My dryer will run but will not get hot. The

First id make sure you have both phase of AC power coming into dryer.
Go to your house panel and reset yoru house breaker for the dryer. If in the USA the breaker should be a 240volt / 30amp breaker. It will have two breakers tied together at the trip switch.
If AC power is good at the dryer outlet then it could be one of the followings.

1. Open Thermal limit fuse or trip switch.
2. Open Heater Element.
3. Control board is faulty.