Question about LG WM3431H Washer and Dryer

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My LG WM3431H All-In-One Washer and Dryer won't dry


My LG WM3431H All-In-One Washer and Dryer, which I have had for a little over a year, has stopped drying the clothes. It goes through the whole drying cycle and the clothes sort of dry, but only a little. I went through all the troubleshooting suggestions in the manual--like emptying out the water thing and making sure the tubes were unobstructed---but still---we clothing! PLEASE HELP!

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Re: My LG WM3431H All-In-One Washer and Dryer won't dry

Alright - bumping an old thread but I think I have some helpful information to add. Firstly, here is a link to the service manual: .

Second, I must warn you that I am doing this from memory (even through it was this morning).

General note: Take note of what screw goes where. There are 5-6 variations.


1. Unplug the machine, unscrew the hot water, the colder water, and pull out the drain line from the wall (mine was just hanging into a waste water line, I assume some people have threaded connections).

2. Place the machine in a location that gives plenty of room to access the top as well as the back.

3. Remove the two screws which attach the top panel to the back. Slide the top panel towards the back of the machine, remove and place aside.

4. Remove the screws holding on the top cover/heat shield (this part should have a black tar like cover on top to protect from excessive heat). Lift the top cover and place aside.

5. Remove the screws holding on the back cover. Slide the back cover up slightly and pull the bottom of the cover out. This should free the bottom. Slide the panel downward to free the top. Place aside.

Take a look at the top of the machine, there is a large black duct that says something along the lines of "caution hot." Follow that heating duct towards the back of the machine to the circular cover (this is the fan). Now follow that downward to see the condenser duct (previously described as creamish white). This is part we are trying to detach from the rest of the machine and clean out.

In order to remove this duct from the machine we need to disconnect the heating duct/fan assembly, the small black sensor on the front of the condenser duct, the black tube connected to the condenser duct, and all of the screws holding on the duct itself.

6. Remove the screws holding the heating duct to the drum and the condenser duct. If I remember correctly, there are two at the front of the machine, three along the heating duct, and four by the condenser duct. Make sure you are removing the screws holding the entire duct to the drum/condenser and not the screws that split the duct itself.

7. Once the screws are all out, lift the heating duct/fan assembly slightly and tilt it away from the condenser duct. Place the heating duct/fan assembly on the machine with all of the remaining connections untouched.

8. On the top, front of the condenser tube there is a metal sensor attached to a rubber gromet. This needs to be removed from the condenser tube. It takes a bit of work, but it didn't seem like you could easily damage the gromet if you use a screw driver to pry it out.

9. Unattach the black tube at the top of the condenser tube by squeezing the metal clamp and pulling it away from the condenser tube. My washer had a bit of sealant/glue at the connection. I removed this with a set of pliers in order to disconnect the black tube.

10. Remove the screws holding the condenser tube to the drum. There is one on top and numerous on the back. There is one screw that is not accessible by a screw driver and requires a 5/16 socket and ratchet to remove (or some sort of angled screw driver...)

11. This should free the condenser tube. Remove it and clean out all of the lint. I used a coat hanger as well as the garden hose to get out all the lint. Also take this time to clean out any dirt you can access in the fan and the heating duct.

12. Follow these steps backwards to reattach everything, I hope you remember which screw goes where.

Its very likely I will not check back here, so good luck. I hope there arent too many mistakes in my write up!

Posted on Jun 26, 2011

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Re: My LG WM3431H All-In-One Washer and Dryer won't dry

Thanks to CoolTech for pointing me in the right direction, I just finished a full clean out and diagnostics test and my dryer works once again.

This repair isn't rocket science nor is it a good idea for the mechanically timid. I managed to get the critical parts out for cleaning and back in properly with just a phillips head screwdriver and a pair of pliers for the spring type hose clamps so it's not a matter of custom tools.

You have dig pretty deep and remove an awful lot of cabinet parts, fans, heater assemblies and something like 30 or 40 various screws to get to the condensor duct and bellows to clean them. Sure enough my condensor duct was jam packed with lint. Once removed I was able to clean it with a creatively bent coat hanger, but a semi flexible bottle brush/pipe cleaner about 18 inches long and an inch or so brush diameter would be a better tool.

If you want to tackle this job, and again it sounds daunting but isn't to someone with reasonable mechanical skills you should do yourself a favor and buy a copy of the factory service manual. I got mine on line from these guys: but there are probably other sources including LG if you search by the model number.

In addition to some less than obvious disassembly instructions the manual tells you how to trigger the self test mode and how to interpret the results, gives you good information on cold state resistance tests you can do on relays, heater elements, sensors, etc. and provides a good troubleshooting guide for a variety of problems.

All in all the job took me about an hour and a half and was pretty straightforward except for the last mounting screw for the condensor duct which is hard to get to and requires some effort to remove and replace but again I did the whole job with a standard medium sized screwdriver so it's not impossible.

Good luck and if you're having this problem and like me you don't have any local repair folks who'll touch it (not many of these all in ones in Wyoming) then I'd get your hands on the manual and dig into it. It's not fun, but not too hard either.


Posted on Jan 15, 2009

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Re: My LG WM3431H All-In-One Washer and Dryer won't dry

You may have a problem with a clogged condensing tube and condensing bellows filled with lint.  That will require disassembly of the unit to get to them and cleaned them out.

Posted on Apr 28, 2008

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Re: My LG WM3431H All-In-One Washer and Dryer won't dry

Hi and thanks. after the drain pump was replaced, the areas mentioned but it is still not drying fully -better but not correctly. looks the manual will be my next step and try the diag. on the relays, elements and sensors etc.
again thank you.

Posted on Jan 18, 2009

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Symptoms: Damp clothes. Steam present when the door was opened and the door was also wet.

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