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LG WM3987HW Combo - drum is filling with water during dry cycle.

During the dry cycle on my lg combo drum randomly fills with water to the point it gets an error FE. cloths can be 95 percent dry and the next minute it's dumping water into the drum. water appears to be flowing into the drum near the detergent drawer. I am thinking one of the valves is opening and i suspect the pre-wash valve. I am assuming that valve is normally closed and has no business opening during the dry cycle, unless it's getting bad signal, the control board is my thought. i power unit off and back on, clear the FE, run a rinse and spin to get the water out of the tub. i then set a separate dry cycle to run for 30 minutes, of course it has to spin first for awhile before dryer kicks in. during this spin cycle i observed the pre-wash valve open and close a bunch of times, had top cover off. again why is the pre-wash valve opening and adding water during a spin cycle. is the pre-wash valve used during other cycles other then the pre-wash cycle? at no time was pre-wash selected. again thinking bad signal from main circuit board. any thoughts? anyone have a schematic diagram of the control board? I have the block diagram from the service manual but would like to look at the circuits in more detail. I have cleaned out all lint filters, rubber seal, and condensation tube. machine settings: cotton/normal wash/rinse warm/cold spin speed high soil level normal dry 30

Posted by Neal on

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1 Answer

Cindy Wells

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Sears Parts Direct is one source of the parts diagrams, https://www.searspartsdirect.com/model/1vc37q1bdj-003204/lg-wm3987hw-washer-parts . See the Dispenser assembly parts diagram for the water inlet valve. If you can watch the entire cycle, try turning off the shut-off valves for the washer inlet hoses after the rinse cycle and before the dry cycle starts. Water should not flow into the washer/dryer with the shut-offs closed.

I've seen inlet valve solenoids fail in the open position or in the closed position. I've never seen a control board that sent open messages randomly. (Sometimes, there is damage to the control board or corrosion or damaged wiring that stops the control board from sending the open/closed message to the solenoid.)

I hope this helps.

Cindy Wells

Posted on Nov 19, 2021

  • 2 more comments 
  • Neal
    Neal Nov 19, 2021

    i'm certain water will not flow into the washer/dryer if water is shut off. can i run the dry cycle with the water off? i know the unit uses water flowing through the dry valve to cool and condense the moisture in the outlet duct. i was also thinking about just unplugging the pre-wash valve and see what happens. that should not be needed other then for the pre-wash cycle which i never use.

  • Cindy Wells Nov 20, 2021

    The worst that should happen is the dry cycle will stop with a different error code. I've never tried disabling one of the two inlet valves in the washer. I'm not sure if that would trigger a IE error or not. However, I'd be somewhat wary of the unit overheating. I'd want someone paying attention to the machine to stop the dryer cycle quickly. Cindy Wells

  • Neal
    Neal Nov 20, 2021

    I would just unplug the prewash solenoid. Still have four valves including dry valve working.

  • Cindy Wells Nov 21, 2021

    As I said, I've never tried that during my diagnostics. I've had more inlet errors than solenoids when failing open. Cindy Wells

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I got the company link from LG. If the link does not work, go the the main website and enter in the model number. appliancepartspro(.)com
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