The moisture sensor is in the lint filter. Remove 4 screws from inside the drum and you have the sensor attached by 2 wires. On my dryer I disconnected then reconnected these 2 wires, reassembled the lint trap and auto dry works fine again
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Timer motor is shot. Remove a wire from it and check continuity. If the timer does advance in timed dry i suggest you yank out the dryness board and clean the contacts. The dryness board is a small board with a capacitor mounted on it. The capacitor is connected to the drying sensor bars inside. As the wet clothes rub the sensor bars the capacitor gets discharged. When the capacitor gets fully charged (because the clothes are dry) then the timer motor gets power. If the contacts on the board are corroded the motor won't advance. If it advanced and shut down after only a few minutes that is dirty sensor bars (no moisture being sensed). MORE
Ain't no moisture sensor. This is is not an electronic sensing machine. It uses another method to determine dryness. An orange wire connects to the base of the heating element. The timer motor is driven by power from it in auto dry. The timer motor is VERY slow. Slower than most dryer timer motors.As the clothes get dryer the heat is not needed so the element is turned off by the control thermostat which is mounted next to the skinny white fuse on the blower housing. This allows for the turtle like motor on the timer to advance. Once the clothes get to the point of dryness the heater stays off way longer and the timer motor advances on over to the cool down and carry on over to the end of cycle. So the clothes won't always be dry due to factors like lint buildup in the blower housing, venting to outside and so forth. having said that my mom bought a brand new Kenmore dryer and I set it on 55 minutes timed drying. At the end of that them clothes is still damp. I then set it to auto dry high heat and that usually gets em dry. I think the main probo with this dryer is the thermostat ain't set as high as older models to keep the heat at a moderate temp so that the limits won't blow on models in apts and such. Just a theory.
First, I always set the dryness level at the maximum dry level, because the Korean's "Normal Dry" is what we call "Damp Dry". The sensor is located just inside the door, by the lint filter. If you stick your head into the dryer drum and look back toward the filter you will see it. (two curved metal bars, about an inch apart and about 5 inches long.) Clean with soap and water, or I've heard rubbing alcohol works. If your sensor bars need cleaning, the dryer usually will go quickly to the 6 minute mark after starting.
We have been having this same problem. I had tried adjusting everything that I could think of when putting a load of laundry in and got the exact same results as you. I would select the sensor dry and it would count down just like normal until it got to 6 minutes and then it would just run forever at 6 minutes.
My husband and I searched online all this afternoon and came across what seemed way to simple to work. We removed the lint filter, unscrewed the filter housing right inside the door of the dryer, and got to the sensors. We took a damp cloth and wiped them off very well to remove any and all buildup. We wiped everything down very well to remove any built up lint and/or dirt and put everything back in place as was before. We then unplugged the dryer for about a minute and then plugged back in. We put a load of already dry clothes into the dryer and started as usual with the sensor dry. It started out at the usual 41 minutes then skipped down almost immediately to 6 minutes and then a few minutes later I heard the most beautiful sound I have heard in a long time. The Beeper signalling that the timer had counted down to the end and was finished. It had worked. Thankfully. Hope this helps you also.
I called LG...they said to unplug the dryer for 5 min. to reset the timer ...this solved the problem.
They also said not to use dryer sheets during the sensor dry cycle as the coating on the dryer sheets causes the sensor to malfunction as it can't read the humidity level in the dryer.
call svc tech under warrenty, also sensor rellies on clothes touching two shiny strips to sense the dryness of the clothes ussaly in front or rear of drier drum or rather back or front wall inside wet clothes short the bars and stalls timer when they are dry does not short bars so sensor knows dryness by resistance of short tilt drier front or back where ever bars are to make shure clothes main tain contact lots of time this cures the promblem