whirlpool dryer doesnt heat

[LEFT]help my dryer was working fine it was just given to me and installed yesterday. On my second load of laundrey today the dryer stopped heating. what do i do first to check about the heat[/LEFT]

Here are your parts.
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=LER8857Eq2

First thing to check is the power.
The motor runs off of 120 volts but the heater requires the full 240.

Try flipping the breaker off/on slowly a couple times. Sometimes you can loose half the line without actually tripping the breaker.
Check the voltage at the plug
L1 to L2 should be 240 volts
L1 to Neutral and L2 to Neutral, both should be 120 volts.
If OK
Unplug the unit and check the wires at the terminal strip in the machine to make sure none are loose or burned out
If OK
Check the power at the terminal strip.
Do this with the heater off and on.
Be careful as 240 volts is lethal !!!