Guide :Humidifiers : 700 Humidifier
Humidifier control .
Aprilaire 700 humidifier properly wired to outside sensor, to humidifier solenoid/fan and furnace. Works properly in test mode for 1 minute as stated in instructions. Solenoid/fan, water flow does not come on in any setting. I notice when juggling wiring going to control that the water panel change indicator and the red diagnostic light flickers off and on. Wiring to all terminals firm. Could I have a bad Humidifier control unit?