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Dishwasher works and drains ok, but as it sits unused, dirty water backs up into the dishwasher from the bottom drain. Sink and garbage disposal not clogged, 2 separate drain pipes.Do I need a plumber or appliance repair person?

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  • 56 Answers

If the water is dirty you need a plumber, if clean appliance repair tech.

Posted on Feb 08, 2010

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Posted on Jan 02, 2017

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3 Answers

Water backs up from the drain in my dishwasher and smells. what is the problem?


Two things can cause this problem:
1. The check valve in your dishwasher may be defective, allowing water and food debris to seep (or run) back into your dishwasher.
2. Your drain hose may not be "mounted up" the way it should be. Look under your sink. Look at how your drain hose is connected to your garbage disposal. If the hose runs down to the floor of your cabinet and into your dishwasher, that is wrong. Instead, it should be mounted up so that water from the sink and garbage disposal would have to flow up first to get into the dishwasher. If you do this, then even if you have a bad check-valve in the dishwasher, it will prevent the problem (or greatly reduce the problem) of dirty water flowing back into your dishwasher.

May 17, 2015 | Kenmore Elite Stainless Steel 24" BuiltIn...

1 Answer

When dishwasher is emptying it is backing into sink


there is probably nothing wrong with Dishwasher itself.
Your Sink drain is stopped up or your Garbage disposal is clogged.
usually, dishwasher drain is connected to the Garbage Disposal, but if the dishwasher empties the water into the Garbage disposal, if its clogged then water will come out of the sink. Same if sink is clogged between sink and sewer.


If you fill up your sink and then water drains away, then you know your sink itself is not the problem. If its only the Garbage disposal side that does not drain, its the garbage disposal that is clogged.

Dec 22, 2013 | Dishwashers

1 Answer

Our sink and garbage disposal was clogged up. We got the sink unclogged, but the dishwasher had dirty water in the bottom and won't drain.


Your dishwasher drains into the garbage disposal. It you tried to use a plunger to clear your clogged sink or run the disposal with to much junk in it you may have force debris into the dishwasher drain hose. With both the dishwasher and garbage disposal disconnect from power disconnect the dishwasher drain hose from the garbage disposal. This is usually about a one inch black hose. Clear out any debris in the hose and inlet nipple on the garbage disposal. If debris is compacted far down the hose it will need to be disconnected from the dishwasher end and remove to clear the blockage.

Good luck!
Steve

Feb 10, 2012 | Asko 1385 Dishwasher

1 Answer

Water did not drain from the bottom


Hello Cheryl, There are a couple of possibilities. When the dishwasher drains the dirty water it is a time based function. This leads me to believe it is a blockage or partial blockage in the drain hose.
Here is an example. (If your dishwasher drains into your garbage disposal) washing dishes you put scraps into the disposal and forget to turn it on after you are done. The disposal is filled with scraps this restricts the flow of dirty waterfrom the dishwasher. If the flow is restricted less water is being drained per second from the dishwasher. This is why the dishes still looked clean and there was still water in the bottom of the dishwasher.
(if your dishwasher drains into a drain pipe) there is blockage or partial blockagein the dishwasher drain hose. if the sink drains slowly the blockage is in the main line
Hope this helps
Joe Connolly

Nov 02, 2011 | Frigidaire Dishwashers

1 Answer

My dishwasher is not draining completely. There seems to be more water left than last time I used it. Also, I tried to used the cancel/drain feature, with no success. Please give me some suggestions!


Hi and welcome to FixYa, I am Kelly

The drainage problems are caused by particulate in the drain.

There are 3 areas that cause restrictions with larger food particulate
1. The Air-Gap (if equipped) but the most common blockage point,
2. The sink connection. This is usually a garbage disposal connection. If the user is not properly rinsing long enough while the garbage disposal is in use the garbage disposal / dishwasher connection port is blocked with garbage disposal debris.
3. The bottom of the dishwasher sump area under the lower wash arm. If this area is blocked the user will complain of dirty dishes post cycle, It also causes drainage problems, If the user says dishes are not getting clean and it is not draining properly this will be the LAST area to check. Do 1 and 2 first.

I have had multiple call backs on some units... I have learned to call a brief moment before stopping by and inspect the DIRTY dishes in the dishwasher, the sump, air-gap and sink connection. Most of the time I find that the user is placing dishes with large food particulate in the dishwasher or... they are not letting the water run long enough when using the garbage disposal so the garbage disposal port clogs. These are the same folks that have things like pump impellers and pump housings that get broken due to their daily routine habits.

You wil have to clean all of the drain connections for the dishwasher pump outlet all the way to the sink connection. The Air-Gap is the most common area for blockages so pull off the cover.. unscrew the inner top nut NOTING the installed position BEFORE removal and clean out the Air-Gap (if you have one) Otherwise remove the drain hose at each connection and remove the debris. It is OK ot reconnect each connection after your done cleaning. This will solve about 85% of dishwasher drain problems. The last 15% the lower wash arm and support has to be removed to inspect for pump impeller damage or motor pump housing damage.

FYI the 2nd most common reason for drain problems is the actual sink port connection being clogged. Just clean the drain hose connection ports and the air-gap.

I think once you get all of your drain connections cleaned that your dishwasher will operate normally.

Thanks for choosing FixYa,
Kelly

Jun 17, 2011 | Whirlpool Dishwashers

2 Answers

2 weeks ago, I had a plumber come and put in a new garbage diposer and since then somewhat old/dirty water seems to be sitting at the bottom after all cycles are done. I calle dhim back and he says that...


There is a breakaway stub in the garbage disposal's dishwasher hose port, it needs to be removed before connecting the dishwasher drain hose when installing the disposal.
Disconnect the dishwasher drain hose at the disposal, get a screwdriver and, insert in the disposal's dishwasher drain port and tap on it with hammer until it breaks off. Then remove that stub from the sink side.

Oct 14, 2009 | GE 24 in. Profile PDW7800 Built-in...

1 Answer

Once my dishwasher completed the cycle there is no water but after two or three days the bottom of the dishwasher fills with the dirty water. what could be the reason? I have garbage disposal and one pipe...


You must have your dishwasher connected directly to the garbage disposal and not through an air gap. What is happening is when you disposal fills with water it is siphoning through the drain hose back to the dishwasher. If you sink has a spare hole on the deck install air gap and run dishwasher drain through air gap first. Otherwise make sure you run Garbage disposal often so that water does not get slowed and build up inside.

May 11, 2009 | Frigidaire 24 in. FDBB944C Built-in...

1 Answer

Water does not drain from unit.


  • Check sink drain and drain hose for restrictions
  • Unjam the motor
  • Unjam the pump
  • Check the drain valve
  • Check the drive belt
  • Test the timer motor
  • If you have a brand new dishwasher or garbage disposer, check the knock out plug on the garbage disposer.

Apr 11, 2009 | Dishwashers

1 Answer

Dishwasher does not drain completely, has standing water after every complete cycle.


  • Some water, usually one to two cups, remaining in the bottom of the tub is normal. However, if water is covering the bottom of the tub, the dishwasher is not draining properly.

  • Check for paper or large objects covering or blocking the sump area in the rear of the tub.

  • Make sure that the right type and amount of detergent is used: Using the wrong type or too much detergent can cause sudsing that can prevent the dishwasher from draining. Only detergent specifically designed for automatic dishwashers such as Electrasol®, Cascade® or Cascade Complete® should be used. If you find suds in the dishwasher.

  • Check disposer plug. If a garbage disposer has been recently installed, it is possible the disposer drain plug was not removed. The drain plug is a plastic piece in the disposer that blocks the hole where the dishwasher hose connects.

    Please consult the Owner's Manual. Download a free copy of the Owners Manual and/or Installation Instructions. In the Installation Instructions, will be the procedure for removal of the drain plug. You may also check with the installer.


  • Be sure the kitchen sink drain is not clogged. The dishwasher typically drains into the kitchen sink drain or a garbage disposer. If the dishwasher drains into a garbage disposer, run the disposer to clear the drain system. Do not put hands into the garbage disposer. Serious injury could result. You should always turn on your garbage disposer prior to running the dishwasher to clean out any food or debris within the drain system.

  • Check drain hose where it connects below the sink for blockage or a kink in the hose. New dishwashers come with a white corrugated drain hose, which should be used. Re-using old, worn out drain hoses may promote kinking and blockage. If it is neccessary to extend the length of the corrugated drain hose, be sure the total length does not exceed 120 inches and the extention used is not kinked or crushed. See your dishwasher installation instructions for details.

  • Check the air gap if one is installed. It could be clogged. An air gap (not part of the dishwasher) is usually located on top of the sink. Some state or local plumbing codes require the use of an air gap between the built-in dishwasher and the drain system of the home. This plumbing device is used to prevent the possibility of back flow into the dishwasher in the event of a clogged drain system. This item is not a part of the dishwasher and, therefore, the dishwasher warranty does not cover costs related to cleaning or repairing a drain air gap.

  • Typical air gaps are easy to inspect and clean. Be sure the dishwasher latch is in the OFF position or unlatched prior to removal of the drain air gap cover. Simply lift off the cover (usually chrome, could plastic) and unscrew or unsnap (depending on type of air gap) the plastic cap below. Remove any material that may have accumulated and replace the plastic cap and chrome cover. This simple procedure should be followed any time the dishwasher fails to drain properly.

    View a short video about cleaning the air gap:
    Play Video

    Sometimes perceived "no drain" problems are not "no drain" problems at all, but back flow of water from the sink or some other device into the dishwasher:

  • If you notice dirty water building up over time in the bottom of the dishwasher and do not have an air gap, make sure you have a high drain loop. A high drain loop is created when the drain hose is makes a loop at least 18 inches above the floor. Usually this is accomplished by attaching the drain hose to the underside of the countertop. Without a high drain loop or air gap, dirty water from the sink can flow into the dishwasher. The high drain loop prevents back flow of water from the drain into the dishwasher if an air gap is not installed. View a short video about a high drain loop:
    Play Video

May 08, 2008 | Dishwashers

2 Answers

Dishwasher did not drain all the water


Your sink drain is clogged and the back pressure is not allowing the dishwasher to drain competely. Do not use a liquide drain cleaner, it will damage your disposal. take apart p-trap hopefully the clog is there, otherwise the line will need to be snaked.

Sep 22, 2007 | Roper 24 in. RUD4000M Built-in Dishwasher

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