The automatic control for my aprilaire model 600 is malfunctioning. To get it to work, I have to only move the knob slightly, but the next time the furnace kicks in, I will have to do this all over again. So basically, the unit is malfunctioning. What do I do?
Thank you for your email regarding your model 600 Aprilaire humidifier. The automatic humidifier control will operate your model 600 to achieve the set point the dial is set to. Once the set point is reached, the humidity level in your home has to fall below the set point before the humidifier control will again operate your humidifier. When you move the humidifier control dial to a higher setting, the humidifier will operate provided the furnace is running. This is normal operation. Based on the information you proved your automatic humidifier control is working as designed.