I am not knowledgeable about furnaces but would like to know what is wrong with mine. I have no idea what brand it is or how to tell. Flames come on then starts to blow then flames go off and blower continues to blow cold air until I turn it off at the thermostat. I can try to get any information you need if you just ask me. Thank you.
Debbie

Name ,model number would help,, its possible the flame sencer needs cleaned., locate remove and polish with fine sandpaper or steel wool

HVAC1000 will be along shortly to display a picture of what it looks like