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- > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > Bosch Dishwasher Model SHE44C05UC won't drain

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Bosch Dishwasher Model SHE44C05UC won't drain  Rating:  Rating
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 Posted: Fri Nov 5th, 2010 12:13 am
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jshepard
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:( Bosch Dishwasher won't drain. We've had the dishwasher for 3 or 4 years and nothing has been changed recently. I've read several posts related to this and believe that the drain pump may need to be replaced. What I have done so far:

1. removed kick plate, pulled drain hose out and blew through it. nothing is blocking the hose.

2. removed plastic cover over the impeller. impeller turns freely.

3. pressed SCRUB WASH and REGULAR WASH buttons simultaneously to cancel the cycle and drain the dishwasher. It does not drain. However, it makes a sound like it is draining. When I open the dishwasher while it it making this sound, the water is moving around and it looks like the impeller is working.

My questions are:

1. Since the impeller appears to be working, does that mean the drain pump is functioning?

2. Despite appearances, if the drain pump is not functioning, is this something I should attempt? Based on the posts, it sounds daunting. If I can avoid a service call, I would be happy to pay those who assist me successfully fix this.

thanks

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 Posted: Fri Nov 5th, 2010 01:03 am
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Impeller could be busted off at the motor shaft, spins free because it is.........

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 Posted: Fri Nov 5th, 2010 01:11 pm
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jshepard
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By "spin freely" I did not mean it did not have any resistance. I meant that it turned and apparently does not have anything blocking it. I understand that it is magnetized and I can feel that it has resistance twice per revolution that feels like magnetic resistance. Also, if it is broken, why does it churn the water when it is in the draining cycle (although water does not drain)

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 Posted: Fri Nov 5th, 2010 05:29 pm
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Drain hose is suspect. Pull the drain hose off the drain pump discharge port and pucker up and blow. After an initial slug of water, the hose should blow thru easily. If not, then you're goin' clog hunting.



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 Posted: Fri Nov 5th, 2010 06:30 pm
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jshepard
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thanks. I checked the drain hose for blockage. First, I bailed the water out of the dishwasher. Then I pulled the drain hose out of the drain port and blew through it. There was not any blockage. In fact, there wasn't even any water in it.

Then I attached a separate hose to the drain port with duct tape and put the other end into a very small bucket. I then poured some water into the dishwasher. I ran the cancel/drain cycle in order to get the dishwasher to drain. I would occasionally open the dishwasher while it was attempting to drain and it certainly looks like the impeller is working. However, no water is being forced into the hose that I have attached to it. Water is draining out but only through gravity.

Is there another part besides the impeller that forces the water out of the dishwasher? Is there a pump that could have failed? I can't find any schematics of the dishwasher to see what that impeller motor is supposed to do.

thanks

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 Posted: Fri Nov 5th, 2010 07:18 pm
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Those drain pumps can and do go bad. Make sure it's getting voltage. Can also pull the pump out and run it separately like I did here==> http://fixitnow.com/wp/2010/09/02/appliance-war-story-whirlpool-kitchenaid-and-some-kenmores-dishwasher-not-draining-bad-drain-pump/

Different dishwasher but same technique.

Drain pump part link==> http://www.repairclinic.com/PartDetail/Drain-Pump-and-Motor/935403?modelNumber=SHE44C05



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 Posted: Fri Nov 5th, 2010 08:08 pm
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jshepard
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that video is very interesting. just so I understand:

1. the impeller is the drain pump. If the impeller works, then the drain pump is working.

2. From your video I understand that the impeller can spin and it still may not be functioning properly. That is what is interesting in your video. the impeller is spinning but you say it is a bad pump.

3. I will try to check the voltage. it is difficult to get to the leads under this bosch dishwasher. meanwhile, if the impeller is spinning when it is in the drain cycle and it is not draining (assuming there is no blockage in the drain hose), is it pretty certain that the motor needs to be replaced? it looks difficult to replace and I may just need to get a repair guy to do it.

thanks for the info

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 Posted: Fri Nov 5th, 2010 08:11 pm
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The impeller is *attached* to the drain pump motor, yes. :)

It's the sounds that gives it away. These motors run very quietly. Yes, the impeller spins but it's not only noisy but it's binding while running. Watch it again. Impeller should spin smooth, steady, and silent.



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 Posted: Fri Nov 5th, 2010 09:41 pm
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jshepard
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This is tough for me to determine. I just don't have experience with a properly functioning impeller. It seems to run smoothly and quietly, but there is noise because the water is churning. It stops and starts but I am not sure if that is because it is not functioning properly or because the drain cycle stops and starts. In any case, it is not forcing water out of the drain. it seems an inefficient way to force the water out. to me it just looks like the impeller spins and simply churns the water. I can really understand how it forces anything out.

In any case, I have to assume it needs to be replaced and I don't think that is easy to do. It has to be done underneath the dishwasher, correct? I would have to pull the washer out and turn it upside down, correct? That seems difficult.

thanks for the information in any case.

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 Posted: Sat Nov 6th, 2010 12:43 am
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from the Bosch Dishwasher service manual:

Drain pumps are mounted to sumps in the front of dishwashers --
they’re easily accessible from the front of dishwashers by removing toe kicks.

Removing & installing drain pump:

􀂃 Remove toe kick, then pull up terminal cover and disconnect wires.
For easier access, remove base cover 1st.

􀂃 To remove pump, push latch (on circular collar) & rotate pump clockwise (cw).
To install new pump, insert @ 2:00 position & rotate counterclockwise (ccw).

􀂃 Clean water & debris from base, then check float operation.

􀂃 Connect wires, then install base cover & toe kick.

 
For service manuals and lots of other goodies, become an Apprentice==>
http://apprentice.applianceguru.com




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 Posted: Sat Nov 6th, 2010 01:28 pm
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Are you by any chance trying to test it without putting the pump inlet cover back on, I ask this because you say, "When I open the dishwasher while it it making this sound, the water is moving around and it looks like the impeller is working."

If you can see the impeller working then you would have to have the inlet cover off.

It will not drain with the cover off, it can't build up the friction between the impeller and water trapped by cover to start enough pressure to force water out.




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 Posted: Sat Nov 6th, 2010 02:42 pm
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Samurai Appliance Repair Man
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Impeller should not stop at all when you're running it outside the dw for testing.

Super easy job to replace. They clip in and out bayonette style. See Reg's instructions.



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