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beefcakefx  
#1 Posted : Friday, November 15, 2013 3:55:02 AM(UTC)
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beefcakefx

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What's causing the noise? I just replaced the pump & motor assembly (pn 3485ED1002B) but the noise persists. Please, help!

Hear the noise:
LG Dishwasher Noise (Model #: LDS5811BB) - YouTube
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Appliance Ninja  
#2 Posted : Friday, November 15, 2013 7:20:38 AM(UTC)
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Appliance Ninja

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I listened to your video, that was very helpful. If you add a gallon of water to the tub manually, does the noise go away? It sounds like there is not enough water for the recirculation process.
beefcakefx  
#3 Posted : Friday, November 15, 2013 4:27:55 PM(UTC)
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beefcakefx

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Yup! I experimented with this a bit. When I stop the dishwasher (power off) to add water, then turn on again, the extra water is drained off before any cycles begin (noise resumes). When I pause a cycle by opening the door and add water, the noise goes away. Once the cycle is over, it drains of the water I added before starting up again, and the noise returns.

Thoughts?
Appliance Ninja  
#4 Posted : Friday, November 15, 2013 4:32:56 PM(UTC)
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Appliance Ninja

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Okay, so if you allow it to just go through the fill cycle and start washing, how is the water level? Does it seem low? I suspect you have an issue with the water inlet valve. There is a screen in it that may be plugged, not allowing ample water to get through to the tub.
beefcakefx  
#5 Posted : Friday, November 15, 2013 4:54:59 PM(UTC)
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beefcakefx

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The water level seems to be just below the screen. Is the screen or the perimeter holes the inlet? When I add water, I add enough to cover the screen.

Why do you suppose it's draining off the water I'm adding?
Appliance Ninja  
#6 Posted : Friday, November 15, 2013 5:10:12 PM(UTC)
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Appliance Ninja

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It drains at the start of the cycle, so if you totally stop the machine to add water, the cycle starts over.
beefcakefx  
#7 Posted : Friday, November 15, 2013 7:39:11 PM(UTC)
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beefcakefx

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I'm probably using the word "cycle" incorrectly. I should define a new term like "spool-up" to mean...

When the pump spools up from a stop and runs for a while. The pump seems to do this dozens of times during each cycle.

Now, if I replaced all the times I previously used "cycle" with "spool-up", it might translate better. My washer drains before each spool-up, so even if I add water during a cycle, it's drained off automatically during the next spool-up (5-10 min later) and the noise resumes.
Appliance Ninja  
#8 Posted : Friday, November 15, 2013 8:07:54 PM(UTC)
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So is the drain pump actually draining it or could it be siphoning out? Is the drain hose installed with a high loop or air gap?
beefcakefx  
#9 Posted : Saturday, November 16, 2013 5:15:36 AM(UTC)
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beefcakefx

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It's installed with a high loop.

I started it up again this morning. Immediately after filling, even before a first spool-up, it drains some of the water. So, it might be filling the right amount everytime, but draining some of it for some reason.
Appliance Ninja  
#10 Posted : Saturday, November 16, 2013 6:25:11 AM(UTC)
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So can you tell if the drain pump is turning on to drain it out?
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