Question about LG WM3431 Front Load Washer / Dryer
My LG WM 3431 was working perfectly until recently when it stopped drying. I have cleaned the drain area as described by the manual, but it still does not dry. Also the dry cycle stops before the time orignially calculated.
Dryer / drying troubles - DIY repairs WD-12320RD /
WM3431H. It was difficult to find suitable solutions so I shall share
my experiences here. I live in Malaysia and purchased the LG
washer-dryer model WD-12320RD TROMM (240V) in January 2006. WD-12320RD
should be similar to WM3431H, just compare and verity features
available at LG's Singapore website http://sg.lge.com. However,
WD-12320RD model is no longer available locally. Both model's features
are essentially the same since I relied on the WM3431H service manual
downloaded from http://22.214.171.124/SubPages/DA_Laundry.htm for my
Fixing the machine would require relevant skills and plenty of common sense. Do this at your own risk and I am not responsible for your screw-ups.
Trouble date: January 2006
Symptoms: Damp clothes. Steam present when the door was opened and the door was also wet.
Solutions attempted: New washer-dryer drying under “Very” (More) didn’t worked. Machine was still under warranty and LG repairman was quick to respond and helpful. Diagnosed the problem to be a faulty PWB Assembly (main). Replaced PWB Assembly with a new version i.e. without “Cd” (cool down) feature. Machine worked as it should and clothes were dry even under “Cupboard” (Normal) mode.
Trouble date: March 2008
Symptoms: Similar to January 2006. Problem persisted, even after running drying cycle twice.
Solutions attempted: Dryer under “Very” (More) didn’t worked. First diagnosis, faulty Heater Assembly and Motor Assembly (Fan) located in dryer Duct (Inlet). Replaced the Thermostat Assembly, the Fan and also thoroughly cleaned the Duct Assembly (condensing). It was full of lint but no hairs, etc. Problem persisted.
Tried “Time” drying setting at 2h 30m and the drying worked a little better but the clothes were still slightly damp.
Tried Cupboard again and this time I observed the display was reduced to 10m or 6m after only ½h passed. Ran the cycle again but also used a separate kitchen timer as a reference control by setting both timers at 2h 30m. Confirmed the drying cycle ended abruptly in about 45m while the kitchen timer was still running.
Tried “Low Temp” mode and the drying cycle lasted between 3½h and 4h. During the drying cycle, time display would stay frozen at 6m when the actual time passed was more than 1h. Once completed, the clothes were dry but some steam was still present. The door was dry too.
Replaced the PWB Assembly and dryer worked again. Clothes were dry as toast.
Symptoms: Immediately after drying cycle, damp clothes, door is wet and steam present.
Recommended action: Try all drying modes, observe behaviour compare with the above. Use a separate timer as reference to confirm drying cycle ended abruptly. During cycle also observe whirring sound to be sure that the dryer fan motor was running and the top right hand side of the machine felt warm because of the heater. Thoroughly clean the Duct Assembly (condensing).
Tips on cleaning Duct Assembly: Unplug power cord and ensure machine is cool.
Step 1 - (note: for this step, very little guidance was found in manual) remove back panel to access the rubber bellows connecting the Duct Assembly to the tub. It should be located at the lower left side. Before removing the bellows, line the base with some towels in case Duct was flooded. Wash bellows thoroughly. Remove any other lint or visible obstructions from the Duct and tub openings. Re-attach and secure bellows.
Step 2 - remove the Heater Assembly and Fan covers to expose the heating element. Scrub the entire inside walls with moist toothbrush. Extend the handle if required. Don't use sharp objects to clean the Duct. It would be easier to remove lint if the inside walls were moisten with water using a manual spray pump. Exercise extreme care and do not wet other parts of the machine. Remove the loose lint and rinse entire area carefully using cups of water and all the remaining lint would flow down the Duct into the tub and later, exit through the drain hose. If the Duct is blocked, the water may fill up the Duct. Not to worry, try removing the obstruction (likely to be lint or hair) with a suitable tool, probably a stiff rod with a blunt, L-shaped end. Finally, clean by rinsing with water and dry the covers and Fan before re-assembling all the parts. Repeat Step 1 if necessary.
Recommended solution: If symptoms persist, most likely the PWB Assembly has conked out, even if it was a new machine as in my case and it appears to be so for many users as well.
User tips for best performance: Maximum load by volume, clothes should not exceed 70% of tub. When drying efficiency is affected, cleaning maintenance is required.
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please visit and leave a positive comment if your trouble was solved. tq.
Posted on Apr 27, 2008
I have found that most all front loaders have the same computer control board by a certain manufacture and that this board has a cracked solder issue around the relays.
It would require removing the top, marking the wires, removing board and re-freshing the solder around the relays.
Most techs just replace the board.
Others would tell you that it may be the heating coil or temperature thermostat . but these are working though intermittent .
the relay issue causes intermittent operation, incomplete cycles, random errors.
If you have someone that can do this I have some links for more info.
Posted on Jan 29, 2008
There is a known problem with these units in that they do not have a proper lint filter, so lint builds up inside the machine over time and slows down drying.
I have a guide of how to take apart the machine and remove the lint here:
It only takes about 30 minutes, maybe an hour the first time if you are nervous and being extra careful. I do this about twice a year and my machine has been working well for almost 10 years.
How to clean the lint out of a LGWM3431 dryer
Posted on Dec 01, 2015
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Posted on Jan 02, 2017
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