I went out to put a load in the dryer and when i push the knob it would not start

1. Turn off the power and then Unplug the dryer.Pull the knob off and pull the control knob straight up and off of the front of the push-to-start switch.Remove the back panel off the dryer.Remove the push-to-start switch.Install the new push-to-start switch.Reattach the back panel on the dryer.Reinstall the control knob.Restore power to the dryer.

The button might be broken or stuck or jammed and needs to be replaced.

For starters, a user manual for your dryer can be found here.

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

Has the Timer gone bad? check the connections to the dryer because the timers sometimes die, make sure to turn of the power and unplug the unit form the wall.

Hi,

There can be many reasons why your dryer will not start or turn...

The most common causes are the belt breaking or jumping off, or the motor goingbad...

Here are a couple of tips that I wrote will help you to figure out why yourdryer will not run...

Dryer Repair - The Dryer is not Turning

Dryer Repair - The dryer will not start


heatman101

Check the knob for cracks as well. Is it a GE?

My Hotpoint dryer is seven years old and did the exact same thing. When I got over the anger and the thought of spending 4 or 5 hundred dollars to replace it I started messing with it. I finally decided that since it buzzed when I tried to start it there was current there. The only other thing it could be was the drying cycle knob.
I held the start knob and let it buzz while I slowly turned the dryer cycle knob to the right. As I turned through each cycle it would hit "off" and the buzzing would stop and then resume as I moved past the "off " setting. On the third trip around the dryer "started" and has been working since. Maybe something got out of kilter. Apparently the problem was in the knob that controls the drying cycles.

check the door swich to be sure made up properly

This may be a thermal overload switch which is probably located underneath the top of the dryer. When you find it, bypass it to see if that is the problem. If so, replace it for about 10-12 dollars. Check the breakers first, then the connections in the back to see if they are secure.

is this the even heat model? if it is you need a new control board on the back of the timer area and might as well buy a couple relays the black ones with 4 wires in them. one is for the pts and the other is a heater relay both are the same part