Have a rental a 4 plex I manage for a friend. Three units have a Williams wall furnace.
One apartment has been vacant, new tenant will be moving in on the first. About 1 1/2 months ago we had gas service turned on, the gas company verified that the unit started up correctly and it did, nice blue flame.
over the weekend I noticed the flame was burning yellow to orange. What does anyone think bad heat exchanger? I brought over my plug in co2 detector got a zero reading for PPM, not that it means much.
Just want to educate myself before calling a heating guy. Just for those that will ask the furnace is probably close to thirty years.