mercredi 18 février 2015

Is small spike in CO when furnace turns on OK, or needing repair or replacement?

My city requires a furnace inspection before selling a home. Went with the least expensive ($50) inspection I could find, figuring it would be a rubber-stamped approval with us never having problems or CO alarms. (Perhaps a mistake to go cheap...) I have another furnace tech (a reputable and more expensive company) coming out to inspect, but it's going to be a few days. (Everyone is saying they're booked with people without heat.)



With the top door off, his detector found 73ppm when the furnace FIRST turned on at the FRONT of the burners. Over the next 10 seconds or so it dropped to 16ppm, and he stopped taking readings.



He found no CO in the plenum, even when the furnace was first turning on.



He's recommending that I replace the furnace for $1,400, and didn't pass it for inspection.



He also said he thinks the heat exchanger has a crack in it. He took it out and examined it, not being able to find any, but still saying there must be one causing a problem. (I see a lot of people saying this is a common scam. But the CO ppm is what I'm most concerned about.)





Is it normal for combustion to not be complete when turning on for the first few seconds? Is this a problem? Does the furnace need to be replaced? Am I being scammed?





I realize you can't say for sure, and it's really the second opinion I need. Just looking for whatever guidance you can give. Supposed to close in a few days, and trying to figure out likelihood of having to find a way to pay for a new furnace.

Is small spike in CO when furnace turns on OK, or needing repair or replacement?

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