I have a Comfortmaker RPJ Heat Exchanger. It won't ignite. I tried the troubleshooting instructions on the unit and it won't work. I remember there was another switch that may have done the trick before but can't locate it. ANy suggestions?

My furnace will not ignite, it's a coleman evcon mobile home heating/cooling unit. Is there something that I can do myself to get it to ignite? Or what part might need replaced?

I have an Armstrong Natural Gas Furnace,and the orange hose that goes to a sensor doesn`t work sometimes, and the furnace blows cold air. If I blow in the hose, it will work the next time, but I can`t do this all winter. It gets cold in the middle of the night.

Hey guys, I've been looking through these forums but haven't found an exact answer to my question, so figured I'd start my own thread. I have an American Standard gas furnace that uses a glow plug-style ignition system to light the gas, but the furnace only blows cold air. Let's see if I can get...