The dryer won't heat up?

Check the dryer dual breakers in your house electrical panel--push off, then on. Try the dryer again. If still no heat, measure the voltage at the dryer socket with a voltmeter across the two slanted slots. It should read ~220 volts AC if correct. If zero, one of the breakers is bad or there is a loose wire between the breaker and the dryer socket. If you read the required voltage, then the problem is within the dryer--likely the heating element. The drum must be removed to access the element.