I need a little help... back in July I purchased a mobile home and all was good until now.. since its getting nasty cold out it is getting cold inside the trailer.. I tried starting up the furnace and have no heat... now everything comes on all the blowers and all but the air remains cold.. I know a little but not a lot about furnaces.. its a colman evcon furnace and the model number is dgato75bdd and the serial number is 950846280.. it all seems to be electric.. I have had the thermo coupler tested and it tested good.. I turn the gas on to the furnace and after about 20 minutes or so I can smell the gas in the furnace but no heat.. it has a diagnostic board on it with a little green light which is supposed to flash when there is a problem somewhere with the furnace.. it does not flash at all it stays a steady green which according to the diag sheet means all is good... which in fact its not cause the kids remind me every morning that its cold.. lol... any help would be greatly appreactied..