GE Profile Harmony cycles normally. Heats initially. Then no more heat. Replaced the main board (because a technician said that was the problem). 
It is most likely the blower motor. If the exhaust blower motor does not come on, you will get the heat the first time, and basically that is it. GE has had problems with the dryer blower motor, especiallly on the gas models. The part # is WE17X10008. Tom