Question about Aprilaire 700 Humidifier

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The water runs constantly, not just when the furnace turns on.

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  • Aprilaire Master
  • 1,033 Answers

Do you have a sail switch or current sensing relay with this humidifier? In order for the humidifer to turn on and off u need either a sail switch that senses airfllow in the return air duct and will turn off the humidifier when the blower motor stop or a current sensing relay that senses current on the blower motors common wire. I will post of pic of each one

Sail switch The water runs constantly, not - robhvac47_3.jpg


Current sensing relay robhvac47_4.jpg

Posted on Jan 03, 2011

Testimonial: "Thank you for the help. I have a current sensing relay. If it went bad, would it constantly send a signal to run the fan and water? thanks again"

  • Robert Jan 04, 2011

    Yes if it remains closed all the time for some reason than yes it can send voltage to the solenoid valve and fan on the humidifier.

  • Robert Jan 10, 2011

    If the current sensing relay checks out good then the solenoid valve is bad and needs to be replaced.

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1 Answer

The hot water in our Aprilaire 440 is running constantly through the filter and down into the sump pump. It continues to run even when the furnace is off.


The automatic shutoff switch from the furnace to the humidifier has probably gone bad and will need to be replaced. However If the humidifier has a float valve in it like a toilet tank, it may be hung in the open position,which allows the water to continually run. Take the top of the humidifier and check the float valve's operation. It may simply need cleaning.

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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.

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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

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I has the same problem with my HE360 unit. The unit was in fact miswired. The head unit red wires were connected directly to the blue solenoid wires, and activated the solenoid without any signal from the humidistat. As soon as the unit is plugged inn, the water starts running without any signal to the unit. If your unit is miswired, the soleniod blue wires need to be cut and connected to the red crimp connectors.

Mar 11, 2009 | Honeywell HE220A1019 Whole House...

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No water going to furnace humidifier


The furnace should be equipped with a #50 relay to turn the Humidifier on and off when only when the furnace blower is on. You should have a test mode on your humidistat. Do you have water coming up to the solenoid valve? Make sure that the saddle valve is turned on to supply the water to the humidifier. Is your humidistat set high enough to turn the humidifier on? Is it plugged in?
Good luch
HVAC Teacher

Mar 04, 2009 | AutoFlo 400BP Humidifier

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

1 Answer

Aprilaire 700 never shuts off


Thanks for your question,
Sounds to me like you have a bad solenoid valve in your Humidifier, this will need replaced, the solenoid is supposed to open and close when there is a call for humidity only when the furnace is running, then when the proper amount of humidity is sensed by the humidistat, then will it shut off, with the solenoid not working it will let water flow through like an open faucet, the solenoid is the componet that the 1/4in copper tubing connects to at the humidifier, has two wires running from it, you will need to shut the power off before changing this out, also shut the water off at the valve at the other end of the 1/4in copper line, or you might get soaked,please be careful when installing the new solenoid, making sure the water line connection is secure, or you will have leaks, hope this was helpful, please leave a rating, thanks again for your question,
mr.grzz

Jan 25, 2009 | Aprilaire 700 Humidifier

1 Answer

Honeywell 360a humidifier


yes water should turn off solinoid is bad

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