Dryer will not dry close with normal drying cycle

Sears Parts Direct is one source of the parts diagrams, https://www.searspartsdirect.com/model/1vc37q1bdj-003204/lg-wm3987hw-washer-parts . See the Dispenser assembly parts diagram for the water inlet valve. If you can watch the entire cycle, try turning off the shut-off valves for the washer inlet hoses after the rinse cycle and before the dry cycle starts. Water should not flow into the washer/dryer with the shut-offs closed.

I've seen inlet valve solenoids fail in the open position or in the closed position. I've never seen a control board that sent open messages randomly. (Sometimes, there is damage to the control board or corrosion or damaged wiring that stops the control board from sending the open/closed message to the solenoid.)

I hope this helps.

Cindy Wells

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A fairly common problem! The official instructions are

Before using your dryer, wipe the dryer drum with a damp cloth to
remove dust from storing and shipping.
1. Load clothes loosely into the dryer and close the door. Do not
pack the dryer. Allow space for clothes to tumble freely.
2. Turn the Cycle Control knob to the recommended cycle for the type of load being dried. Use the Energy Preferred Automatic Setting (,) to dry most heavyweight and medium weight loads. See "Drying, Cycle, and Temperature Tips."
3. Select a temperature setting on models with a Temp/Fabric selector. The cycle descriptions include temperature setting suggestions.
4. Push the START button.

Stopping and Restarting
You can stop your dryer any time during a cycle.
To stop your dryer
Open the dryer door or turn the Cycle Control knob to OFE
NOTE: The Cycle Control knob should point to an Off area when
the dryer is not in use.
To restart your dryer
1. Close the door.
2. Select a new cycle and temperature (if desired).
3. Press START

Extracted from
http://www.manualslib.com/manual/511763/Whirlpool-Lte5243dq.html?page=10#manual

sounds like the timer is sticking in some cycles and works only in timed dry? as the points in other cycles are seized and stuck close? as for the bulb should be along the back wall of tub or near door

Hi dear.Here is some help from the user manual.I hope that helps.Thanks. DryingRack
To use the drying rack
Do not remove the lint screen.
1. Open dryer door.
2. Place drying rack inside dryer drum, positioning the back wire
on the ledge of the inner dryer back panel. Push down on
front edge of drying rack to secure over the lint screen.
3. Put the wet items on top of the rack. Leave space between
the items so air can reach all the surfaces.
NOTE: Do not allow items to hang over the edge of the rack.
4. Close the door.
5. Select a timed drying cycle and temperature, or an air cycle
(see following chart). Items containing foam, rubber, or plastic
must be dried on a clothesline or by using the Air Only
temperature setting.
6. You must select a time by pressing MORE TIME or LESS
TIME. Reset time as needed to complete drying. Refer to the
following table.
7. Press (and hold) HOLD TO START button (about 1 second).
NOTE: You must remove rack for normal tumbling. Do not use
automatic cycles with the drying rack.
This chart shows examples of items that can be rack dried and
the suggested cycle, temperature setting and drying time. Actual

Rack Dry Setting Temp. Time*
Wool Sweaters
Block to shape and lay flat onthe rack.TimedDryLow 60
Stuffed toys or pillows
Cotton or polyester fiber filledTimedDryLow 60
Stuffed toys or pillows
Foam rubber filled
N/A Air Only(noheat)90
Sneakers or canvas shoes N/A Air Only(noheat)90
drying time will depend on the amount of moisture items hold.

The burner is supposed to cycle on and off all through the drying cycle. Over time the operator coils 279834 get weak and quit. They are really easy to replace. This short video show a normal Burst of heat from a dry and the normal length of time it fires off

If you need further help, reach me via phone at https://www.6ya.com/expert/dan_73bbd84fe1d95b61

sounds like an air flow problem meaning the dryer is not exhausting the hot air. Best way to check is to disconnect exhaust tubing from dryer and run a cycle. If the clothes dry normally the vent to the outside is plugged. Hope this helps

try timed dry cycle instead of the auto-sensing setting. In your drum if you have auto dry such as less dry normal dry and more dry, There is a sensor sometimes in the drum and sometimes in the exhaust right after the blower. If in the drum then your clothes brush by this and if moisture is sensed then it keeps on drying. With your rack the clothes can't touch the sensor so it tells your dial to turn and that items are dry which in fact are not. Try this and see how it does.

This is caused by the dryer vent being blocked and not allowing the moist air to be removed from the dryer. To confirm this. Dry a load of close in a timed dry setting. Set the time on a specific time and then start the dryer. Wait for about 5 min. See if the timer has moved. If it has then the problem is not the timer. It is the exhaust vent being plugged up somewhere. Moisture how the auto dry setting works. The dryer sences moisture and runs longer to dry your clothes. With the dryer exhaust vent blocked, wet moist air is comming back into the dryer and fooling the sensor into believing the close are not dry and runs for a very long time. It is not uncommon for this problem to cause a dryer to never shut off. Your dryer exhaust vent is plugged up with lint somewhere.