Question about Honeywell HE225B Humidifier

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He 225 solenoid stuck on

HE225 humidifier - I will be on my 3rd solenoid soon. The brass seat (within the solenoid) keeps wearing away so the solenoid won't shut off properly after approx 8-12 months' use. - I have a water softener. - I have the water line hooked up to the cold feed into my water heater... but it may be getting some minimal warmth from there.. could this be causing the corrosion? I'm baffled... I need to find a solution to this while my next solenoid arrives - please help :)

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Posted on Jan 02, 2017

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SOURCE: Installing the Honeywell HE360A humidifier.

should be 2 wires going to humidifier you will connect wires from humidistat to them.

Posted on Oct 27, 2009

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SOURCE: I have a Honeywell House humidifier HE 225A-1006.

In order of probability:
1) (incorrect wiring) Make sure that humidistat is in SERIES wired with the furnace.
2) (shorted wires) Check that two wires to humidistat are not touching...use your glasses if you need them!
3) (bad humidistat) disconnect the humidistat and put an ohmmeter accoss the two terminals when it is turned on you should read 0 ohms, and when off it should read infinate ohms, if not pass both these tests, you need new humidistat.
That is it, there are no other possibilites!

Posted on Dec 26, 2009

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1 Answer

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Sounds like the solenoid valve on your humidifier is stuck in the open position. Shut off the water supply to it from the saddle valve on the cold water pipe as a temporary fix.

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How to connect the wires from the H8908A Humidistat and HE225 Humidifier to a carier model 58 STA090-14 furnace please? Thank you.


Not sure how much this will help you, but here is a link in pdf format to the Installation Manual, if you don't have one http://www.honeywellcentral.com/ssi/pdf/honeywell-commercial/HE220-Installation.pdf

If all else fails here is a number for Honeywell. Ask for Technical Support. (877) 841-2840

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Hello, the humidifier should only be running when the furnaces blower motor is running, therefore it should only drain when the humidifier is on and not flow continuously. Usually the humidifier will keep draining water when the solenoid is stuck open and should be replaced with a new solenoid valve.

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I have a carrier humidifier model BG49. When the furnace turns off due to reaching room temp. The water still continues to flow into the reservoir of the humidifier. Is this the correct operating...


Hello, The humidifier should turn on and off with the furnace's blower motor, If the humidifier keeps continously running than the solenoid valve is stuck open and should be replaced.

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Hi, We have a new house fitted with a Honeywell HE225 humidifier. It does not seem to work. Doesn't matter what we set it to, there is still way too much condensation on all the windows. We ended up...


Cut the power to the whole house humidifier and turn off the water pipe to it. If you want it running in the winter, put the water back on, but put a timer or a humidistat on the power cable to only allow it to run a certain amount of time per day, or to only run it the humidistat shows an RH lower than 45 percent (or whatever your comfort level is).

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If the solenoid goes bad, does its simply allow water to flow in at an uncontroled rate? When I turn mine on, water comes out of every seam


Hi yes the valve could be stuck in the open postion some thing on valve seating stopping it from closing ?

Nov 16, 2009 | Aprilaire 700 Humidifier

1 Answer

I have a Honeywell House humidifier HE 225A-1006.


In order of probability:
1) (incorrect wiring) Make sure that humidistat is in SERIES wired with the furnace.
2) (shorted wires) Check that two wires to humidistat are not touching...use your glasses if you need them!
3) (bad humidistat) disconnect the humidistat and put an ohmmeter accoss the two terminals when it is turned on you should read 0 ohms, and when off it should read infinate ohms, if not pass both these tests, you need new humidistat.
That is it, there are no other possibilites!

Oct 12, 2009 | Honeywell HE220A1019 Whole House...

1 Answer

Honeywell HE225 Humidifier will not draw water


Check for 24volts at the valve. Some techs install these so it only comes on when the furnace calls for heat. It should have its own transformer.

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2 Answers

No water going to humidifier


Easy fix: Check the solenoid. Turn off the power to your humidifier and the central air unit. On the side of your humidifier is a brass solenoid. It can get clogged with lime and calcium. Most videos and instruction manuals tell you to replace the solenoid. No need if you can turn a wrench.

1. After all power is off turn the water off to the humidifier and disconnect the top line water line at the nut.

2. Disconnect the bottom line water line that will go to your humidifier.

3. Take a Philips screw driver and remove the two screws that hold the solenoid on the side of the plastic housing of the humidifier.

4. Leave the wires connected unless you need more room to work. If you disconnect the wires then label them with tape (colored) so you put them back on correctly.

5. In the inlet or outlet water pip of the solenoid is a trainer that may be clogged. With a paper clip pull it out and clean it. If it’s clearly clogged then stop and put all back together. That may have been your problem.

6. If it’s not clogged then it may be clogged inside the solenoid.

7. The nut on the end of the solenoid is silver. Take it off and the magnet (main power unit) will slide off.

8. Notice the flat head screw post on the end of the solenoid. Turn it and remove. Be careful as a small spring loaded plunger is inside.

9. Take apart and clean all parts. You should be able to blow air in the intake water line tube and it go out the out water line tube as well as were the plunger hits in the center of the solenoid. If not then it’s clogged.

10. If clogged then just soak all but any parts with rubber or plastic in a small white vinegar solution for a couple of hours to eat away that lime. If it’s not clogged then you probably have a bad solenoid.

11. To check and see if the solenoid is bad just put it all back together but do not re-wire the solenoid to the humidifier.

12. Turn on everything without the wires going to the solenoid (turn on meaning put power back to the unit.

13. When the system is running as it should without the humidifier and solenoid wires attached check the two lead wires with a volt meter for 24v. If you have 24v then you have a bad solenoid and need a new one. If no 24v then you may need a new control panel.

Hope this helps you out.

Feb 21, 2008 | Aprilaire 400 Humidifier

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