Not sure what your looking for exactly, but the furnace is controlled by the thermostat. Switch to heat for gas or electric if equipped.
There is a reset on the furnace which is that tin box with the ducts coming out of it. If it's not obvious you may need to feel around it to locate.
Other than that a fuse in the converter panel may be blown.
2014 375 BHFS Eagle Premier
2014 Ram 3500 Longhorn DRW CC
6.7 CTD, Aisin, 4.10's