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Thread: WDT720PADB2 Whirlpool Gold series dishwasher erratic behavior

  1. #1
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    Default WDT720PADB2 Whirlpool Gold series dishwasher erratic behavior

    Model Number: WDT720PADB2
    Brand: Whirlpool
    Age: 1-5 years

    I have a Whirlpool Gold series dishwasher (WDT720PADB2). At about one year mark it started behaving erratically, where independent of the cycle selected, it would sometimes fill up with water but then just sit for the rest of the cycle without doing anything, and finally drain at the end as if everything was fine. Sometimes restarting the cycle multiple times would induce it to run but sometimes not.

    Based on the fact that it sometimes completed the cycle successfully I surmised that the hardware must be fine and proceeded to replace the control board. With the new control board the dishwasher seemed to regain some consistency and for a couple of weeks completed the wash cycle successfully every time. This didn't last long though and within a month it was back to the old one-try-out-of-ten behavior.

    Following directions provided here https://www.applianceblog.com/... I ran the diagnostic cycle and noticed that it displayed two different error conditions F7 E1 and F3 E3. This service pointer document https://www.scribd.com/documen... indicates that the first is a fault related to the heat sensor but says that other faults should be diagnosed first as this fault may not be the root cause of failure. The second error code is related to water flow problems: either failure to drain due to pump issues (seems unlikely given the symptoms) or water flow sensor malfunction. But I could not find any document detailing what exactly the E3 code means. Only that F3 is related to a water flow issue.

    Following advice received on a different forum I checked the float switch but it turned out to be in perfect working order. I am thinking about replacing the turbidity sensor (OWI). Is this a sensible thing to do? Has anyone else run into this kind of an issue?

    Thanks,
    Dan
    Last edited by dgenin; October 12th, 2017 at 08:14 AM.

  2. #2
    Join Date
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    McMullen Valley, Arizona
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    Default

    Hi Dan,

    it would sometimes fill up with water but then just sit for the rest of the cycle without doing anything
    There has been quite a few of these wash motors going bad. That's likely what has happened to yours when the wash doesn't start.

    You will need a multimeter to verify that first.


    Look at post #7 here: FIXED 665.13472N411 What to check on why it only washes about 5% of the cycle.

    I'd first check to see if your getting 120 volts to the wash motor when it should be in the wash cycle. His Kenmore 665 made by Whirlpool uses the exact same wash motor yours does.

    Take the wire connector off the wash motor and use your multimeter to see if yours is getting 120 volts when it should be washing, if so and it's not running order the wash motor.

    Here's the wash motor assembly for your model you can order:
    Pump and motor assembly W11032770


    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

  3. #3
    Join Date
    Oct 2017
    Location
    MD
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    Default

    Replaced the motor, though the old motor didn't seem to be completely broken. I was able to get it to run by connecting it directly to the outlet.

    It seemed like the problem was fixed but the dishwasher is starting to exhibit some of the old behavior. Today in the middle of the cycle I could hear the motor running but there was no sound of water from the spray arms hitting the sides, which I can normally hear. Also, the motor was making a different sound, as if it was running dry. I say that because I ran the new motor dry, briefly, before installing it to compare to the old motor.

    The diagnostic cycle fails to finish, stopping in period 5, I think, with display going completely dark and no activity of any kind. When I opened the dishwasher the heating element was hot, with the drops from the upper rack hissing on contact with it, but no water at the bottom and no water spraying. I tried running the diagnostic cycle several times and it always ended this way. The error codes displayed at the beginning of the cycle were F7E1 and F9E1.

    It's still washing the dishes OK for now with occasional failures that can be corrected by stopping and resuming the cycle (sometimes several times). But I am worried it's going to return to its old ways when we were able to get to it to run successfully only once out of 10 starts.

  4. #4
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    Replaced the motor, though the old motor didn't seem to be completely broken. I was able to get it to run by connecting it directly to the outlet.
    Why did you replace the motor?, was something else wrong with it?

    bigbuck mentioned to Disconnect the vent wires and then try to run it and see if it completes a whole wash cycle. And see if it runs through the complete diagnostics cycle.

    If so then you will need a new vent assembly.

    Here's the vent assembly for your model you can order if needed:
    WPW10428211 Vent


    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

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