Main furnace not working.
I have a new to me 2011 Georgetown 378TS and when I attempt to run the front furnace, it makes noise but never does anything else, like put out heat. I'm guessing it's not igniting and the noise if some sort of fan or pump, but not the circulating fan. The aft furnace seems to work and starts up making noise and then starts putting out heat. It actually puts out heat up into the middle of the coach. Anyway, my questions are
Is this something I might be able to troubleshoot/fix?
How do I access this furnace if I attempt to do so?
There is a box under the refer that I don't know the function of, is that part of it?
Thanks for any insight.