My HM 3650 runs for approx. 15min then shuts down. Happen if on Auto, or not, and regardless of humidity set point. I was thinking about trying to bypass the humidity sensor. I was also unplugged the unit, let it sit and tried again.

From what you've described, it seems that the "A" setting may be a special or additional mode of operation. It could be an "Auto" or "Adaptive" setting that adjusts the fan speed based on the humidity level in the room, or it could be a specific function designed for a certain type of room. I recommend checking the owner's manual or contacting the manufacturer directly to find out more information about the specific function of the "A" setting on your Aircare (Valiant) Humidifier HD1409.

It depends on how humid it is in the conditioned space, how well sealed the conditioned room is, and how high you have the humidifier set. If you have low humidity in your conditioned space and you are asking for a higher humidity number, it could go through quite a bit of water. If your room is not sealed well, it will allow lower conditioned air into the room and put a larger demand on the humidifier

Here are a few things to check:

-make sure the heating element is clean. If there is a thick layer of scale (mineral deposit), then the unit will not turn on.
-there are magnets on the water reservoir that allow the unit to turn on. If these magnets are not lined up properly, then the unit thinks there is no tank, and thus, not turn on.
-turn the humidity up past your target point. The humidity near the unit could be a lot higher than the rest of the room, causing it to shut off prematurely.

Hope this helps!

The replacement solenoid may have been defective.

Hello
It depends on personal preferance,an air conditionner is going to remove humidity or water from the home,as water contains heat.

I would shut off the humidifier.The 40% setting depends on where in the world your located,say nevada is dry and hot so you may want a humidifier.Where florida is hot and humid so you would want to dehumidify or get rid of the humidity.

Lower the setting to 20% or just turn it off.

It sounds like it is not wired into the 24v fan controlon the furnace.

you may try running your blower 100% of the time.this should allow the humidifier to stay on even when your not heating. once the humidity level gets to where you want it, you may be able to put the fan selector back to auto. also you mentioned you have a variable blower. this is great if it is set up to run at approx. 20% fan speed when it is not heating or cooling. at 20% you can circulate enough air through the house to humidify without being able to hear the noise of the blower. it will really increase the comfort level of the house if you tend to have hot and cool spots. if it was not set up this way, contact the installer and ask if they can do this for you.

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

It doesn't sound like it has failed.

The whole point of the % setting is so that the room holds at that %. When the humidity drops lower than, it will kick in. When it raises to that number it will turn off.

If the on and off is bugging you try raising the percentage. Or lower the temperature of your house. Heating will dry out the air and cause your machine to kick in.

Good Luck.

I want do any thi9ng after I====push the power button once,
push timer once, I chose 50%hum. the icon (two tear drops)
stoped blinking. Nothing happen at this point as for as
humidity in tothe room. HELP