Originally Posted by Chris
I had to jump a wire to the fan switch in the furnace so it would come on with the heat. I guess I could put a manual switch for fan only but I don't think I have ever run just the fan by itself before.
Didn't realize you jumper the fan to the heat, I thought you just stole the fan wire and left G open.
Won't your fan come on via control board relays in heat mode?
You'll be blowing cold air while the system is proofing the safetys (~1min), coming up to temp.
If your fan runs after burner shuts down then the control board is running the fan.
This is good to cool down the heat exchanger and get the most out of the warm ducts.