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FIXED LG Washer WT4870CW - Drain pump is on even when washer is turned off

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LG puzzle

Premium Member
Joined
Aug 29, 2016
Messages
2
Location
Columbus, OH
Model Number
WT4870CW
Brand
LG
Age
1-5 years
Yesterday after the cycle was finished and the washer was emptied, the drain pump started to run. We turned off the washer and it kept running. When the unit was plugged back in the pump immediately started to run again, even with the washer turned off. I started a quick wash cycle to re-set the unit, however the drain pump was still on and pumped the water out as fast as it was being put into the drum.

LG support says that this is the first time they have heard of such an issue.

Can you please offer any thoughts on what to look within the unit?

Thanks for your time!!
 

LG puzzle

Premium Member
Joined
Aug 29, 2016
Messages
2
Location
Columbus, OH
I contacted LG twice, by phone and then chat, today and was told twice that the pump being on is some thing they have never heard about. I took the drain pipe off to look at the water being pumped out and it was clear and appeared not to be restricted.

I followed the wires up to the control panel and all seemed to be intact.

I wonder if it is the pump malfunctioning or if it has to do with main circuit board keeping the pump on?
 

jeff1

Appliance Tech - Moderator
Staff member
Joined
Oct 10, 2004
Messages
24,825
Location
Ontario, Canada
Hi,

I wonder if it is the pump malfunctioning or if it has to do with main circuit board keeping the pump on?

If the drain pump is getting power all of the time or when it shouldn't be getting power....can't think of anything else besides something stuck/welded closed on the board keeping the drain pump energized...

Main-Control-Board-EBR75795702-01676583.jpg Main power control board assembly

jeff.
 
Last edited:

JRBurke

Member
Joined
Sep 20, 2017
Messages
1
Location
FLORIDA
Did the main board fix it?

I'm having the exact same question with the exact same washer -- did replacing the main board fix this?
 

hmoffett

Member
Joined
Apr 24, 2018
Messages
1
Location
florida
Not sure why this worked, but traded out the drain pump and it was still running even with the new part. Put the old parts back in and was ready to buy a new washer. I had laundry to do, so I was going to "trick" my washer. I unplugged the pump from the washer circuit (with the washer unplugged of course), did a wash cycle until it was going to drain. Unplugged the washer, reconnected the drain pump, (it immediately turned on and started pumping out the wash water). I set the washer to rinse and spin out the clothes.

After the cycle, the pump turned off and it has been working correctly again for two days. A weird "reset" of the circuit board. Don't know how long it will last, but I have now done 8 loads of laundry and it is still working fine. Not a drain pump issue, definitely something with the circuit board. Needs a hard reset that the unplugging process does not fix. Like the guy 2 years ago, LG was puzzled. Has never heard of this issue before.
 

Dad#1

Member
Joined
Jun 22, 2019
Messages
1
Location
Indiana
My washer drain motor kept running even after the cycle was done. Was ready to buy a new circuit board. Watched a video on YouTube. The man talked about how he had the same problem but with a different model. The problem was a stuck relay. I unplugged the washer and opened the metal cover that covered the back of the circuit board. I plugged in the washer and unplugged it right away. After 5-10 seconds the relay clicked. I tapped on it with the handle of a screwdriver. Did this several times till I found the right one. It is now working!
 

jeff1

Appliance Tech - Moderator
Staff member
Joined
Oct 10, 2004
Messages
24,825
Location
Ontario, Canada
Glad you found it....it will likely come back...often the contacts inside the relay are pitted and get arced together = new board time.

jeff.
 

Saglianibobby

Member
Joined
Mar 1, 2020
Messages
1
Location
Gowanda, ny
My washer drain motor kept running even after the cycle was done. Was ready to buy a new circuit board. Watched a video on YouTube. The man talked about how he had the same problem but with a different model. The problem was a stuck relay. I unplugged the washer and opened the metal cover that covered the back of the circuit board. I plugged in the washer and unplugged it right away. After 5-10 seconds the relay clicked. I tapped on it with the handle of a screwdriver. Did this several times till I found the right one. It is now working!
Is the washer still working? I'm having the same issue now
 

GatorB877

Member
Joined
Jun 2, 2020
Messages
1
Location
Florida
Is the washer still working? I'm having the same issue now

I thought I would share my results for a simple fix of this issue. I am not very handy so anybody can do it. Someone above mentions tapping something with a screw driver fixed it. This actually worked. I did some research and there are two capacitors inside the control panel. You have to remove five screws to remove the control panel. I would also suggest unplugging the washer first. Once you remove the control panel and can see the circuit board you will see two large, black capacitors. Read up on capacitors if you would like but they hold electric current or charge even when the washer is unplugged. Tap on the top of those capacitors with a small amount of pressure (use your own judgement) as the capacitors are pretty durable to cancel the current in the capacitors. I hit them both about 7-8 times. I put the panel back on and plugged in the washer and it worked. The drain pump was no longer running. I don’t know how long this fix will last, but it was better for me than paying $150 for a new circuit board or $600 for a new washer.
 

MikeVV

Member
Joined
Oct 17, 2020
Messages
1
Location
St. Louis, MO
WONDERFUL!!! This worked...

Thank you, Saglianibobby and GatorB877, especially!

10 minutes from finding this page until our LG washer was fixed... five screws unscrewed... one metal back cover removed (which took the majority of the time, separating the metal back from the plastic tabs holding it in place... 8 taps on each black capacitor (reach about the size of a D battery, standing upright next to one another... and VIOLA! The pump was not running continuously and we now have a load of clothes being cleaned. What a blessed day!

Mike
 

Scpryor

Member
Joined
Dec 8, 2020
Messages
1
Location
Charlotte, NC
This fix worked for us!!! As we were taking the metal piece off the control panel my husband said “are we really putting our lives in the hands of an internet guy named Gator?”
We found the capacitors which do look like D batteries as mentioned above. On our unit they were dark brown not black. We gave them a few good smacks with our son’s plastic hammer then reconnected everything and it appears the issue has been fixed!
Thanks for your help everyone!
 

Morgue

Member
Joined
Dec 12, 2020
Messages
1
Location
Planet Earth
Hey Guys, I am an electrical engineer and wanted to tell you that tapping on a large high power capacitor is a dangerous thing to do. You can loosen the solder connections on the circuit board causing arcing or disconnect of the contacts. Also, you can damage the cathodes inside the cap.
The fix that your accomplishing is really a de-energizing of the pump circuit that is held in state by the capacitor your tapping on. The capacitor hold a charge for about 3-5 seconds after you unplug it, releasing the relay that is turning on the pump. Sometime, as the power regulation circuit wares out, the relay starts latching open and getting stuck there. As well, there are other electronic parts that make up that circuit that may be causing the latching relay. I fear that you will, at some point need to replace the main board for it to be a permeant fix. Full disclosure, I own one of these washers and found that this "unplugging the main board AFTER the AC was unplugged" did work (um without the violence) to reset the relay.

Cheers
 
G

Guest

Guest
My LG had a similar issue where the pump remains running even when the display shows the machine is off.

I was excited about the no-cost solution suggested here. Alas, no matter how many times I plugged/unplugged or lightly tapped the electronics, the problem persisted. BTW, I could hear the relay switching when the circuit was powered off.

So I ordered a new controller EBR75795702. That fixed my issue.
 
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