Electric LG Dryer tells me duct is clogged but it isn't


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Old 12-20-21, 03:15 PM
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Electric LG Dryer tells me duct is clogged but it isn't

I have an LG Electric Dryer, DLE3400W. Recently, it stopped working after a few load and gave me an "np" error which, from what I read, had to do with power issues. Well, it's been properly hooked up to its own double breaker for many years now and the plug and everything looked to be in great shape. If I let it sit a day I could usually get a load or two out of it before getting the error again.

Anyway, I bought and replaced the main circuit board panel and it worked for several loads, but is now giving me an n95 error which refers to a clogged duct. It's not clogged. Even before it replaced the circuit board, I replaced most of the line inside the house and cleaned out even the short run where it goes through the wall and outside and checked the vent cover, etc. I've even taken the dryer apart and checked other internal parts where the lint may collect and pass through. Nothing. I even wiped down the fan blades.

I've messed with this a while. There are two thin metal bars which make up part of the lint tray which are in turn plugged into wires. I assume this is the sensor. I've taken those bars out, washed them with soap water, dried and replace them. Still I get the error.

I sometimes get the error when just blowing the dryer out into the room with no vent tubing at all on the back. I ordered a new thermistor which will be in tomorrow so I'll try installing that. Can anyone else suggest what I might try? What sensor is falsely telling my drying the duct is clogged when it's clearly not?
 
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Old 12-21-21, 09:47 AM
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I'm not familiar with that dryer.

The two metal bars should be the moisture detect.
The clothes brush against them and create a short when damp or wet.

I don't see any specific part listed that would detect excessive lint so it must be a heat cycling issue. The dryer monitors one of the heat sensors for opening.

It should have a tech sheet inside by the control board that will list diagnostic steps to be taken.
I don't have that sheet and cannot locate it.
PUB MFL69290438
 
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Old 12-22-21, 09:28 AM
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Pjmax,

thanks for the reply,

The two metal bars should be the moisture detect.
The clothes brush against them and create a short when damp or wet.
So are you saying that these bars are what trigger the "flow sense" errors? Is this the same as the "heat cycle" issue or are we talking about different problems? These metal bars are literally just thin strips of metal. I can replace them for less than $15 bucks, but it's hard to know what could be wrong with them that cleaning and drying them wouldn't fix. I think these bars are what eventually lead to the thermistor, so replacing that might help. When I replace the thermistor, I'll see what I can find for instructions next to the control board, but the errors coming up are clearly about flow sense, otherwise known as clogs in the ducts.

 
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Old 12-22-21, 09:39 AM
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The "instructions" should be a single or two page mini service manual.
It may be folded up and in a plastic bag. It will contain diagnostics.

If the two metal strips are in a location where the clothes can brush over them... then they are moisture sensors. They have nothing to do with a clog or reduced flow. When you select an automatic cycle.... those strips tell the controller the moisture content of the clothes.
 
 

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