A cracked heat exchanger ended this furnace's service life in South Lake Tahoe. The unit had stopped producing heat completely. Riley Plumbing Heating And Air found combustion gases leaking into the airstream through visible cracks in the exchanger metal. Heat exchangers fail from repeated thermal expansion over years of operation. Repairs aren't possible. Carbon monoxide contamination is the immediate concern. Replacement was the only safe option. The system age and the cost of a new exchanger made installing a complete furnace more practical than rebuilding the existing unit. Annual maintenance catches exchanger deterioration before cracks develop. This failure likely progressed over several seasons without inspection. Regular service identifies weaknesses early when interventions can still extend equipment life. If your heating system hasn't been professionally inspected recently, learn more about heating installation and maintenance programs that prevent emergency replacements during cold weather.
