Question about Aprilaire Humidifiers

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Is Aprilaire 500M suppose to turn on when furnace motor turns on?

I had it wire to the 24V leads in the furnace cabinet but the only time the water valve turns on to the unit is when I do it manually with the setting dial. Also, what stops the water from running once the filter element gets saturated with water?

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  • Aprilaire Master
  • 1,033 Answers

The humidifier should turn on and off with the blower motor of the Furnace. This can be done by wiring the the humidifier to the HUM terminal on the furnace control board and then stepping down the power with a transformer. If the humidifier has it's own tarnsformer then a current sensing relay can be used by attaching it to the blower motors common wire.

Posted on Jan 14, 2013

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Posted on Jan 02, 2017

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SOURCE: My water never stops running into Aprilaire 112

Disconnect the two yellow wires. The water should stop. If it does you have a bad (or miswired) humidistat. If the water does not stop the solenoid valve is bad. These valves are known to be expensive. You might want to consider replacing the whole unit.
Good luck
HVAC Teacher

Posted on Mar 08, 2009

  • 2 Answers

SOURCE: aprilaire 600 humidier: water continuously runs

sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Posted on Jan 13, 2010

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If i hook my Aprilaire 400 Manual (not auto/digital) humidifier up straight to a 24v wall outlet instead of to the furnace, will it still work correctly? Or does it need to be powered by the furnace to...


Your humidifier is a bypass type. The only voltage needed is 24vac to open the water valve. Air only flows through the humidifier when the furnace blower is running, and the wet pad will add very little humidity if the furnace is not running and heating the air before flowing through the wet pad in the humidifier.
It is best the water valve is only energized when the furnace is running. Some furnaces have a connector on their control boards labeled HUM for this purpose. Test it's voltage when the furnace is running because some will output 110vac instead of 24vac you need.

Jan 31, 2013 | Aprilaire 400 Humidifier

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

Will the water only come on going thru the water solenoid only when it calls for water? Or is it suppose to come on at all times when furnace comes on?


The water should come thru the solenoid valve when the furnace's blower motor turns on, and turn off when the blower motor turns off.

Jan 04, 2011 | Aprilaire 600 Humidifier

1 Answer

Aprilaire 600 humidier: water continuously runs


sounds like you may have it wired to a continuous power source vs one that shuts off with the furnace. The most common wiring is red to C & white to W

Jan 08, 2010 | Aprilaire 600 Humidifier

1 Answer

No water flowing to water panel but have water to the solenoid. I have a Aprilaire model 550. wondering if the solenoid is bad and how do I check it.


To test solenoid, apply 24V directly to the terminals as see if water flows through it. Alternativly, turn everything on, ensure that there is 24 volts accross the solenoid wires, if you show 24Volts and no water, solenoid is bad. To test you will need to set your meter to AC Volts.
If you have a separate black transformer supplying the 24 volts, hook that directly to the solenoid. You may also be getting the 24Volts from your furnace circuit board, if that is the case you will see two terminals usually marked HUMIDIFIER on the furnace circuit board (you will need to open your furnace usually 4 screws or so.) There is 24 volts there WHEN THE HEAT IS ON , run two new wires from those terminals to the solinoid and see if it passes water cuz that is when those terminals have voltage. Best way is with a meter though and if you have 24 volts at the solenoid AND no water, it is bad. If NO VOLTS, then could be the the humidistat or a disconnected wire somewhere in the path.

Dec 26, 2009 | Aprilaire Humidifiers

1 Answer

Aprilaire 550 makes extremely loud grinding noise when turned on


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

1 Answer

Aprilaire 560 constantly drains water


check to see if you have 24 volts between to 2 yellow wires coming out of the water solenoid. if you have 24v, then it is still getting energized to run. if it does not have 24v and the water is still running, the solenoid is stuck open. most likely from water deposits. sometimes you can take the solenoid apart and clean it, but probably better off just getting a new solenoid.

Feb 07, 2009 | Aprilaire Humidifiers

1 Answer

Water runs when furnace is off, but stops when furnace is on.


the 760 humidifier does not need a transformer wired externally. the 760 has its' own 24v transformer inside the fan compartment. this transformer will provide the power to enrgize the water solenoid as needed. it sounds like to me the additional trasnformer is hot all the time. when the furnace comes on, the unit gets power and the internal transformer is cancelling the power from the external transformer. this would explain why it quits running when the heat is on. since the external transformer is hot all time, when the heat shuts off, the solenoid is getting energized by the external transformer. to make this run correctly, you need to get rid of the external transformer. leave the humidifier high voltage wires hooked up so they are only hot when the furnace runs. if you have a humidistat that has a r and c terminal, you will need to wire these directly to the r and c on the furnace control board and move the switch inside the humidistat to "power". make sure it is not on "bypass". then wire your 2 brown wires from the humidifier to each of the "h" terminals on the humidistat. if you have a humidistat that only has 2 terminals, wire one brown wire to each of the terminals. this should allow it to run properly.

Jan 28, 2009 | Aprilaire 700 Humidifier

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