How do I reset humidifier hours when I get a Warning Cylinder 1 Maintenance alarm on the unit?

How do I reset humidifier hours when I get a Warning Cylinder 1 Maintenance alarm on the unit?How do I reset humidifier hours when I get a Warning Cylinder 1 Maintenance alarm on the unit?How do I reset humidifier hours when I get a Warning Cylinder 1 Maintenance alarm on the unit?