Completed a comprehensive furnace tune-up to ensure safe, efficient, and reliable operation for the home. Work performed included: System Inspection & Safety Checks • Inspected heat exchanger for cracks, corrosion, and proper flame pattern. • Verified operation of all safety controls, including high-limit switch, rollout switch, pressure switch, and flame sensor circuitry. • Checked venting system for proper draft, secure connections, and obstruction-free flue path. • Tested carbon monoxide levels at the supply, return, and flue to ensure safe operation. Burner & Combustion System • Cleaned burner assembly and verified proper ignition and flame stability. • Cleaned and tested flame sensor for accurate microamp readings. • Inspected igniter for wear, resistance, and proper operation. • Checked gas valve operation and confirmed proper inlet and manifold gas pressures. • Performed full combustion analysis and verified CO, O₂, excess air, and stack temperature are within manu