Blower Fires Up But No Heat, just Cold Air
I have a Comfortmaker fan assisted combustion gas furnace model NTG3/FBF or NTN3/NBF with attached air conditioning unit in my garage that is about 7 years old. Currently, the blower fires up, but no heat comes out. I change the filter regularly and the air conditioning condenser outside is pretty clean. I set the digital thermostat to 75 with the fan on and it still blows cold, with the blower firing up over and over. I'm a single mom and would like to be able to fix it myself if it is a simple thing, like cleaning a part? any advice from all of you furnace gurus would be VERY MUCH appreciated.