Author Topic: Samsung DMR78 (DMR77) Dishwasher Repair Manual  (Read 27471 times)

Offline Kixtosh

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Samsung DMR78 (DMR77) Dishwasher Repair Manual
« on: May 01, 2012, 05:48:18 PM »
I have one of the infamous Samsung DMR78AHS dishwashers.  Can anyone tell me where to find the manual for this machine? I think the DMR77 and DMR78 models are almost identical, and that the last three letters in the model designation don't mean much (color differences, etc.).

I found a reference to it in this thread:

http://appliancejunk.com/forums/index.php?topic=8007.msg37796#msg37796

But I did not find it listed here:

http://appliancejunk.com/forums/index.php?topic=9457.0


So why do I want the manual? Well, since I'm already here, and I'd like to share my experience if I'm able to fix this, the dishwasher basically stopped working properly after about 14 months:

  • Dishes were coming out with more and more of a thin film of deposits on them. I removed the whole bottom filter assembly (under the bottom propellor), and found the entire area filled with brown greasy gunk of some description. I cleaned that all out, and everything worked better for about two months, but now it's doing the same thing all over again.
  • I also discovered that some plastic tabs had broken off the top height adjusters. This is apparently a common problem, and the design has been strengthened twice already, so I'm hoping the new ones will not break if I can get the darned thing working properly first. I never found these, so I'm wondering if they are still lost inside somewhere, and causing the first problem above to happen.
  • Finally, I now get a 9E error. Apparently this can be caused by the sensor (I think), on the outside left area of the main tub. I'm trying to remove that to clean it out, but I can't get the thing come off.

Any help finding a link to the manual, or advice about the repair, would be very welcome! My wife is about to throw the whole thing out with the trash.

Offline AJ

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #1 on: May 01, 2012, 06:05:40 PM »
Quote
Can anyone tell me where to find the manual for this machine?


http://appliancejunk.com/forums/index.php?action=store;sa=view;id=149
Hope you find our website helpful.

Offline Kixtosh

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #2 on: May 01, 2012, 06:07:36 PM »
Got it, thanks!

Offline AJ

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #3 on: May 01, 2012, 06:18:34 PM »
Your welcome,


I have not had a chance to look over the service manual and I don't have any experience with Samsung dishwasher, but maybe another tech will have some words of advice for us.


Let us know what you find or if you have any other questions.


 O0
Hope you find our website helpful.

Offline JWWebster

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #4 on: May 01, 2012, 09:32:29 PM »
Show some pix
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Offline Kixtosh

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #5 on: May 01, 2012, 10:23:16 PM »
Thanks for the comments, guys! I was working on the machine all this time.

The service manual was quite helpful. Basically, I removed all the pumps from underneath the machine. There's an access panel. I checked for stuck pieces of anything broken, and found none. These are:

1) The drain pump.
2) The circulation motor (drives an impeller in the sump, and the waste "disposer" blades).
3) The distributor motor (drives a "valve" mechanism, I think, inside the sump area).

I also checked that sensor case, when I got it removed. There weren't any tricks in the service manual for this, it's just very fiddly to remove. It had enough gunk in it that this might have been the cause of the 9E errors (low level, I think). It's clean now.

I'm coming to the conclusion that either something isn't working at all (perhaps that distributor valve), or the seals are not doing their job. The whole inside of the sump area, underneath the filter was disgusting, with caked on brown gunk. The walls and every part of the machine is covered in whitish deposit of some sort. Maybe it's soap scum, but it's very dirty looking compared to the inside of a family member's much older Bosch (also with a stainless interior).

I'll didn't take any pics, unfortunately, but the seals I am worried about are described by Sears partsdirect.com here:

http://www.searspartsdirect.com/partsdirect/part-model/Samsung-Parts/Dishwasher-Parts/Model-DMR78AHSXAA0000/1482/0130000/50039656/00004
http://www.searspartsdirect.com/partsdirect/part-model/Samsung-Parts/Dishwasher-Parts/Model-DMR78AHSXAA0000/1482/0130000/50039656/00005

The enlarged images from those links are attached. In the first diagram (what Sears calls the base) you'll find part 3, the case assembly; and part 2-5, the sensor case. I had trouble separating the two, and trouble getting the two pipe fitments off from the rear of each.

The seals are listed in the second diagram (that Sears calls the pump assembly):

- Part 6 from the pump assembly: filter seal.
- Part 11 from the pump assembly:

From the same diagram:

- Part 10 is the impeller, driven by the circulation pump (or "pump").
- Part 8 is the valve, driven by the distributor motor (or "synchronous motor").
- Part 24 is the drain pump.

Those seals are next to impossible to get back in their "track" for assembly, so I'm guessing I stretched them during cleaning or something.

Offline JGM

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #6 on: May 11, 2012, 08:51:31 AM »
I had the misfortune of buying this model and, in addition to the wash quality problems have (the apparently also infamous) grinding noise.  I've heard this is due to plastic parts breaking off and getting into the pump, but I'm not sure the process to get to it to check for same. 

Do I have to disassemble everything shown in the second PDF to get to the pump itself?

Thanks

Offline wildimaginations

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #7 on: May 11, 2012, 07:45:01 PM »
Make sure your water temperature is 120F or higher.  The symptoms you're describing is possibly from the hot water not hot enough or you are not making sure that there is hot water at the kitchen faucet before running the machine.
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Offline jsnwalkr

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #8 on: May 16, 2012, 10:31:04 PM »
I can't claim the distinction of selecting the Samsung DMR78AHS model but do have the joy of owning it! It was installed in the house we bought last year and has not functioned well the whole time.

The unit make a noise that may be the grinding noise others have mentioned. Now it will not complete a cycle. It stops part of the way through with a 9E or HE error. The inside of the dishwasher is warm so I don't think it is the heating element.

Any suggestions I would be greatly appreciative!

Thanks!

Offline scrapiron

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Re: Samsung DMR78 (DMR77) Dishwasher Repair Manual
« Reply #9 on: May 17, 2012, 08:14:12 AM »
I believe a 9E code is low water level error. It could be triggered by low water level, a problem with the float assembly, ( the part on the left side you were referring to) or a clogged hose between the float assy & the wash pump.

 

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