Question about Aprilaire 700 Humidifier

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New Aprilaire 700 - loud hi pitched whistle

I just had an Aprilaire 700 installed on my 90k hi eff furnace (new last year). I keep hearing a hi pitched whistle when the humidifier goes on. Trying to get the HVAC guy back - but he's busy installing and fixing furnaces - very cold this week.

Any ideas.

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You may be having problem with air scaping from the base of the hum. it will probably may have to put silicone around the base of the hum. to stop the air scaping.

Posted on Feb 09, 2009

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1 Answer

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Is this a newly installed unit it sounds as if there's a wiring issue. Could you show a picture of the wiring terminals. If this is not a new install try turning of your furnace fan.

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the float may be bad or sticking allowing water to run continusly even when unit is off.

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Before we replaced our furnace, I had to replace the transformer almost every year. When the new furnace was installed last year, the transformer disappeared. Now with winter coming on, the 550 hasn't


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A bad circuit board should not make any noises. A bad solenoid valve could make a loud buzzing noise. If the noise is a squealing noise then you have defective bearings in the blower motor.
If you disconnect the low voltage wiring from the solenoid valve and you still hear the noise, then its not the solenoid valve.

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Install new water panels yearly. On the new panel make sure that the painted dot on the edge of the panel is on the top when you install it.
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Feb 10, 2009 | Aprilaire 700 Humidifier

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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.


Nov 27, 2008 | Aprilaire 700 Humidifier

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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
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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.

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I have had the same problem , off and on, on my two 700 units for over 4 years. It is caused by water hammer which results when a water solenoid valve closes quickly under pressure. Refer to your owners manual or get a copy of it off the internet. Note the areas where they tell you to remove and clean the inline water strainer and the inline orifice restrictor. These are VERY small components and can clog up easily so they need to be cleaned per the manual. While cleaning them won't totally eliminate the problem it has helped mine with the noise. You really need to have a qualified person, like a plumber, install a small, water hammer arrestor in the inlet line. The trick is to be sure it ends up parallel to the water line flow and not perpendicular to it.... a common mistake. If you are not qualified to work on solenoids and piping, don't do it......it will end up costing you more to repair your mistakes. Good luck

Carl

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