With the thermostat set the pilot ignites the gas but since the fan doesn't come on it turns the gas off. When I touch the outside of the fan(Dayton, Model Number 6K030D, 1/3 HP, RPM 1725) it is warm to touch.. every once in a while, about every 5 minutes or so, the fan will try to come on, but then it just turns itself off. I'm not sure what to do next or what exactly is wrong with it.

Here are some pictures of the unit.