I'm looking for a manual. Our furnace was new in a 1982 Tamerack moble home. A couple nights ago, the fan didn't start when it started to heat up. The door just got hotter. Had to switch on the fan manually and let it keep blowing. Not sure what is wrong, but we need a manual to check it out and see if we can fix it, or we have to bring in a professional to fix it. Thanks, Larry