Question about Aprilaire 700 Humidifier

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Aprilaire 760 keeps running.

Last year my humidifier worked fine but when this winter season started I have found that my humidifier will not shut off. It used to only start a minute before the blower for the furnace started but now the fan on the blower runs constantly. If I turn the knob on the control it will stop running bu then when it restarts it will not shut off.

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  • bcamacho6497 May 11, 2010

    I will like to know what type of furnace you have and the type of humidity control and if possible how is wired

  • Mark Allen May 27, 2012

    How do I know if the solenoid valve is on?

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  • 189 Answers

The humidifier should not turn on untill the furnace blower starts. Since the fan stays on. does the solenoid valve also stay on? If they both stay on you probably have a bad humidistat. If only the blower stays on then the circuit bourd in the humidifier is defective.
Good luck
HVAC Teacher

Posted on Mar 09, 2009

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1 Answer

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