Check lint screen light on and dryer not turning on

From what you're describing, there could be a problem with the moisture sensor circuit. On the front of the lint screen holder(you have to stick your head in the dryer and look back, you will see 2 metal strips. These are the sensor bars. When wet clothes brush against them, it lets the computer know that the clothes still have moisture in them and about how much. As the moisture decreases, the electrical signal changes and the computer counts down. The time is JUST AN APPROXIMATION. However, if the sensor bars become shorted, or if there is a problem with the wiring of the sensor circuit, or if the main control board is defective, these will produce the problems you're having. One important thing to note: Samsung dryers, when using the sensor-dry settings, like to have large loads in order to work properly. And, try to have like items with like items(jeans with jeans, shirts with shirts, towels with towels, etc) If you have *small, mixed loads*, use the timed-dry settings for best results.
Also, check inside the lint screen holder with a flashlight(with the lint screen removed) for a large build-up of lint. If there is a significant amount of lint, you could have a partial blockage in the dryer vent tube or wall causing restricted airflow--this will cause longer drying times because the hot air, containing moisture, can't exit the dryer properly. THE RULE OF THUMB ON ALL DRYER VENT TUBES IS: **KEEP AS SHORT AS POSSIBLE, NO SHARP BENDS OR KINKS, STRETCHED OUT(if using the cheaper foil or plastic accordion type)**** Remember, gentle bend coming out the dryer, gentle bend going into the wall. The airflow coming out of the vent(outside the house) had better be close to what's coming out of the rear of the dryer, otherwise there is some type of restriction in the air path that must be removed.

Sounds to me like an air-flow problem. Poor air-flow means dryer gets hot and scorches clothes but there is nowhere for the wet air to go, so it doesn't dry well. Check for lint-clogged ducting from the back of the dryer to the outside (or at least check both ends of the duct). Also check for a collapsed or clogged flexible tube that goes from the dryer to the duct work.
An over-heated dryer could also have warped the (usually) plastic lint filter.

Instructions

1. Dryer Does Not Run
   • 1 Close the door firmly. The dryer will not operate if the door is not completely closed.
     
   • 2 Press the "Start" button firmly or push the knob in to start the dryer.
     
   • 3 Turn the dial past the "Off" position and away from "Wrinkle Prevent." The dryer will not start in the "Off" or "Wrinkle Prevent" position.
     
   Long Drying Times
   • 4 Remove the lint screen. Clean it and replace it.
     
   • 5 Check the temperature of the room. The dryer will not operate properly in temperatures below 45 degrees Fahrenheit.
     
   • 6 Inspect the area around the dryer. It requires at least 1-inch clearance on the front and sides of the dryer. A 5-inch clearance is needed on the back of the dryer. Move the dryer, if needed.
     
   • 7 Separate large loads and do not use an air dry cycle.
     
   Lint, Stains and Wrinkles
   • 8 Clean the lint screen before drying each load of clothes to prevent lint buildup on clothing.
     
   • 9 Add fabric softener sheets before starting a drying cycle. If the sheets are added after the load has partially dried, they can leave stains on the clothing.
     
   • 10 Dry small loads and remove clothing as soon as the drying cycle completes to prevent wrinkling.
     
   Dryer is Noisy
   • 11 Check the inside of the dryer for loose change, buttons or other items. Empty the pockets on clothing before drying.
     
   • 12 Separate items that are knotted together and restart the load. Knotted or balled up clothing will bounce and make the dryer vibrate.
     
   • 13 Level the dryer. Turn the leveling legs on the front of the dryer clockwise or counter-clockwise until the dryer is level. Turning the legs clockwise will lower the dryer. Turning the legs counter-clockwise will raise the dryer.
     

Instructions

Dryer Does Not Turn On
1

Ensure that the dryer's power supply cord is firmly plugged into an electrical outlet.
2

Inspect the structure's fuse box for a tripped fuse. Each fuse is assigned a single "On/Off" switch. If any fuse switch is in the "Off" position, flip that switch to the "On" position. If the problem persists, contact a professional electrician.

3

Press the "Start/Stop" button on the left side of the dryer's control panel.
4

Close the dryer door firmly so that the door clicks into place. The dryer will not operate if the door is not shut.
Lint Filter
5

Clean the lint filter. Twist the program selector knob on the control panel to the "Off" position, then open the dryer door. Pull the lint filter out of the dryer. The lint filter is located at the front of the dryer's tumbler, and is inserted vertically into the dryer. Gently stroke your hand over the filter to clear the lint, then reinsert the filter and close the door.
6

Turn the dryer off and allow at least 30 minutes for the dryer to cool, as excessive heat can cause a drying program malfunction.
7

Increase the ventilation of the room the dryer is located in, such as by opening a door or window. Excessive heat will cause the dryer to automatically turn off until it cools as a safety measure. Increasing the ventilation will help keep the dryer cool.
Clothing Not Fully Dry
8

Clean the moisture sensor. Open the dryer door to access the moisture sensor. The black-colored sensor consists of two bars, and is located at the front of the dryer's tumbler, to the left of the lint filter. The sensor should be cleaned with a clean cloth and white vinegar once per month.
9

Clean the lint filter. Twist the program selector knob on the control panel to the "Off" position, then open the dryer door. Pull out the lint filter. The lint filter is located at the front of the dryer's tumbler, and is inserted vertically into the dryer. Gently stroke your hand over the filter to clear the lint, then insert the filter back into the dryer and close the door.
10

Spin the laundry at a higher spin speed in the washing machine before placing the laundry into the dryer to reduce the moisture content.
11

Turn the dryer off and allow at least 30 minutes to pass for the dryer to cool, as excessive heat can cause a drying program malfunction.

The "Check lint screen" light is just a reminder to check the and clean the lint screen before or after each load. There is not a sensor that will detect if it's clean or dirty, it's just a reminder. The "Check lint screen" should turn off as soon as the dryer is started. If it never turns off then the control board would need to be replaced in order for the check lint screen reminder to turn off, however the check ling screen reminder light staying on will not effect the operation of the dryer.
Here is the control board to order.


The part comes with a 365 day, any part, any reason return.

then check the lent screen then

I am not familiar with your dryer, but it sounds like a safety mechanism where if your lint screen is not cleaned the dryer will not turn on. That "Check Lint Screen" light for your dryer may be connected to a sensor near the lint screen area. Check that out and see if that is the problem. If there is a sensor it could be faulty,

Try removing the lint filter from the dryer and with no clothes, start the the dryer, and if it works then replace your lint filter.
Tip: Fabric softener sheets in the dryer can deposit an invisible coating on the screen of the filter and reduce air flow.

Please tell me more as to what you have done to fix the problem.

Please check the following:

1. vent tube clear
2. lint trap/screen cleaned
3. thermostat control sensor operational
3. Flame overthrow sensor

Is your pilot light lit on your gas dryer? If it is, when turning on, does the burners fire up? If not, replace burner and control module.

If there is a dryness sensor, it will be just inside the door, on the bottom right. You can clean the sensor by rubbing the metal bars with a scrubbing pad. This will remove any wax buildup from fabric softeners.
Possible reasons your clothes may still come out wet:
1. The dryer isn't tumbling the clothes.
2. The dryer isn't heating.
3. The airflow is restricted.

From your description, the third seems most likely. If your machine is the one pictured above, inside the dryer door is a plastic grate over the lint screen. Remove the lint screen. Remove the two screws on this grate (Phillips.) Use a vacuum cleaner with a crevice tool to get out as much lint as possible. Be careful to not shove any lint or debris further down into the blower wheel.
Lint can also clog up in the vent pipe. This pipe should be cleaned or replaced anually. Also, check the exhaust vent on the side of the house.