My furnace will not blow anything out, red light flashes @ where the theremostat wireing box on the furnace is. It says my attic fan is not working.

Yes you system has the Coleman makeup air system. I am going to post a sight for you to go to below. Sign in and post under Coleman. They can help since units of that type are usually in a mobile home.

Index page (http://www.mobilehomerepair.com/phpbb/index.php)