Performed comprehensive HVAC tune-up on 5-year-old furnace reported to have previously failed a combustion safety test. Inspection revealed extremely corroded and rusty burners contributing to high CO readings. Thoroughly examined heat exchanger (showing some rust but no cracks or holes), verified normal gas pressure, and confirmed proper operation of inducer and blower motors. Cleaned condensation trap and inspected flue pipe with no issues found. Replaced deteriorated burners to resolve the combustion safety concern and ensure proper system operation for the heating season.
