Author Topic: LG W/D Combo leaves clothes wet  (Read 5449 times)

Offline Los

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Re: LG W/D Combo leaves clothes wet
« Reply #10 on: June 13, 2012, 10:19:58 PM »
replaced the blower motor assembly.  clothes still hot but wet during drying.  could the dry duct thermistor be the culprit?

Offline Los

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Re: LG W/D Combo leaves clothes wet
« Reply #11 on: June 13, 2012, 10:24:45 PM »
haven't sat and looked at it but if the machine isn't spinning enough water away - what should I start checking?

Offline clman

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Re: LG W/D Combo leaves clothes wet
« Reply #12 on: June 14, 2012, 12:13:42 AM »
Did you verify that the blower was or was not running in test mode prior to replacing it?

Are you getting the dhe code, either in or out of test mode?

The heater is controlled by a high limit cut out t-stat (thermal fuse), a high cycling t-stat and the low limit thermistor. The high cycle t-stat and thermistor tell the pcb if the heater needs to be on or off. To test the high cycle t-stat check for continuity at it's closed and open temperature ranges. You'll need to put it in an oven set for the open temperature. Take it out once the oven has reach the set point and check for a lack of continuity. Then as it cools off expect it to click and show continuity. It'll be hard to determine exactly what temperature it's cycling at but this will let you know it's working to some degree.

The spin speed can be determined in test mode. Refer to the test mode chart. Since it does not tell you what the rpm should be I have to guess. I've been doing it so long that I just listen to the pitch of the machine and can tell if it's off or not. Besides I've come to kinda distrust the info the pcb displays to me. I've seen it be incorrect to many times. All that being said, and based on another machines specs, I would expect to see the rpm read out at 125 - 155.

I have had to change the stator and rotor to solve a clothes too wet problem in wash only models before.

Offline Los

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Re: LG W/D Combo leaves clothes wet
« Reply #13 on: June 14, 2012, 02:35:43 PM »
blower was not running and triggered dhe error in test mode before new blower install.  as for the thermistor, your saying I have to check continuity while it is hot?

I seem to be getting good spin speeds in test mode >120rpm.

by the way thanks for your help, much appreciated!

Offline clman

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Re: LG W/D Combo leaves clothes wet
« Reply #14 on: June 14, 2012, 03:01:16 PM »
Just to be clear - did you see the blower not run, hear the blower not run or assume it wasn't because of the error code?

If the blower is not running in test mode and is new, either the new motor is bad, the m.pcb is defective or you have a wiring fault. The m.pcb ignores all imputs to run the blower in test mode.

Offline Los

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Re: LG W/D Combo leaves clothes wet
« Reply #15 on: June 14, 2012, 03:14:05 PM »
Heard blower not run in test mode immediately followed by dhe error code - this was all for the old blower, not the one I just put in.  New one works.
 

Offline clman

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Re: LG W/D Combo leaves clothes wet
« Reply #16 on: June 14, 2012, 03:21:43 PM »
So you are not getting the error code in test mode with the new one and it is not running?

Offline Los

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Re: LG W/D Combo leaves clothes wet
« Reply #17 on: June 14, 2012, 06:55:42 PM »
new one is running, no error.  however, checked main pcb and it has a red light on - which I believe means it is faulty.  This is the third motherboard, second in the past few weeks.  what could be making the pcb go bad?

Offline clman

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Re: LG W/D Combo leaves clothes wet
« Reply #18 on: June 15, 2012, 12:42:25 AM »
If you are talking about the red led on the inside of the m.pcb from I recall I've seen that lit on working units. I can't say for sure. Never paid much attention to it. I can find out though.

So the blower and heater are coming on during test mode and a cycle. And the clothes are still wet. And they are hot. The heat may not be being maintained throughout the entire dry cycle. You may have to babysit it through the dry cycle with a meter on the heater connectors or amp probe on one of the heater wires. You can also feel the duct to make sure it's hot. Naturally it's going to cycle on and of so it cycle from hot to warm. But it should not get cool. I don't know what the low limit temp is.

And just for the heck of it, while in the drying cycle, pull the drain hose out of the wall while it's drying to make sure it's draining occasionally. Also, for best proformance, the end drain hose should not be in standing water and should not rise more than about 12" above the machine.

Another thing is that there may be a restriction at the lower end of the exhaust duct. In the hose between the duct and the outer tub. The heater and blower heats up the clothes which evaporates the water in the them and carries that evaporate through the "condensing duct" letting it condense at in the exhaust duct through the bottom of the tub. Occasionally cold water is introduced into the tub to help cool the hot moist air that hits it. Thereby increasing condensation production. This last part I have surmised as it is the only thing that makes sense to me.

Offline Los

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Re: LG W/D Combo leaves clothes wet
« Reply #19 on: June 15, 2012, 01:01:06 PM »
Yes, machine still does most functions with a red light on pcb, but not all.  what could cause motherboards to go bad frequently?

 

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