Question about Aprilaire 700 Humidifier

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FURNACE RUNNING LOUD

WHENEVER I TURN MY HEAT UP, MY FURNACE IS ALL OF A SUDDEN RUNNING LOUD. THE FLOOR IS SHAKING, THIS DID NOT HAPPEN LAST WINTER, HOWEVER THE BLOWER DID GO OUT LAST YEAR AND IT HAD TO BE REPLACED. THE FURNACE IS ONLY 2 YEARS OLD.

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  • David Beebe May 11, 2010

    is it fuel oil? Natural Gas or LP?

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Sounds like either the motor is off balance
or is going bad again
either way id be on the phone to the guy who did the rapair
more than likely the set screw on the sqiral cage came loose and now its vibrating

Posted on Oct 06, 2009

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I have a 1099 general powered humidifier making a loud humming noise.


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My aprilaire humidifier is 30 years old. Put in when the original furnace was installed. The water seems to be running through it and I have had the pad replaced, but I am still getting a lot static...


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Hi John Your whole question did not show up (maybe you can re-post) . I can answer what part i understand though. If the humidifier was wired in right it will not send power to the humidifier until the furnace is on, and calling for heat. This stops the unit from working in the cooling mode in summer.Make sure your furnace filter is clean as well

Hope that helps

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1 Answer

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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.
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We recently had the same problem. After cleaning both the furnace filter and the humidifier water panel, the clicking noise (electric air filter) and the loud bang went away.

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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)

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Nov 27, 2008 | Aprilaire 700 Humidifier

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