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Acidic condensate + CO test fails = cracked heat exchanger?
I had a HVAC tech tell me my boiler heat exchanger is cracked. He based this on performing a carbon monoxide test (over 10 ppm detected near the boiler hood) and evidence of acidic condensate (dust/soot/whatever) on the top of the boiler by the hood. He said that in his experience, the presence of these two things always means the heat exchanger is cracked. There is no evidence of water leaking.
Do you think his conclusion was reasonable?
FYI: The boiler is suffering from delayed ignition and flames shoot out the side when the boiler is started (this is why he was troubleshooting it). Two techs from two companies have said it's dangerous and one said he personally wouldn't feel comfortable turning it on again to troubleshoot it. So it's shutdown and I'm going to replace it. Now I'm just trying to find somebody that will do a good job.