What type of "digital CO alarm" are you using to take readings? Is this an actual instant-detection commercial meter? Or are you trying to use a homeowner safety alarm as a diagnostic tool?
Did you actually look at the heat exchanger?
You will not necessarily get an instant headache from CO like you do from diesel exhaust. The buildup could be much slower than that, even from a badly leaking exchanger. Also, gas is much cleaner burning than diesel, so there is no comparison between the two.
This is NOT an area where fixes should be conducted by amateurs. If TWO services said the exchanger is leaking, I would tend to believe it. At the very least, I'd want to watch while they were taking readings to verify there was acutally CO being put into the inside air by a leaking exchanger.
And then why did they say the exchanger cannot be replace?
I'm not against fixing what can be fixed, but messing with CO is messing with death. This is NOT an area where a guy wants to go against the professionals and be wrong.
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