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Maytag dishwasher Model dwu7400aax. Serial # a1773911hu. front dial control. washer does not drain completely, leaves couple inches of water in bottom.


Answers :

Hi and welcome to FixYa, I am Kelly

Most of the time when you start having dirty dishes post wash there is either an internal blocked screen under the lower wash arm tower or a problem with the drain. The drain problem shows up mostly inside the Air-Gap cap or at the garbage disposal / sink port connection. Pull the cap / cover off of the Air-Gap and then NOTE the installed position of the inner cap. Unscrew the cap nut and lift the cap off of the Air-Gap assembly. Food particles block the drain inside the cap. You should see a blockage as soon as you lift the cap or the particulate falls away as you lift the cap. Look into the Air-Gap with a flash light and clear any debris. Re-install all Air-Gap parts after cleaning. Make sure to pull the hose off of the garbage disposal port and clean the port.

Add water via cycle fill and then test the drain cycle. The dishwasher should be empty in less than 90 seconds. After 90 seconds interrupt the drain cycle. There should NOT be standing water in the dishwasher sump. If you have standing water in the sump after 90 seconds you will have to remove the lower wash arm and tower to clean the screen or drain holes in the tower. (depending on modeL) Another thing to pay attention to is exactly HOW the lower wash arm is installed on the tower. Some of the 2 part lower wash arms can be a nightmare to re-assemble.
When in doubt take pictures first.... (Lesson learned the hard way too many times when a 30 minute job goes in to the 2nd hour on my time!) Just make sure you do NOT remove any motor pump mounting hardware where it mates to the tub base. Even loosening a motor pump bolt or screw can cause a leak after your done.

While the lower wash arm is removed make sure that you inspect and clean the inside of the wash arm. Often food particles can block the water spray holes in the wash arm.

IF you have a direct / no Air-Gap sink connection then pull off the hose at the sink connection and clear the connection hole of any debris.
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\015\012I really think that your have a drain problem vs a motor pump issue. It is possible that there is an impeller issue but at this point I doubt it.
\015\012
\015\012Should you have to gain access to the internal screen of the dishwasher you will need to view this link:
\015\012http://www.appliancepartspros.com/partsearch/model.aspx?model_id=28553&diagram_id=28395680#d28395680
\015\012Items I, 2, 3, 4, and 5 of the link will need to be removed then inspect the screen for signs of debris build up. \015\012 \015\012Again.. lets hope it does not get to the parts removal point. IF you do have to tear into the sump it is best to go down to the chopper place (Item 20 of link) and make sure the holes are not clogged. What ever happens unless your going to replace the impeller do not remove it or any seals. If you do you have a 50 - 50 chance of having a leak straight into the motor. Once removed it is best to replace both of the stem seals (Items 23 and 24).

One last thing to look for is clogged upper spray arm water holes. Just inspect for signs of blockage. Only remove it if you note food particulate in the holes.

I am speaking from many many years of in home appliance repair experience. The steps above should stop the dirty post wash dishes. If you still have the same issues after checking the above, please respond and I will help you.
\015\012Thanks for choosing FixYa,
Kelly
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