This customer contacted us with a no heat situation stating his furnace does not stay on long enough to maintain the desired temperature. Upon arrival, we took combustion readings and found CO over 2,000 ppm! We removed the intake and retook combustion readings and the CO dropped to 600 ppm. Our techs pulled the blower motor and found a bad secondary heat exchanger. The furnace was put back together and red-tagged, meaning the unit was shut down due to a critical safety problem. We then sent a home energy advisor to follow up with the customer and he ultimately chose to replace his furnace. We were there just a few days later to get him back up and running, just in time for the cold weather to hit!
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