New dishwasher overflowing

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DIYer101

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Greetings, I just had a new dishwasher installed by the appliance store. It overflows on the drain cycle, and I'm trying to figure out the issue.

The code used to allow a standpipe under the sink. When the drain cycle runs, water now comes pouring out of the standpipe vent.

I tried to put a little camera down there, but it's not a nice camera (I'm no professional), and the only info I got is that I think (might be wrong) there's standing water in the standpipe.

However, there's also no high loop, which I don't think is related to overflowing (?) but needs to be fixed.

My thoughts so far:
1) Maybe the new dishwasher drains faster than the old one, and the drain can't keep up?
2) Maybe the installer dropped something into the drain?
3) I could try snaking the standpipe, but I've never snaked anything, and worry that I might push stuff farther into the lines (correct me if I'm wrong)?
4) I could run the drain line directly to the disposer, making a bet that the problem is the standpipe, and abandoning the standpipe.

Any ideas, please? I called the appliance store, closed on Saturday.
 

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Reach4

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1) Maybe the new dishwasher drains faster than the old one, and the drain can't keep up?
Most likely.
4) I could run the drain line directly to the disposer, making a bet that the problem is the standpipe, and abandoning the standpipe.
While that is not the Colorado way, that works. There is a plug in the disposal input you have to knock out do do that.
 

DIYer101

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Most likely.

While that is not the Colorado way, that works. There is a plug in the disposal input you have to knock out do do that.
Thank you! So, I guess the questions become:

1) Is there a way to make that drain keep up? Clean it out or something, or is the size just too small?
2) Are there significant drawbacks to running the drain directly into the disposal, please?

Thanks again, I truly appreciate it.
 

Reach4

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1. I think too small. I guess you could do something to slow the flow, but that is not going to sound attractive. I cannot be sure the pipe is not partially obstructed, but I suspect cleaning the pipe is not going to solve it. One thing I can tell you is that changing the venting will not help. This is a drain thing, and totally not a vent thing.

2. Works fine in other states. Physics are the same in CO. If you do that, the trap for the standpipe is going to dry out, and you would get a sewer smell in that case.

Would the buyer's house inspector ding you when you went to sell the house because it is not exactly following CO code? Dunno.
 

DIYer101

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Thanks again. I'm thinking of just going to the disposal, but I'm wondering if I'll have similar issues in the sink. The pipes seem to be even smaller coming out of the disposal, so I'm wondering if it might back up into the sink every time the dishwasher drains? I could be missing something here, of course.
 

Reach4

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Some backup into the sink during DW discharge is usually not a big deal.
 

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The other thing I'm pondering is cutting off that black piece of standpipe between the wall and the trap to see how what might be happening, and then replacing what I cut out. Happy to hear if that's dumb, though.
 

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Although maybe I'll just do all that, and find nothing. And it still won't matter because the pipe is too small.
 

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For anybody else who has this issue or is following along, here's the resolution: I switched drainage to the garbage disposal and added a high loop. When flowing into the disposal, the water comes in at a seemingly reasonable rate (not causing the "waterfall of chaos" that was coming out of the standpipe vent).

I was finding conflicting info on whether or not the high loop does anything to manage water flow. My takeaway was that it's really just to prevent backflow into the dishwasher, but I still/now have a suspicion that it could also help slow down flow(?). I was too scared to run more dish cycles into the standpipe after adding the high loop, and took the safer route of preferring to overflow the sink instead of the cabinet below. But now I'll have to deal with the standpipe (probably just cap everything and leave it, or I might someday switch drainage back to the standpipe and close the hole in the disposal).

Either way, all is well now, thanks again!
 
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