Question about Aprilaire 700 Humidifier

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When furnance turns on and the blower kicks in the fan from the humidifier does not turn on ?

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The first to check is if you are getting 24 volts to the solenoid valve and if you are getting 120 volts to the humidifier via receptacle.

Posted on Dec 29, 2010

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Problem with 2 ....1 on each furnance Aprilaire 700 Humidifiers.. no fan no soilinoid click red light on one when furnance is runing they both worked last year


Odd for both to be out. Check the water supply sometimes corrosion or scale will block the saddle piercing valve. Run it all the way into the pipe. Usually need to spin the little valve handle clockwise. Then back it all the way back to full open and reset humidifier power and furnace power. After that may want to crack open water supply connection right before the solenoid at each humidifier to make sure water is getting to them.

Nov 30, 2013 | Aprilaire 700 Humidifier

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What's your problem?Wire connection for GeneralAire power hfumidifier #1137


You will need a current sensing relay to cradle the blower motors common wire to accomplish this.

Jan 08, 2013 | Humidifiers

1 Answer

Water constantly runs when furnace is on or off. I wired it exactly how the diagram said but the water never shuts off.


Hello, In order for the humidifier to turn on and off you need either a sail switch or current sensing relay. A sail switch senses air flow and will turn on the humidifier when the blower motor kicks on and a current sensing relay senses current through the blower motors common wire. If you have either of theses hooked up already and the solenoid valve remains open then the solenoid valve must be replaced.

Jan 24, 2011 | Honeywell HE220A1019 Whole House...

1 Answer

Is the humidifier supposed to turn on when the furnace does. Does it turn on more often when the temperature outside is higher.


Hello, Yes the humidifier should turn on when the blower motor on your furnace kicks on, this way you are only using water and power when the furnace is on instead of wasting it when when the furnace is off. Regardless of outside temperature the humidifier will only turn on and off with your furnace.

Jan 21, 2011 | Aprilaire 700 Humidifier

1 Answer

Water keeps running into humidifier even furnance blower is not


This sounds like, the 550 transformer is not connected to the blower motor power connection (in parallel)

Feb 19, 2009 | Aprilaire 550 Humidifier

1 Answer

Aprilaire 760 keeps running.


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.
Good luck
HVAC Teacher

Feb 06, 2009 | Aprilaire 700 Humidifier

1 Answer

Continous water flow on a 1042lh humidifer


theholts220 - Sounds like they needed to install a bit larger transformer . You can also buy a A 50 Sensing relay that attaches to the wires for your motor and when you turn on the furnace it will allow the power to go to the humidistat. Very strange though they do not use a lot of power. Check and make sure the wires are not pinched or touching metal somewhere.


TLuzzo - The humidistat seems to be working when you turn it down. The wires for the solenoid should be hooked up to your furnace circuit board. The instruction manual will tell you where. If you dont have a spot on your circut board the A 50 sensing reley is they way to go. They are inexpensive

Jan 24, 2009 | General Filters 1042-LH Humidifier

1 Answer

The fan or blowwer on my furnace is to loud. how do i fix this?


Hi!!! your fan blower has a capacitor right next to it change that first and test it.If sound is still there then your fan blower windings are getting bad..Good luck..but first change run capacitor .

Jan 05, 2009 | Honeywell Power Humidifier: Furnace...

1 Answer

Blower fan runs to long


ther might be dip swiches on the circuit board you might have to change

Dec 17, 2008 | Honeywell Power Humidifier: Furnace...

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