Responded to service call for intermittent furnace operation issue on a 10-year-old Goodman system. Diagnostic testing revealed flame sensor was severely fouled, causing flame sensing failures and resulting in the furnace tripping on flame sense code. Performed complete system tune-up including thorough cleaning of flame sensor, verification of proper condensate drainage, and inspection of heat exchanger (noted minor rust spots but no significant concerns). System was tested after service with proper operation confirmed, achieving 50° temperature rise. Discussed future AC installation options with homeowner.
