Performed yearly maintenance and safety checks on 2020 bryant furnace. Cleaned flame sensor and water trap. Primed trap. 49 ohm igntion. Condensation pump operating properly.. Customer does not want humidifier coverage today Furnace running with 12.52%o2. 26 ppm co in flu. 0 ppm co in supply. 55degree delta t. Furnace properly cycled into second stage. Running with 9.16%o2. 16 ppm co in flu. 0ppm co in supply. 65 degree deltat. No issues at this time.