DLE7177WM - Seems to work ok, but it is taking

I would check your vent. It may be clogged somewhere. Cool light is normal.

Inside the dryer, near the lint filter, you will find two curved metal bars, about 1/4 inch wide each, about an inch apart and about 4 inches long. These sense the moisture in the clothes. When fabric softener sheets are used, a waxy substance will eventually coat the bars, so the dryer will not "see" that the clothes are still wet, and go right to a cool down. Clean them off, or use time dry only.

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

You may need to adjust the air flow on your dryer vent.
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.
*****************************************

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.

LG DRYER SERVICE MANUAL

LG PARTS


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

What I would do is check for air restrictions inside and out. Clean the dryer good and then check the thermister for proper tolerances using this service pamphlet

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

sound like heater or stat call them out.

I'll take a stab that you use dryer softener sheets. These will deposit a coating on the two metal sensor bars (about 4 inches long, very near the lint filter inside the drum) which prevents the sensor from "seeing" that the clothes are still wet, so the dryer jumps to the cool down portion of the cycle. Clean the metal bars off and it should work again. (note: the bars are not in the cycle if you choose time dry instead of using the automatic cycles)

Depending on the size of your loads, it could very well be that you have the dryer past it's "normal" capacity. This happens quite frequently around my house and the Mrs. will turn the dryer on two-three times on one load, but it's usually overloaded.

As per your question about the belt and it not spinning the drum fast enough, if the belt was slipping, you would smell the rubber burning as it slid over the drum.

As per the heating element, there is no such thing as it burning out. It is either working or IS burned out. there is no middle ground with electric elements.

Might I suggest you try making your loads smaller and see if you get different results. Always know that denim and heavy t-shirts, by default, are gonna take longer because they are more dense.

If, after going through these few steps, you are getting no new results, verify the blower is working properly by placing a few wash cloths, or other light pieces of clothing, and see how long it takes for those to dry.

Lastly, make sure you don't have your exhaust hose crimped or the outside vent is not completely stopped up(though I think you have already gone through these few steps) as this can cause a nasty fire and we don't want that.

Hope this helps.

Hi thanks for the question The easiest thing to check is the venting make sure the dryer is far enough from the wall so the vent wont kink check and see the air going outside is not restricted in any way . dirty vents can also cause fires especially in gas dryers thanks for the question the appliance doc

The vent is clogged.  To make sure, disconnect the vent from the dryer and run the dryer normally.  If your clothes dry normally, then have a professional vent cleaning company take care of the vent.  
The cooling light will always stay on during the run.  When it is blinking, the heat has stopped and is in the cooling process.
If there is no heating, you have a problem with the high limit switch or something else electrical and needs to be addressed by a qualified LG technician.