway, happy ending - just no explanation for it.

    Thanks again./Steve

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  • Bosch Master
  • 2,605 Answers

Hi, Welcome to FixYa. It sounds like you may have a restriction in the drain hose. The other possibility is the pump itself. With Bosch units the pump can actually appear ok but in fact not moving the impeller. If you observe it after getting out the water you'll observe the motor running yet the impeller just sitting idle moving slightly back & forth. Let me know if you are able to service this further on your own and I'll explain to you how. Regards, Macmarkus :)

Posted on Aug 29, 2010

  • Mark MacDonald
    Mark MacDonald Aug 30, 2010

    Hope it all goes well. Glad to be helpful where possible.
    Keep us posted how it works when re-installed, careful to insure drain hose is elevated/looped before the home plumbing.

    Good luck.

    Macmarkus :)

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  • Bosch Master
  • 12,061 Answers

Http://forum.appliancepartspros.com/attachments/dishwasher-repair/180d1207853064-bosch-dishwasher-troubleshoot-manual-bosch-dishwasher-troubleshoot.pdf
Hi please copy/paste the link above to get your troubleshooting manual, Now below is your exploded parts diagram, so you can see how it all goes and to be able to order parts.

http://www.appliancepartspros.com/partsearch/model.aspx?diagram_id=195132&&model_id=233039#d195132
Now it is most likely your Actual Pump that is blocked, or a Hose etc, check Both to see if there isn't something blocking the outlet or pump, and filters.
Also have a look at this post below, it explains things well.
http://forum.appliancepartspros.com/dishwasher-repair/8118-bosch-shu9955uc-12-drain-pump-running.html

Posted on Aug 28, 2010

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