Question about Aprilaire 400 Humidifier
Humidifier now does not work. The reset does not work. However there is now a constant red light illuminated on the circuit board within the humidistat housing.
Note - a cpmplete new HVAC system was recently installed.
The red light under the cover of the humidistat is fault light. This light typically indicates that there is an issue with your connection at the two wiring terminals labeled ODT on the humidistat. I would recommend checking to confirm that there is something currently connected to the two terminals. As a side note these two terminals can not be jumped out with a jumper, and must utilize either the outdoor temperature sensor (part 8052) or the manual mode resistor (part 4336).
Posted on Apr 23, 2010
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Posted on Jan 02, 2017
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Oct 24, 2017 | Aprilaire Humidifiers
If your humidifier is equipped with a Digital Humidifier Control with Water
Panel change indicator, after replacing the Water Panel, turn the control
knob to the "Test/Reset" position until the "Humidifier On" light blinks to
reset its timer. (Blower must be operating and HVAC calling for heat.) Be sure
to turn the control knob back to it's original setting. If the "Humidifier On"
light continues to blink, your humidifier is in Test mode. DO NOT LEAVE THE
CONTROL IN TEST MODE OR HUMIDIFIER WILL NOT OPERATE.
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