So what’s the big deal with cracks or holes on your Heat Exchanger?
A cracked heat exchanger could allow exhaust gas from the furnace to contaminate the household air with carbon monoxide. In order for this to happen, the furnace must be producing high levels of carbon monoxide AND the exhaust gas must be mixing with the household air. For a good example of a hazardous heat exchanger, check out the photo below showing a large cracks in the heat exchanger of this high-efficiency furnace that was only ten years old.
This is a unit we performed routine maintenance yesterday. Heat exchange was replaced and tested fine