American Standard Freedom 90 VS furnace (city natural gas supply)
Furnace has a problem with all burners lighting. When call for heat is presented, ECM motor blows properly, igniter turns on & glows bright orange, gas control valve opens, and flame starts at...
I have a Lennox Whisper Heat forced hot air gas furnace. It uses a damper to close off the burner area when there is no call of heat. (Stop room air going up the flue).
Thermostat calls for heat
-damper door opens, IPI green lights come on
-Burner comes "On" in case the damper got stuck that the...