Free second opinion on heat exchanger shows that there are no issues with the heat exchanger. Tests performed were visual inspection with borescope camera on inside and outside of heat exchanger. No visual issues. Followed by combustion analysis. Combustion analysis did not show any issues. CO AF reading 24ppm. Normal readings are less than 100, with anything under 400ppm acceptable. Used combustion analyzer to test for CO in the supply ductwork, and basement area surrounding the furnace. Both came back with 0PPM CO detected. Pictures of combustion uploaded to file. Furnace is combustion is within specifications and safe to operate.
