Share 'Extraordinarily High CO Reading on a Furnace Vent: 3950 PPM'
I just tested Fraser & Johnston natural draft furnace and got the highest CO reading that I've ever seen:
3950 PPM (air free).
Model # 80 RD 12-A.
Code date: 70 F3
What could could cause such a high reading?
Cracked heat exchanger?
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