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Thread: LG LDF6920 PF Error power failure - consistently halts mid-way through cycle

  1. #1
    Join Date
    Nov 2018
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    GA
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    Default LG LDF6920 PF Error power failure - consistently halts mid-way through cycle

    Model Number: LDF6920ST
    Brand: LG
    Age: 6-10 years

    My LG LDF6920 dishwasher goes through the wash portion of the cycle normally, including the filling, soap door release, and circulation. Then at the point where there are around 72 minutes remaining, it fully drains and shuts itself off. Turning power back on gets the "PF" error (power failure). Try to resume the cycle and eventually the same thing happens. I can usually get a "rinse only cycle" to complete, although the last time I tried it drained and powered off with 2 minutes remaining on the display. Sometimes I have noticed that after a premature shutdown the power button work for a couple of minutes... thermal overheat shutdown (?).

    I downloaded the service manual and went through all of the diagnostic button presses - all functions seemed normal, although I am not sure how to interpret the 62 reading for the soil sensor, and the dispenser test did not flip the soap door open (even though it opens fine during a regular cycle. The "auto off" test (13th press of the time button) does fully shut things off too, which I assume is the normal response.

    Any ideas?

  2. #2
    Join Date
    Feb 2019
    Location
    MI
    Posts
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    Default

    Did you ever figure out what the problem with your dishwasher was? Iím having the exact same problem on my LG.

  3. #3
    Join Date
    Nov 2018
    Location
    GA
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    Default

    Quote Originally Posted by josgre View Post
    Did you ever figure out what the problem with your dishwasher was? Iím having the exact same problem on my LG.
    Never did figure out what was wrong, and it eventually FULLY died, with no more response to pressing any of the buttons. I did have an appliance company come out and they took it apart enough to verify that power was still getting to the main board, and said only option they could try would be to replace the main board, but could not guarantee that would be a "cure" (for part cost + $150 installation fee). Then they called me a few days later to say that they were unable to obtain a new board. Have been manually washing dishes in the meantime while I debate whether to buy a board myself (I believe they ARE available online) and give it a try, or just buy a new appliance (more likely).

  4. #4
    Join Date
    Aug 2004
    Location
    McMullen Valley, Arizona
    Posts
    97,394

    Default

    Hi tustinfarm,

    Sorry, we must of missed your thread last November.

    That main control board for your model still looks to be out-of-stock:
    Main Control Board 6871DD1006Q


    I'd suggest buying a new dishwasher. I recommend Maytag dishwashers, that's what I own myself, and not a single problem with it at all since I bought it new in March 2014. Parts are easier to get for it too if you ever need them.

    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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