Gas Boiler & Gas Hot Water Heater Carbon Monoxide Levels

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Old 03-25-18, 08:20 PM
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Gas Boiler & Gas Hot Water Heater Carbon Monoxide Levels

Hi all.

I just got a used Bacharach Combustion Analyser but also have a Testo 320.

I was doing some Flue gas testing and the Testo was at 1PPM maybe go to 2 PPM. The Bacharach went to 90+PPM on the boiler and 75+ on the hot water heater.

Both the Testo and Bacharach have new O2 sensors.

Also, the draft is -.04 to -.06 so I know I'm good there. The heat exchangers are very clean. I had cleaned out the boiler and burners, which were clean to begin with I pulled the hot water heater burner, and vacuumed. Looked very clean also.

No vent obstructions. So, I'm wondering if the Bacharach CO sensor is hosed.

Any suggestions?
 
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