Preventative maintenence inspection on high efficiency Carrier furnace running in great condition. Air filter in good condition. #35 humidifier pad in good condition. Clean flame sensor and check ignitor ohms. Visual inspection of burners. Flush condensation trap and drain lines. Humidifier controller is not working. Rewired and programmed thermostat for humidifier control. Test run operation of heating mode from thermostat. Temperature rise is within specs. Blower and inducer motors tested good. Pvc flue vents in good condition and no sign of leaks. 0PPM CO detected during testing. System is operating properly, efficiently and ready for Winter.