Question about Frigidaire 24 in. FDB421RF Built-in Dishwasher

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Not draining...hose clear

My dishwasher has been working great for years but stopped draining a few days ago. I have verified the drain hose is clear, air-gap is clear, hose from air-gap to garbage disposal is clear, and the knockout plug in the disposal has been correctly removed. My thinking is most likely the drain pump needs to be replaced. The dishwasher does make a slightly different sound than it used to when it enters the drain cycle. Anyone know of any other diagnosing I can do or other possible problems before I spend the money on a new drain pump? Thanks in advance.

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  • mjpalad Oct 09, 2007

    Thanks for the response. I saw an article athttp://www.acmehowto.com/howto/appliance... that talks about testing the pump with a multimeter. Does that seem like a legitimate test?

  • mjpalad Oct 16, 2007

    Just to update, I got a used drain pump from a local used appliance store and that did the trick. It sure was satisfying to see that water start pumping.  Thanks for the input bluegreenash.

  • Anonymous Mar 23, 2014

    We have cleared the drain and removed the hose from the sink. Is there a pump that drains the water. We also made sure garbage disposal was clear and working properly. The drain in kitchen working fine also.

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  • Master
  • 661 Answers

Not really, it sounds like you have done all the basics,

Posted on Oct 09, 2007

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After starting the dishwasher with time 56 min, the time goes down to 55 min and after that time remains 55 min. After few min there it showed 0E in the display bar and it stopped working. Is that...


1. If the drain hose is kinked, water will not drain properly. Kinks will also catch food debris as it passes, clogging drain hose. Straighten any kinks or bends in the hose. Make certain that drain hose does not exceed 10 feet for proper drainage.
2. Check the drain air gap anytime the dishwasher is not draining properly. if the air gap is clogged the unit will not drain. The air gap is not part of the dishwasher. It is located on the sink and attached through the drain hose and garbage disposal. Not all homes are required to have an air gap installed.
3. Food residue or particles can prevent proper draining of dishwasher. Remove bottom rack and check unit for food debris or items that may have fallen into the bottom of the unit. Remove any items or food debris that may be preventing proper drainage.
4. If the unit is not leveled properly, OE Error may occur. Use a level to check sides and top of unit. if the unit is not level, adjust the leveling legs in the front and back (use leveling kit). Also check the mounting brackets. If one is tightened more than the other, it will offset the cabinet.

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A re-post from John. I am reposting because I read this post this afternoon and it fixed my Miele incognito Dishwasher.
Hi All,

Thx for all the tips. Combining your thoughts provided a solution for me.

I had the same problem (with a ***** of thanksgiving dishes to do). Turn on,
tries to drain, then that RED blinking "INTAKE/DRAIN" light, like you described.

Spent hours, checking/clearing the (grey) drain hose (The other white hose is the water input to the dishwasher). Also took out metal filter, impeller cover, poked a coat hanger in both ways to/from the drain hose connection. All seemed clear. But still the same.

But when I unhooked the grey drain hose from the air gap unit (that part going to the 4th hole in the sink surface), the dishwasher worked fine. So the air gap unit seemed plugged. The black hose from the garbage disposal to the air gap unit is free flowing (blew through it - yuch!). But the drain connection through the air gap unit was NOT as free flowing.

Replaced it with a new air gap unit ($5.00 at Home depot).
All works fine now. I feel I got lucky.

Well this worked for me. Sorry for all of you who spent big bucks with no solution on those service guys that tried but did not help. I hope this helps some of you.

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My Bosch dishwasher SHX46A05UC is not draining


If the water is not draining from your dishwasher, verify the following:

Verify that there is not a clog in the drain hose or air gap. This is typically the reason that a dishwasher won't drain and the clog is usually where the drain hose attaches to the garbage disposal or sink drain pipe. Remove the hose and clear any clogs, then reinstall.

Verify that water from the sink drain is not making it's way into the dishwasher. I would recommend creating a high loop in the dishwasher drain pipe, which is attached to the sink drain, under the sink. The high loop can be fastened to underneath the countertop. This will prevent any water from entering the dishwasher from the sink; it also prevents the dishwasher drain water from making it's way back into the dishwasher
Verify that the pumps drain impeller is working. You can reach the impeller from inside the dishwasher after removing the lower rack, spray arm, and arm support. This typically involves removing a few screws. Once upper parts are removed, inspect the drain impeller, which pushes the water toward the drain port, for any cracks or missing blades. If the impeller is defective, the water will not drain properly and you would need to replace it.

Verify that the drain valve is working; many are controlled with an electric solenoid that opens the valve, sending the water to the drain. There is a chance that the solenoid or the diverting lever could be stuck which would prevent the water to drain. If so, try to free up the solenoid and lubricate the lever. Otherwise the solenoid or pump assembly may have to be replaced.

Verify that the motor is turning/ working and verify that there is power to the motor. If the motor hums but doesn't turn, it may need to be replaced. Motors can get stuck if not used regularly. If the motor is defective, the water will not drain and you would need to replace it.

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1 Answer

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1 Answer

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HI. check the following areas for fualts.

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If the drain hose is clogged, the dishwasher would not drain. If there is an air gap installed, it is very common that a hose going from the air gap into the garbage disposer is clogged. Remove and clean the hose. Make sure to reattach the hose before starting the dishwasher.

Note: If you recently had a garbage disposer installed, it is common to overlook removing the drain plug.

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If the motor is stuck, it is sometimes possible to free it up by manually spinning the motor.

Replace the motor if defective.

6. Timer
Replace if defective (note: uncommon problem).

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I had water at the bottom of my 4 year old plus dishwasher and of course I thought the worst. Did the pump go out, bad impeller, or what else could it be! I started with the easy stuff first and disconnected the drain lines. The drain line runs from the dishwasher to an air gap mounted to my sink, which keeps the drain line from getting an airlock. From the air gap device another larger line runs to the garbage disposal. I used an 8MM wrench to loosen the clamps enough to pull the drain lines off and drained them into a bucket. There really wasn't any resistance to water flow and no real chunks, I was disappointed.
I then took the actual air gap out of the sink by removing a large plastic nut and pulling the devise out from underneath the sink. When I inspected the air gap I saw a wad of hairy, feathery plastic stuff blocking the flow of water. I took the chunk out, reassembled everything and it works like new again.
It is a very easy fix and now even the area under the sink is clean to boot.

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