Quote Originally Posted by MBsnow View Post
I second. If its producing CO then you will have to replace. You typically need a bore scope camera of some type in order to see any cracks, as the heat exchanger is not easily accessible. Thats why when guys say there is a crack without digging into the unit or seeing CO production on a meter, they are trying to sell you a furnace under false pretenses.

Stenz- I am curious. How old is your unit?
The tech showed me on his hand held camera/scope. The unit was built in 1997.