Whirlpool dryer stopped

Could be a defective door latch

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

Try pressing on the door to close it and
see if it starts. It sounds like the door switch has failed or the actuating arm is bent. You should hear a click as the door just barely opens or is nearly closed. No click = no start. I.e. Door switch problem.

There is a catch latch on your dryer door and that may be softening up when the dryer gets warm and the clothes tumbling against the door is enough to push the door out to the point that it thinks it is open. Try this exersize... The next time you wash clothes place a chair sideways against the doon with your clothes basket on it and see it it completes the cycle If it does then your door latch and actuating arm / post need replaced.

You are correct. Pull the dryer out and disconnect your venting from the back of the dryer. Turn your dryer on and check to make sure your dryer is blowing air out of the dryer duct. If it is then leave your dryer out at least 2 ft from the wall and run a load of clothes through the dryer. If it dries your clothes normally then you have a venting restriction. Check to make sure your venting is clean, not kinked or smashed, make sure your outside vent is opening an doesn.t have something blocking it. Check your lint screen filter by running water through it. If water is not flowing through it, you have a build up of fabric softener on your screen, blocking air flow. Scrub your screen off and test again. Good Luck, Appliance Specialists

Since your dryer is "new" it is under warranty. I will explain the possible reasons why it will not spin. Then you can decide whether to make the warranty call or not.

If your dryer doesn't tumble, check these:

Belt
Motor
Door switch
Belt Dryers have a drive belt that turns the clothes drum. If the belt breaks, the drum stops rotating. Then you need to replace the belt, and often the idler pulley, because the pulley tends to wear out at the same time.

Click here for a belt installation diagram.

Motor If the dryer motor only hums when you press the Start button, the motor may be burned out. Here's how to test the dryer motor:

• Remove the belt.
  
  
• Check for obstructions in the blower fan housing.
  
  
• Manually rotate the shaft of the motor.
  
  

If the motor is very stiff, or impossible to rotate manually, and the blower fan housing is clear, you need to replace the motor.

If the motor rotates freely, run the motor momentarily with the belt removed and the blower in place. If the motor runs fine with the belt removed, there may be a problem with the idler pulley or the clothes drum. Try to rotate the drum by hand. If it is very difficult to move, correct any problem with the rollers or pulley, and then reassemble the dryer and try it again.

If the motor hums but doesn't rotate on its own even with the belt removed--yet you can turn it freely by hand--you usually need to replace the motor or the motor start capacitor.

Door switch Your dryer can't operate at all if the door switch is defective. It's inside the dryer main housing near the door frame. Sometimes you need to raise or open the top or front of the dryer to reach the switch. If it's defective, you need to replace it.

Check the door switch. A little lever sticking down through top rightof door opening. If it is not there you will need new doorswitch(sometimes the little lever breaks off). If it is there and doesnot click when you press it in you need a new door switch. if it clicksand clicks when you close the door then you have a bad thermal fuse.The thermal fuse is found by taking the back of the dryer off. The fuseis an oblong white plastic piece with 2 wires attached.

Door switch part number 3406109
Thermal fuse part number 3392519

I presume she pushed the start button again. Can you hear the motor running? If so, it's a broken belt. The door switch can fail anytime. If the dryer started ok later, the motor was overheated. Lighter loads will avoid a lot of problems, and the dryer will probably work better.

If you have one of those fubuloso wrinkle guard whirlpools, they will buzz and start back up on their own in the cool down portion of the cycle the idea being the 2nd timer will keep the clothes from wrinkling by buzzing and then coming to life for a few minutes. Then it waits 10 minutes and if you aint got the clothes out or opened the door then it will repeat.

On some Kenmore which is made by whirlpool, there is a resistor connected to the timer control. when the machine is off can you listen to the timer switch and hear it running, making a clock ticking sound? If so, you need a new resistor. Being a dryer, when you open the door and it stops the button needs to be reset before it starts again, right? So I wouldnt be looking at the door switch as much as the start button. It may be the evil one.