LG dryer not heating

I’ve got a DLE2512W LG tromm dryer that is not drying. Cleaned the filter. It is blowing out the back but not getting hot. There are lights on the front that say clean the filter when you first turn it on…when you set it for normal the drying light and the cooling light come on. It this simply the heater that is bad or do I have a sensor or what that has gone south?