Question about Aprilaire 700 Humidifier

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AprilAire 760 not running after installing new circuit board

Unit worked fine last year. Not running this year. I had a service tech come to the house and he determined the circuit board was bad. I bought a new board and put it in but the unit still is not working. I check and have 24 v from the humidistat and the 120 v line is hot when the furnace fan is running.

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  • DennisC5A Dec 05, 2008

    installed new circuit board, fan still not running.

  • dkesler Jan 19, 2009

    A service tech unwired my Aprilaire 760 from the furnace when he diagnosed a bad solenoid. I ordered the part and replaced it and it works fine. However, I don't know how to rewire to the furnace to turn it on/off with the blower. My furnace has the 5 connection points Y W R G C. To which of these do I connect my 2 wires from the humidifier? Thanks.

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I called the service company that put in my new furnace (FAmily Heating and Cooling in Detroit, very highly recommend these people)

Anyway they sent out a second service tech who determined that I would be better off having the humidifier wired to go on whenever the furnace fan was running instead of using the humidifier signal from the circuit board on the furnace. After he changed the wiring the unit runs fine. It is pretty likely that the circuit board was bad also.


Posted on Dec 01, 2008

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Posted on Jan 02, 2017

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