I replaced the furnace filter, put the door back on etc and the furnace didn't kick in once I turned up the heat. The furnace worked just fine before? Is there a manual restart somewhere? I followed the directions turing the gas off and the furnace off and then back on etc, but that didn't work. I did this once before and had to pay a guy to come out and he manually restarted the furnace. I don't want to pay again. Any advice... I am sure its reall simple, I looked for the restart button but I cannot locate it, I think the furance guy said it was located in an obscure spot? I don't know?:D