Our LG dryer doesn't get completely hot until the clothes are mostly dry.

Either of these:
1. Air flow is blocked
2. Heating element is not working totally or not at all.
Check airflow for strong flow. If not. Unblock
check airflow for heating. If hot then heating element is working. If not hot, check heating element issue,ie, reset hi temp thermistor, check other thermistors, check heating element for continuity.
Report back what you find.

check one of the button are stuck first

From the document I see, it is only a matter of pressing the "Dry" button. This is from the manual, available at http://www.lg.com/us/appliances/washer-dryer-combos/LG-WM3431HW.jsp and selecting the "Support" tab. On the right, there will be a "Washer/Dryer Combos Manual" link, which will download to your computer. Listed under "Dry" in Section 9 is the following.
• Drying options are easily selected with the Dry button. • For most even drying , make sure all articles in the clothes load are similar in material and thickness. • Do not overload dryer by stuffing too many articles into drum. Items must be able to tumble freely • If you open door and remove load before dryer has finished its cycle, remember to press the Start/Pause button. • By pressing the Dry button, you can select "Normal" - "More" - "Time" - "Off" - "Low Temp" - "Less" • Your dryer can handle a load of up to 9 lbs. (4 kg) dry weight of articles. • When drying cycle is completed, [Cd] (Cool Down) is displayed on the Multi display. • Cool Down is set automatically when the drying cycle is complete. • If clothes are not removed promptly when the drying cycle ends, wrinkles can form. • The Cool Down feature periodically tumbles, rearranges and fluffs the load to avoid wrinkles for up to 4 hours. • The message [Cd] will continue to display until the clothes are removed or the Start/Pause button is pressed
Hope this solves your problem. I highly recommend downloading the users manual, it is a wealth of information and will prove useful in many circumstances.
Please rate and comment Thank You Joe

Hi,
The cycling or operating thermostatis often the problem when a dryer runstoo hot, but there are also other things that can make it run hot also.

Here is a tip that I wrote that gives more details about why a clothes dryer will get too hot.

Clothes Dryergetting too hot

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The valve resistance is 1995 ohms and the ignitor is 185.
*******************************************************************
Inspect the dryer venting from the rear of the dryer to the outside vent hood of the home.
If there's a restriction in the vent--the clothing in the dryer takes longer to dry.
When the dryer is functioning normally---the time required to dry laundry is determined by the *Sensor* located on the drum side of the lint filter housing and by the main control board.
When laundry is near dry--any Time Remaining on the control panel that is *not* needed will be eliminated---except for the last 6 minutes.
The final 6 minutes of any automatic cycle is for cooling down the laundry before the dryer ends the cycle.
If a dryer *counts down* to the last 6 minutes but the laundry is still not dry--the computer will allow the dryer to run until the laundry has dried or defaults (not drying within the additional time allowed).
Dryer vents that are longer than 8 feet with more than (2) 90 degree turns--can affect drying performance.
Setting the DRY LEVEL selector to *Very Dry* will solve most dryability issues. In homes with abnormally long vents--even the longer run time in the *Very Dry* setting is usually not sufficient to dry laundry loads.
Reducing the length of the vent or starting a second cycle becomes necessary to fully dry the clothing.
If a second cycle was started---only the amount of time that is needed to dry laundry will be used before dropping to 6 minutes and then the cycle will end with dry laundry.
*****************************************

LG gas dryers are more sensitive to venting length and air flow resistance. The gas burner can cause a rapid increase in temperature compared to an electric burner.
Rapid temperature rise in a gas dryer leads to premature burner shutdown (longer time required to dry laundry).
The gradual temperature increase of an electric element is more "forgiving" in homes where the dryer venting is less than ideal.
*******************************************

Problem:
The dryer has an auto dry feature which never fully dries the clothes so we wind up manually setting the dry time to an hour
Solution:
LG gas dryers are VERY temperamental in long vent set-ups. If fabric softener sheets are used in the dryer--clean the two stainless steel strips of metal on the lint filter housing with a SCOTCHBRITE PAD--scrub back & forth several times to remove the waxy residue from the fabric softener sheets. Most,if not all manufacturers do *not* recommend using sheets in dryers that have a moisture sensor (electrodes).
However--using a SCOTCHBRITE pad keeps the wax off those sensors which can be seen if looking *into* the dryer drum and at the lint filter housing.
If only *liquid* fabric softener is used in the washer--clean the dryer sensors once a month. Liquid softener also contains wax which can slowly accumulate on the dryer sensors from the laundry washed in the washer.
***************************************************************
Hold down on the 'More Time' and 'Less Time' buttons and press the 'Power' button. if it comes up with tE1 or tE2 you have a thermistor error.

LG DRYER MANUAL

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

then it maybe the heat element.Is it getting hot and it may be the controll panel,there still could be sme lint stock some were,try using vacum hose and put in back of dryer it may free it up.

Check your vent. Inspect the dryer venting from the rear of the dryer to the outside vent hood of the home.
If there's a restriction in the vent--the clothing in the dryer takes longer to dry.
When an LG dryer is functioning normally---the time required to dry laundry is determined by the *Sensor* located on the drum side of the lint filter housing and by the main control board.
When laundry is near dry--any Time Remaining on the control panel that is *not* needed will be eliminated---except for the last 6 minutes.
The final 6 minutes of any LG automatic cycle is for cooling down the laundry before the dryer ends the cycle.
If a dryer *counts down* to the last 6 minutes but the laundry is still not dry--the computer will allow the dryer to run until the laundry has dried or defaults (not drying within the additional time allowed).
Dryer vents that are longer than 8 feet with more than (2) 90 degree turns--can affect drying performance.
Setting the DRY LEVEL selector to *Very Dry* will solve most dryability issues. In homes with abnormally long vents--even the longer run time in the *Very Dry* setting is usually not sufficient to dry laundry loads.
Reducing the length of the vent or starting a second cycle becomes necessary to fully dry the clothing.
If a second cycle was started---only the amount of time that is needed to dry laundry will be used before dropping to 6 minutes and then the cycle will end with dry laundry. Bonus:
LG DRYER

Problem:
The dryer has an auto dry feature which never fully dries the clothes so we wind up manually setting the dry time to an hour.
Solution:
LG gas dryers are VERY temperamental in long vent set-ups. If fabric softener sheets are used in the dryer--clean the two stainless steel strips of metal on the lint filter housing with a SCOTCHBRITE PAD--scrub back & forth several times to remove the waxy residue from the fabric softener sheets. Most,if not all manufacturers do *not* recommend using sheets in dryers that have a moisture sensor (electrodes).
However--using a SCOTCHBRITE pad keeps the wax off those sensors which can be seen if looking *into* the dryer drum and at the lint filter housing.
If only *liquid* fabric softener is used in the washer--clean the dryer sensors once a month. Liquid softener also contains wax which can slowly accumulate on the dryer sensors from the laundry washed in the washer.


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

I found your manual and learned yours is a GAS dryer... the FIRST check is to be SURE the gas valve to your dryer is OPEN.

There is a Troubleshooting section, but NOTHING about no heat?

Know that LOW gas pressure CAN be a issue too!

I did find this:

"If the dryer no longer heats then the heating element may have failed, but it is not the most common cause. The most common cause for a dryer to stop heating is a blown thermal fuse."

The SECOND Link will be VERY helpful...

More help?
Cause 1 Thermal Fuse
Cause 2 Gas Valve Solenoid
Cause 3 Igniter

LG DLE2101W Support Manuals Warranty More LG

LG Dryer Not Heating

Thermostat

IGNITER

You're a moron. This unit washes and dries. That's the whole point of it. Perhaps you should do some research before answering the question. the most likely cause is the water lever sensor.