I notice that when I started my heater up today that it was "smoking" a bit more than usual. Didn't really think anything of it..until I came back later, and noticed all the vent slots on top were black with "soot"...I took the front panel off and noticed that all the flames are coming out pretty orange..which I know means that it isn't burning efficiently..they are normally almost all blue in color.
Is this lack of air intake, or ?????? what is going on?? I've had this heater up and running in the same location for years and never had this problem?
Any help troubleshooting would be great.
PS---here is a photo of the top of the heater