Author Topic: LG washer/dryer combo (WM3988H*A) inefficient drying issue  (Read 746 times)

Offline flpirate

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Hi, all, I'm back again with my LG washer/dryer. It's still chugging along nicely except for the fact that it's not drying very well at the moment. No errors, so I'm not sure where we should be looking in the machine to troubleshoot. We took a look around inside the machine, and we did notice the drain hose had cracks in it, so we replaced it (with one from Home Depot). That improved the drying problem, but laundry still tends to come out damp and ends up needing two dry cycles.

Any ideas on where we should be checking for issues?

Thanks in advance for your help!

Offline VOGUSLAVKY

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #1 on: May 12, 2014, 01:06:54 PM »
is your vent clean?

Offline flpirate

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #2 on: May 12, 2014, 01:31:12 PM »
There is no vent, if you mean the kind that usually goes from the dryer to outside the house/building. Or is there another kind of vent I should be looking at? (Sorry for my potential cluelessness ... Feeling awfully brain-foggy today.)
« Last Edit: May 12, 2014, 01:31:51 PM by flpirate »

Offline VOGUSLAVKY

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #3 on: May 12, 2014, 02:24:38 PM »
Sounds like a bad Thermistor.

Offline flpirate

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #4 on: May 12, 2014, 03:07:37 PM »
We'll have to take a look at that. Thanks!

Offline flpirate

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #5 on: May 16, 2014, 03:57:01 PM »
All right, still working on this. While we had the machine open to look at the thermistor, we (re)checked all the drain hoses, the filter, and even the closest thing to a vent that we could see in the machine (it's labeled as part M310 in the service manual), and cleared out any accumulated lint, etc., just in case that fixed the problem.

We then tried a test wash and dry cycle, but when we checked the machine at a time that should have been part of the way through the full wash and dry cycle, the washer already had the "finished washing, press any button to open door" message. The tub had water in it, and the door wouldn't unlock.

We took off the front panel again, unlocked the door, drained the tub manually, checked the hoses for blockage, and tried running a speed wash cycle, without the dry cycle. The tub didn't spin, and the machine eventually gave a "check drain hoses and pump" message. So we rechecked the drain hoses and looked at the pump, drained it manually, and ran a speed wash without dry cycle again to check if it would drain properly ... which it did.

So we tried running another full wash cycle, with drying. The washing part of the cycle was going fine when we left the house to run some errands. When we came back, the machine had the "finished washing, press any button" message, but the tub had water in it again and again the door wouldn't unlock.

Does this still point to the dry thermistor being broken, or does it sound like there's a different issue now, or an additional issue?

Thanks for your help, as always!

Offline john63

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #6 on: May 16, 2014, 10:48:50 PM »
Replace the DRAIN MOTOR (4681EA2001T) and the COLD WATER VALVE ASSY (5221EA1009B) every 5 years.
Clean the DUCT ASSY as well.

Thermistors in LG washers---virtually ***never*** fail.

Drain Motors become *slow*---intermittently

Cold Water Valves have a special restrictor for the Duct (dry cycle use)

Both of these components get heavy use---due to operation during both the WASH cycle *and* the DRY cycle.

Offline flpirate

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #7 on: May 17, 2014, 01:11:46 PM »
Today's strange development: The tub is spinning. The washer appears to be draining. We put a small amount of damp laundry in on a dry cycle only, watched it work apparently properly for about half the cycle, walked away ... and when we came back, there was actually more water in the tub than when we walked away, and it looks like it's soapy.


Thoughts?

Offline flpirate

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #8 on: May 17, 2014, 01:12:49 PM »
Also, @john63, thanks for the tips. We've replaced the drain pump (is that the same thing as the drain motor?) within five years, and I think we just cleaned the duct assembly, but we haven't replaced the cold water valve assembly, so it's good to know we should do it soon. Thanks!

Offline domain

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Re: LG washer/dryer combo (WM3988H*A) inefficient drying issue
« Reply #9 on: May 18, 2014, 09:39:44 AM »
agreed with john. clean the rear duct assy when drying efficiency dissipates.

 

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