FIXED WDF520PADM7 Whirlpool Dishwasher Circulation pump intermittent, Now not working

[Brett777]

Model Number

WDF520PADM7

Brand

Whirlpool

Age

1-5 years

Circulation pump resistance is 7.7 ohms. I removed it from machine and applied 120 volts to it and it worked. Reinstalled and added a "tap" to each of the motor leads so I could confirm voltage to the pump during operation. It pumped, but the voltage was 70 volts. I then cycled the dishwasher several times, and the pump never again came on.

Replaced the control board. My thought was that there was a problem with the relay contacts to the circulation pump. The new control board did not help. (Did I get a defective one?)

When the washer is running, and it's time for the circulation pump to come on, the voltage to the pump pulses for about once a second for three times and shows 0 voltage. I don't hear the motor run during these pulses. The DMV never actually locks onto the voltage. The error code is 43.
Thanks

 

[Jake]

I located another thread with your exact same model and same problem:

FIXED - Whirlpool Dishwasher WDF520PADM7 - Fills then nothing

Daughter called Dad for help, now Dad reaches out for advice. I suspect this is the motor. I will check for 110v to the motor. Does this model have any indicators to show the issue? Anything else to check for this type of issue?

www.applianceblog.com

Looks like they changed the part number of that Circulation Pump and Motor Assembly from W10879262 to this one:

Whirlpool W11612326 Mp Pmsm Pw Nar Askoll (AP7193729) - AppliancePartsPros.com

Mp pmsm pw nar askoll W11612326 / AP7193729 made by Whirlpool

click.linksynergy.com

Here's the one they still show at RepairClinic:
Circulation Pump and Motor Assembly W10879262


Here's your tech data sheet, error 4-3 is a wash motor problem, look on Page 7.

Jake

 

[Brett777]

Thanks Jake.

I searched the forum first and checked out that thread. I also went through the tech sheet
that came with the DW. My question is, why is there not 120 volts at the circulation motor
during the wash cycle if the control board is good (and the wash pump is bad)?

 

[Jake]

Are your meter probes a little too big for the wash motor connector?

Try this first:

If you still don't get 120 volts, check your wiring from the control board to the wash motor for a short.

P5-1 to P5-2 on the control board itself sends 120 volts to the wash motor, you can test voltage at the control board directly too.

Jake

 

[Brett777]

Thanks, just what I was looking for. Ordered the pump from the link you suggested.

 

[Jake]

Ok, sounds good, let us know how it goes.

Jake

 

[Brett777]

Replaced circulation pump. Checked wiring from control board.

Ran diagnostic cycle. Circulation pump ran, code cleared.

Thanks! Brett

 

[Jake]

Excellent Brett, glad to hear the new Circulation Pump and Motor Assembly fixed it.

Thanks for the update!

Jake