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WDT720PADM2 Whirlpool Dishwasher Fills but doesn’t wash in 1-hour cycle ONLY

Lots2Lurn

Premium Member
Joined
Apr 18, 2022
Messages
5
Location
New Albany, IN
Model Number
WDT720PADM2
Brand
Whirlpool
Age
1-5 years
Hello Jake,
This is my second Whirlpool dishwasher of late. About 3 years ago I repaired/replaced the fill control valve on the first unit and she has run perfectly since. I diagnosed by reading previously posted problems, so I have never posted until now. This model, my second Whirlpool dishwasher has an issue I can’t seem to find in previous posts. Thus, I’m seeking your expertise. I will explain the symptoms and my progress.
Back story;
I bought this unit used for $75. I was told by the young woman seller, who had a newborn, her first, it ran fine she just wanted a newer model with a baby bottle setting. I saw heavy white build-up in the tub, but I figured she used too much detergent and hard water caused this. And I’m familiar with how to clean and remove this buildup, so I bought it.
Symptoms;
After connecting the unit, before installing it into the cabinet, I simply opened the door (top door control panel) pressed START and closed the door to start a cycle in order to check for leaks. It filled with water (a few sputters as the fill line had air in it) and then began to wash. I checked for leaks while it ran washing. All was fine. I opened the door, held the START button 3 sec to initiate DRAIN and closed the door. It drained fine. I then proceeded to fully install the unit.
After completion, I then selected the shortest (1-HOUR) cycle, NO options, START and closed the door. It did the initial DRAIN and immediately filled as it should. And then, NO Washing. I would hear clicks from the control panel and the appropriate diverter movement, yet no circulation. I knew it had engaged and had been circulating fully during my test. I ran the diagnostic with results, FA, E1 and all F-, E- followed by the beep and a full test cycle in which circulation occurred. I then opened the door, pressed START, closed the door and it filled but no circulation. I let it complete the entire cycle. Each segment it would fill but never circulate. I repeated the diagnostic. Again, it circulated during the test. After a nights sleep, I deduced the unit must’ve been on a cycle other than 1-HOUR at first startup. I selected NORMAL cycle, NO options, START and the unit ran a complete cycle as it should.
I then ran the diagnostic again with the same results prior. The unit runs fine except on the 1-HOUR cycle and shows NO errors. I eagerly await your wisdom while I begin removing the buildup.

Thank you for your time and attention. I’m grateful to have such a reliable source of information.

J.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,104
Location
Redmond, Oregon
Remove the electrical connector to that circulation wash motor and put your meter probes in it and see if you get 120 volts after it fills, when it should be running. If so and the wash motor is not running, then that's the problem.
(click to enlarge)
dishwash120volts.jpg

Here's the wash motor assembly for your model you can order, if needed:
W11032770 Motor-Pump


Here's the video to replace it:
 

Lots2Lurn

Premium Member
Joined
Apr 18, 2022
Messages
5
Location
New Albany, IN
I checked the voltage, it is 120v. I’m now finding the unit is not recirculating in other cycles and is progressively getting worse. I’m going to order the entire Sump/Motor/Pump assembly as I think the price is not that different and I believe it may be easy to do the install. Which part should I order?
Do you have any tips for clearing ALL the water from the unit so I can lay it over for the install?

Thank you
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,104
Location
Redmond, Oregon
I’m going to order the entire Sump/Motor/Pump assembly as I think the price is not that different and I believe it may be easy to do the install. Which part should I order?
You are correct.:)

Here it is for your model:
WPW10671941 PUMP&MOTOR


Do you have any tips for clearing ALL the water from the unit so I can lay it over for the install?
A wet/dry vac works good.:)

You MIGHT be able to replace it without removing the dishwasher from the cabinet, watch this video, it gives you the general idea on how to do it:

Let us know how it goes.

Jake
 

Lots2Lurn

Premium Member
Joined
Apr 18, 2022
Messages
5
Location
New Albany, IN
Hello Everyone, Latest update;
After much research I have discovered this exact circulation pump is used in a multitude of brands and models. It has a documented history for failing as soon as 2 years old under certain conditions. Failure has been linked to hard water and use of excessive amounts of detergent over time. So, if you are replacing a failed pump take note of the causation to prevent repeat failure.
The failure is due to two graphite bushings on the motor armature.. They wear and allow wobble to the point of failure. I will report back after the install is complete.
 

Jake

Appliance Tech - Admin
Staff member
Joined
Aug 24, 2004
Messages
134,104
Location
Redmond, Oregon
Ok, yes let us know how it goes.

Jake
 
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