Honeywell Envirocaire Whole House humidifier not elevating humdity in home. Installed sev. years ago by HVAC contractor. Can't get the humid. above 30% no matter how high I turn it up. It is fed by hot water line, changed the pad, and the fan runs when the furnace fan is on. I leave the furnace fan on all the time, to no avail.

Try to disconnect the main power to the unit and if the water valve is still open and water is running, you have a bad valve (the valve stuck open). Tap on the valve body it may help on sticking it, if not replace it.

The humidity level setting may be set to low. 40% is right for most home environments. However, you made need to set yours at 50%.

Keeping the humidity level in your home below 50% will greatly decrease mold growth. You can pour some bleach in the drainage tubing to clean it out and do it every three months to keep it clean


http://www.ehow.com/how_4798220_clean-honeywell-humidifier.html

http://www.forwardthinking.honeywell.com/related_links/humidification/truesteam/sell/50_9718.pdf

Is the furnace fan set on auto or on. You will get better humidity if you keep the fan on. It won't add much to your electric bill because many of the newer furnaces operate the fan on DC voltage. Try it!

Humidifiers are made from a very durable heat resistant plastic. If it melted or warped you have a serious overheating problem. That plenum should not get over 140 to 155 degrees. If this furnace is running to hot it could stress and crack your heat exchanger. Install a good carbon monoxide detector in your home!!!! Check your filters. Check your airflow. Make sure all registers in the house are open. Is your blower speed set high enough? If this furnace is operating to hot it is definitely worth the investment to have a pro look at it before you replace the humidifier.
Is this overheating problem new? Or was this something thar happened years ago and may have since been solved But you are just now noticing the heat damege that was caused.
Goog luck
HVAC Teacher

Hi, Hot will make the problem worse. If your calcium is that high you will have scale in your tubs, sinks and toilets. Calcium is a pipe clogger and if you have noticed this type of scaling you may be wise to consider a whole house water filtration system, it will save you lots of problems in the long run. Good Luck!

have you checked the damper ? is the motor running the right direction ? have you increased the water supply to it ? you need to be sure that it is coming on only when you have a call for heat, normally your humidistat should be installed near the return, or on the return duct, for proper sensing, you could try holding a pan of steaming water, placing the stat above it, not to close, to see if the stat shuts off the hum, a little trick, that way you will know if the stat works ok, hope these helped, thanks for the question, mr.grzz

You should take out that aprilaire and throw it in the garbage or return it to who you got it from. Ask them why they didn't offer you the best humidifiers available. The only way to truly control humidity in your home without running your heat is a steam humidifier. Autoflo makes a good one also honeywell makes a new one. I have installed a honeywell tru steam in my own home and a few customers it hasn't lived up to its advertising. The auto flo has never given me any problems with customers.

Sounds like you Connected the humid trans fromer directly to a main power source. It should be either on the EAC or HUM term on the board of the furnace.

I have a similar problem with mine too. I am interested to see if anyone can diagnose this problem