Hope someone can help... I have a nordyne gas furnace in a mobile home... model mmha-070aahr-05... serial mmh9606-00571... the t-stat is a hunter model 44110 7 day progamable... also have central air... when we moved in the old t-stat was broken so we replaced it with the hunter.worked fine last winter,this summer,the a/c worked well also... 2 days ago I switched to 'heat',put the fan in 'auto' and everything seemed normal,except it was blowing cool air... so I started the sequence over.after a couple of times,the blower motor quit coming on and the inducer motor continuously ran till it was too hot to touch.checked the flame.it was normal,nice and blue with a little orange occasionally.but,it would only stay lit for about 3-4 minutes,then shut down... I put a jumper wire on one of the (what I think is a limit switch)limit switches,the one that gets power from the 'on/fan' switch... now,the burner doesn't shut down,the blower motor runs but I'm still getting cool air.if I let it run an hour or so the temp comes up in the trailer,but only by a few degrees.when I did this test,it was 52 deg. Outside.temp in the trailer was 62 deg.I live in Michigan... and no,I don't leave the jumper hooked up for long,just to get the temp up a little bit... does anyone know where I can get a schematic/service manual on this furnace?I've already went to the nordyne site and requested one to no avail... thanks for any help,charlie