Hi All... my neighbor's carbon monoxide alarm goes off, she shuts down her 1996 Carrier Weathermaker 58TUA hi-efficiency furnace, calls in Frank the HVAC guy, and after a peek inside (from the top), Frank concludes that the heat exchanger is cracked and a whole new furnace is needed.
Is this possible? Common? How can you tell if it's cracked (it looks like new haha)? What else might be the matter? Carrier had a 20yr warranty on those things back then... shouldn't a suggestion be made to use it? This was an expensive furnace... wt*?
Thanks for all of your help, :Dan