2019 American standard gas furnace and aprilaire 600m humidifier. Found saddle valve closed not allowing water to pass into humidifier solenoid. Adjusted water flow for humidifier and tested unit. Set humidistat at 35%. Performed combustion analysis on furnace. Ppm co 8/11% o2/flue temp 94 degrees. Discussed with customer operation of humidifier. He mentioned he did. It close the saddle valve and was unaware it was there. Saddle valve is set where it needs to be and does not need to closed during off season. Only turn off humidistat and close bypass damper. All okay at this time.
