First, be sure your CO detector has a good battery. Then consider. If the 'cap' has the furnace fire on one side and is cracked, it means the
remainder of the burner is suspect. Given the danger in a combustion leak I'd replace the furnace. They aren't that expensive.
--johnny
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Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell