Question about Aprilaire 700 Humidifier

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Loud "Glonk" when humidifier turns off

Since its installation in December, my humidifier makes a loud "Glonk" when the furnace turns off. The noise is coming from the solenoid switch which does not sound as loud when standing next to the unit, but it seems to reverberate throughout the house. My contractor, who had been around a long time, went out of business shortly after the install with a new Trane furnace. I have a different contractor who installs Aprilaire products and who has been fixing lots of issues with the unit since its install, i.e. replaced fan motor, humidistat, and, in an attempt to stop the noise, a new solenoid. Now I'm being told that this noise is typical and I "need to get used to it".

Any ideas?

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  • PKslice Jan 20, 2009

    Yeah I have the same problem - clunk when the solenoid opens for the water to flow through the humdifier. Wuold not have bought one of these had I known. At least the old drum-foam unit was quiet. I have tried everything to get it to be quiet but no luck.

  • Anonymous Mar 24, 2014

    After the humidifier has been running, it starts to make a loud, continuous noise. Sometime it stops, but sometimes I have to hit it to make it stop

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Try turning the water valve going to the soleniod down. There may be too much pressure. You may have to replace solenoid one more time after making the adjustment.

Posted on Mar 13, 2008

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I had the same problem. Racingsmoke is correct. I too turned down the water pressure at the saddle valve & the clunking noise went away.

jweigt

Posted on Jan 25, 2010

  • ralph mouth
    ralph mouth Dec 12, 2013

    I measured voltade at solenoid and it was 24Vdc, yes dc....??? This in itself would cause a problem.

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