The previous owner had the furnace blower set on the med-high setting, but this could have been because the bearing was going out. I have no clue. I recently replaced the motor and wired it the same way as the old one. Tonight it's very cold out (-5F) and the furnace is having trouble keeping up. Currently 64F in here. Which I'm fine with if this is just an occasional thing... adding insulation is on this year's todo list. The air coming out of the vents has always been just lukewarm. I checked the LP pressure setting with a manometer last time I replaced the gas valve. What I'm mainly curious about though, is what about that blower speed setting? Should I change it back to low as recommended? I don't know if the PO added duct work for the 2nd floor himself or if that was there when the furnace was sized. If the fan speed is too high, what's the worst that would happen? I can't see running a cooler heat exchanger as being all that bad...? Would it cause increased propane consumption? Oh, and I should mention... the PO for some reason cracked off the intake PVC pipe mid-run in the basement and the furnace is currently sucking air from the basement. I don't know if it ever went outside or not but it certainly isn't now. I suppose I should fix that one of these days? Model GMNT060-3

[U]Model[/U] FG6RA 120C-20C [U]Issue[/U] HVAC pumps cool air around the house when it should be hot air = cant heat house to correct temperature. This has been happening for a few days [U]Events[/U] 1) turn heat on using thermostat 2) small fan starts on HVAC unit 3) hear click 4) hsi heats up really bright 5) a few seconds later burners ignite 6) hsi stops glowing 6) a few seconds later burners turn off 7) main fan starts without burners on blowing cold air around the house 8) The main fan keeps blowing, no smell 9) Then I can smell a small amount of gas from the burner area 10) Main fan blows for a bit making everything cold 11) Everything shuts off 12) Process starts again [U]Lights[/U] The red light stays on throughout the sequence (solid) The yellow light flashes when burners are on (low flame sensor?), once they cut off the yellow light stops flashing [U]Notes[/U] There are times when the heating works and pumps hot air but this seems to be less frequent. For instance, earlier today everything worked and the heat came up to the full 70 degrees. Any idea on what the problem is/what I need to do? Thank you!! [url=http://imgur.com/a/3f7C1]HVAC - Imgur[/url]