I had a 13 SEER Goodman furnace installed in my house last august. The AC and heatpump worked great up until about november, then I switched over to just running the wood furnace. Finally in December I needed to leave for the day, and decided to kick on the electric backup for the day. And of course, it didn't work. So, I gave the installer a call, and he came out and installed a new coil set and circuit board. I've used it twice in the last 2 months, and then went to use it again yesterday. And it didn't work again. Blower was blowing, but the house was getting colder and no warm air out of the vents. I've taken several electronics courses when I was in college, and plan on hitting it with the volt and ohm tester tonight to see if anything on the circuit board looks like it blew. Does anyone know if this is a common problem and what the fix may be? I'm hoping its just a blown fuse or relay or something.