Whirlpool dryer LER8648PWO won't heat

You may have a loose (disconnected) wire that is supposed to go to your sensor bars.

make sure door is closed and then if that doesnt do it, open door and look for where the door contacts at closing you will see a little metal table that is like a ground sometimes when a dryer door is closed or slammed the tab might get pulled backwards with the opening of the door again adjust the tab again so contact with door when shut makes contact if that doesnt do it, check your breaker and see if the breaker was tripped too

First check the heating element for short to frame. If it is not shorted remove the filter chute and clear it out. The control thermostat has 4 wires. 2 small wires come from the timer and power up a small heater inside the control thermostat making it shut down faster for perm press and knit cycles. Over time this bimetal inside the control stat won't shut down fast enough or not at all. If it won't shut down then the element will gl;ow reed and the base 250 stat on the heater chamber will shut down. If it fails to do so then the smaller one up top will trip at 300f. If it fails to trip or the filter chute is clogged the fuse skinny white plastic thing next to the control tstat will met and shut down operation.
Here is my HOME MOVIE ROPER DRYER NO HEAT
It shows the various components and how to check.

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heatman101

Since you say that the dryer runs but have no heat, plus the timer won't shut off the odds are the timer is bad. The timer would tell the burner when to be on and when to shut down.

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Stick a screw driver between the top and the body and pry up,the top should open up and you will be able to see the switch.

Your timer may be the cause of both problems. Not cycling and no heat.
Whirlpool makes a excellent dryer and is worth repairing. Replace the timer first. If you still have a heat problem most of the other parts are around $30.

It sounds like the belt is broken. Take a look a the video at this link and see if it helps you. Sure hope so and best wishes.

http://www.youtube.com/watch?v=9dd1Ac4_pXY

As long as the timer is on your heating element will be on.Sounds like you've have lost both.

A couple suggestions: (1) The switch in the front may be bad. It's the switch that turns the dryer off when you open the door. (2) Make sure the door latch keeps the door shut. If it is worn and the door isn't shut tight, the switch will not let it start. Hope this helps.