Question about Aprilaire 550 Humidifier

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Loud vibrating noise when the furnace blower starts up.

The Aprilaire Furnace Humidifier (550) water control panel rattles making a loud vibrating noise when the furnace blower goes on. When I turn the humidifier off, there is no rattling but also no humidity in the house.

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  • 118 Answers

Try closing damper slightly between humidifier and furnace????

Posted on Feb 04, 2010

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1 Answer

Have a aprilair 550 for some time. Installed a new Lennox G61MP furnace and the technitions failed to reconnect the wiring that powers the humidifier. Need wiring schematic. Does humidifier transformer get...


Hello, yes the transformer will get a 120 volts from the Furnaces control board, there should be a terminal labeled HUM on the control board. You need to bring 2 wires one from HUM and one from a nuetral tap on the board to the line side of the transformer, this way every time the blower motor on the Furnace turns on the humidifier will aswell.

Aug 23, 2011 | Aprilaire 550 Humidifier

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I have an Aprilaire 550 hooked up to my furnace,


in order for the humidifier to come on with the heater there has to be a temperature sense curuit to turn it on/off at a certain temp, the humidity curcuit on the unit will turn it off at set %

Jan 31, 2010 | Aprilaire 550 Humidifier

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My Aprilaire 560 doesn't shut off even if the blower is off.


My Aprilair 560 turns on and off repeatedly.Making a loud banging sound.Changed my water valve worked 1 day and started agin.

Dec 20, 2009 | Aprilaire 550 Humidifier

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yes it should be bypass but solenoid could be trying to open but the voltage to it may be to low if you have 24v ac power at the 2 small wires. but to change shut down power to furnace and water to humidifier.you loosen the 2 compression nuts unwire they cant be reversed so dont worry then 2 mounting screws then reverse to install

Dec 17, 2009 | Aprilaire 550 Humidifier

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How does it work with an outdoor wood burner that's run into the furnace


If you are using a hot water coil and the blower from the furnace. The humidifier should turn on with the blower from the furnace.

Dec 14, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 760 furnace humidifier makes a loud screeching sound.


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.

Apr 06, 2009 | Aprilaire 700 Humidifier

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Loud clicking, banging noise


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.

Nov 30, 2008 | Aprilaire 550 Humidifier

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FURNACE RUNNING LOUD


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

Nov 11, 2008 | Aprilaire 700 Humidifier

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Loud noise


Replace the water valve... It"s vibrating when closing. Do you have hot water feeding the unit?

Oct 22, 2008 | Aprilaire 550 Humidifier

2 Answers

Loud "Glonk" when humidifier turns off


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.

Mar 12, 2008 | Aprilaire 700 Humidifier

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