Question about LG WM3677HW 3.7 cu.ft. Front Load Washer and Dryer

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My LG Tromm washer dryer ( WM3677HW or WD-12270RD) is showing an OF (overfill) alert during the dry cycle. The wash tank will properly drain during a rinse/spin cycle. What component needs to be replaced?

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    I'm not aware of any "OF" error code for this machine. Are you sure it isnt "OE"?

  • efm_fixya Jan 03, 2011

    The error is FE.

    It works fine except in drying mode, instead of squirting a little water in, it runs the input tap for far longer than it used to. it will drain as normal, but because it's filling for so long, eventually it fills up the tub, at which time it generates an FE.
    i thought it might be that the valve was sticking but i put a multimeter on the inputs, and it is getting voltage for an extended period.

  • efm_fixya Jan 04, 2011

    The water frequency value is working as you describe, showing different values depending on how much water is in the basin. It does indeed read the appropriate value when the tub has lots of water in it and the other when it has been drained.

    The exact thing that is happening is that everything works fine for a wash and spin cycle, but it fails during the dry cycle. it has always run the inlet for a few seconds, then after a bit run the drain for a few second, and repeated this during the drying. What has changed is that now it is running the inlet for more like 20 seconds, and the drain still for 2 seconds. After a while of this, the basin just gets more and more full until water is several inches up on the "window" in the front and it gives the FE.

    I thought maybe the inlet solenoid or valve was stuck, so I put a multimeter on it and it is definitely being told to keep the valve open for that long, it goes high and water starts flowing, and stay high, then as soon as it goes low the valve closes.

    So I'm figuring it's either the controller or a sensor that is giving the controller faulty data causing it to run the inlet for far too long, but looking at the block circuit diagram I can't imagine what it is.

  • efm_fixya Jan 04, 2011

    The drain pump is running normally, it's like there is a lot more water than uual flowing in during drying.



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According to the manual "water is overflowing (water level frequency is over 213). If FE is displayed, the drain pump will operate to drain the water automatically". Since there's nothing between the water inlet valves and the PWB I'd suspect that, but not before putting it into Test Mode to rule out other components and especially checking the water level detector switch

The water level detector switch monitors the water level and feeds this information to the MICOM. The sensor reads air pressure in an air chamber on

the tub. The air pressure changes in relation to the depth of the water, moving a diaphragm in the switch. As the water level fluctuates, it raises or lowers the iron center in the coil, which, in turn, changes the electric resonance of the oscillator circuit of which it is a part. As water level decreases, frequency increases. (e.g. A low water level may read 25.5kHz1 while a high water level may read 21.4 kHz. These readings are approximate; washers in the field may vary slightly from these figures.)

To read the frequency while the COMBO is running, press and hold the SPIN SPEED and SOIL LEVEL buttons. The number on the display should be divided

by 10 to obtain the frequency reading in kHz. A display of 254 would indicate a frequency of 25.4 kHz. The MICOM interprets the frequency reading as one of

eight levels, with one being the lowest water level and any level greater than eight indicating an overflow situation.

Posted on Jan 04, 2011

  • 1 more comment 

    It sounds like a problem with the condensation water inlet. I'll pass this on to my collegues and see if anyone's heard of this


    I think I'm getting somewhere. "Water inlet valve is energized approx. 80% of the time during the DRY cycle • The Drain Pump is energized every 30 seconds for approx. 2-3 seconds pumping approx. 4 oz. (8 oz. every minute) • Water is used to cool duct and remove lint" You should look at the condensation tube for a buildup of lint which is why it won't drain


    The reason for checking the water frequency was to determine the proper amount of water. This design does use water during the dry process to cool the duct assembly and remove moisture from the air stream. According to the information posted earlier, water running 80% of the time during the dry cycle is normal. If, as I suspect, a buildup of lint prevents this water from draining propelry it will trigger the error you are getting



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