Preventative maintenence inspection on 2016 Carrier high efficiency furnace running in good condition. 20x25x1 air filter in good condition. Clean flame sensor and check ignitor. Visual inspection of burners. Flush condensation trap and drain lines. Humidifier damper is open, pad in good condition. Tested humidifier duringnheating test. Test ran furnace in heating mode from thermostat and zone panel. Temperature rise is within specs. Blower and inducer motors tested good. 3" pvc flue in good condition and no sign of leaks. 0PPM CO detected during testing. Furnace has staining on inside and outside, but components are clean and not damaged. System is operating properly, efficiently and ready for Winter.