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FIXED WDF520PADM7 Whirlpool Dishwasher Circulation pump intermittent, Now not working

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Brett777

Premium Member
Joined
Jun 14, 2022
Messages
4
Location
Texas
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
 
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Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
132,461
Location
Redmond, Oregon
I located another thread with your exact same model and same problem:

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

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.
Screenshot 2022-06-14 21.46.59.png


Jake
 

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Brett777

Premium Member
Joined
Jun 14, 2022
Messages
4
Location
Texas
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

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
132,461
Location
Redmond, Oregon
Are your meter probes a little too big for the wash motor connector?

Try this first:
safety pin 500x250.jpg


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

Premium Member
Joined
Jun 14, 2022
Messages
4
Location
Texas
Thanks, just what I was looking for. Ordered the pump from the link you suggested.
 

Jake

Appliance Tech - Admin
Staff member
Joined
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Messages
132,461
Location
Redmond, Oregon
Ok, sounds good, let us know how it goes.

Jake
 

Brett777

Premium Member
Joined
Jun 14, 2022
Messages
4
Location
Texas
Replaced circulation pump. Checked wiring from control board.

Ran diagnostic cycle. Circulation pump ran, code cleared.

Thanks! Brett
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
132,461
Location
Redmond, Oregon
Excellent Brett, glad to hear the new Circulation Pump and Motor Assembly fixed it.(y)

Thanks for the update!

Jake
 
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