Drain Pump Spins but Doesn't Drain

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  #1  
Old 04-01-20, 05:25 PM
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Drain Pump Spins but Doesn't Drain

Hi,

I have an old Frigidaire dishwasher, model #FDB1050REC0 which stopped draining. I would like to have a better understanding of how does the draining works on dishwashers. I removed all of the inside components thinking that something was clogged but everything is clear. After checking the inside components I went and removed the drain pump, disassembled it breaking it into to parts when I could see the propeller, then I carefully hold the pump and turned the dishwasher in Rinse mode and to my surprise, the propeller spins, and it does spin fast, in- fact I went to the extremes and tried stopping it by touching it with a screwdriver while spinning (I know I know, crazy) and it seemed to be strong.

So now my question is, what else could be wrong if the drain pump seems to be fine, at least as far as I can tell? Are there other parts involved in the draining process?

Is it possible that even though the pump spins could be damaged?

Any help would greatly appreciate it.

This is the exact draining pump (Johnson SN-3125).

https://www.amazon.com/dp/B00E0CW0VQ...v_ov_lig_dp_it

Thanks!
 
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  #2  
Old 04-01-20, 05:39 PM
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Did you check for a clogged drain line.
The corrugated type hose gets clogged very easily in low areas.
 
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Old 04-01-20, 07:06 PM
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I did, itís cleared, I blowed air from one end to the other and air flows without any issues.

Could that be a faulty pump, even though the propeller spins?

I
 
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Old 04-01-20, 08:14 PM
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Usually if the pump spins..... it pumps.
Was there water coming out of the short connecting hose ?
Need to make sure water can drain from the sump to the pump.

Sears Parts Direct
 
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Old 04-02-20, 02:47 AM
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When you blew through the hose was it still attached to the house plumbing?
I have seen is clog at the house plumbing drain fitting and you could not see the plug with the drain tube detached.

Also just as a shot at left field did you just hook this up to a garbage disposal?
 
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  #6  
Old 04-02-20, 04:56 AM
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If the dishwasher is washing the pump is ok because the same pump is used for washing and draining. A solenoid is used to direct the pump output to the desired path. Make sure the solenoid is working.


Moderators note: This is incorrect as this unit has a wash pump and a drain pump.
 
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Last edited by PJmax; 04-02-20 at 09:15 AM.
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Old 04-02-20, 05:28 AM
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@PJmax I believe it did have water but I will give it a second inspection and see what I find.

@manden - Hose was disconnected from the house plumbing. The dishwasher is NOT connected to the garbage disposal, it connects to the second house plumbing.

@beelzebob - Based on the picture below, can you please confirm that the pump is used for washing and draining? Also, which is the solenoid?


 
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Last edited by fs_tigre; 04-02-20 at 05:46 AM.
  #8  
Old 04-02-20, 05:58 AM
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Was the back flow/flapper on the pump working correctly.
Also run your finger inside the drain hose connector that connects to the pump to be sure that there is not something in there that would stop the back flow flapper from opening.

The below may not be possible due to your set up.
Try draining it into a pail.
Put the drain hose end into a pail.
Be sure to hold it securely.
Also put a cloth/towel over the pail so it does not splash all over.
Then run a short cycle like rinse.

 
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Old 04-02-20, 06:08 AM
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@manden - I did not check the flapper, does that opens just by water pressure? What if I completely remove the flapper (cut it), is that really needed, is that just to prevent water from returning?
 
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Old 04-02-20, 06:30 AM
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Yes it opens and closes just by water pressure.

As far as I know all it does is keep the drain hose water from running back into the unit.
I do not know if removing it will cause a problem as I have never doe it.
My gut says it should not cause any problems.

I do not think that you should have to cut it out but should be abke to remove it so if thre is a problem down the road you an reinstall it.
I believe it is held in by a little tab that fits into a slot.
 
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Old 04-02-20, 06:40 AM
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Oh, I didn't know it could be removed.

FYI -One thing I forgot to mention in my original post is that I found two small rusted screws inside the pump, I'm not sure where they came from. They were before the propeller just sitting in there.
 
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Old 04-02-20, 06:57 AM
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One thing I also should mention without the back flow flapper it ma leave some water in the bottom of the dishwasher. Depends on the drain hose route.

Since the screws were rusted I doubt they came from inside the unit.
 
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Old 04-02-20, 09:16 AM
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A don't see any flapper here. I see a check ball that must be used.
 
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Old 04-02-20, 09:30 AM
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You can just see it in the drain pump exit in his second picture.

The following site gives better views of the pump than sears.

https://www.appliancepartspros.com/f...ap5690432.html

 
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Old 04-02-20, 09:37 AM
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You're talking about a flapper on the pump ?
That either opens or it doesn't. I've never seen one stuck before.
 
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Old 04-02-20, 10:48 AM
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Could have the impeller broken loose from shaft. Have seen this many times in clothes washers.
 
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Old 04-02-20, 04:29 PM
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I took apart the drain pump again and this time I noticed that even if it does spin, it spins, slower than what I would expect, and this time I was able to easily stop the propeller with my finger without any force.

Have any of you seen a propeller that spins but not at the speed it should? In other words, could that be a sign that the pump is daying?

Thanks!
 
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Old 04-02-20, 05:55 PM
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I would replace the pump.
 
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Old 04-02-20, 08:30 PM
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I agree. Replace the pump. You should not be able to stop it with your finger.
 
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Old 04-03-20, 08:56 AM
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PJmax, I based my comments based on the parts diagram for model FDB1050REC0 listed at Repair Clinic. They list one pump and one motor. If this is in error, provide me with the correct info and I will contact Repair Clinic.
 
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Old 04-04-20, 06:25 AM
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I'll order a new pump. Thank you all very much for your help, I really appreciate it.
 
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Old 04-04-20, 09:20 AM
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Repair Clinic information is correct. They do show a drain pump and a wash pump.

Repair Clinic product detail
 
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Old 04-09-20, 08:10 AM
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Update: Replaced the water pump and it fixed the issue. Thank you all very much for your help.
 
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Old 04-09-20, 10:56 AM
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Good job. Thanks for letting us know how you made out.
 
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