My Aprilaire Humidifier fails to feed water when the furnace is running..

Friday, December 9, 2011 by Aprilaire Team
Consumer question:

Unit was installed in February 2011. fails to feed water when the furnace is running.....even on the highest #7 setting. Worked fine last heating season

When the dial is moved to the "Test" setting, the water will flow and the 'reset light' will blink like it's supposed to....but when moved back regular run mode - even on # 5, #6 or #7 - it will not put water into the filter pan.


Aprilaires' response:

Thank you for contacting us regarding your 600A humidifier. Our controls have a built in design condition that allows the control to make a maximum of 45% relative humidity. If the digital screen has a value of 45% or above, the control will not turn on the humidifier outside of test. Also, the control has a accuracy differential of +/- 5%. So even if the screen reads 40%, due to this differential it may not turn the humidifier on.

Once the air in your home drops below 40-45% relative humidity your humidifier will turn on to add moisture to the air.

If you have any further questions regarding this or any of our products, please feel free to contact our customer service department at your earliest convenience.

Comments for My Aprilaire Humidifier fails to feed water when the furnace is running..

Monday, January 30, 2012 by T Smith:
I have same unit. Test setting works properly as described here. Digital display says 31%, setting on 7. With blower control on, humidifier operates (solenoid valve opens); with blower control off, humidifier solenoid closes. When furnace goes on, and blower control off, solenoid still doesn't open (humidity display still at 31%). Basically, humidifier operates only if blower control is on, never seems to work with blower control off.
Sunday, December 29, 2013 by Lori Warner:
I too have a 600A system and am unable to get the water to feed into the system when the dial is set at any level with the exception of the "test" setting. The digital screen read 17% humiditiy and our house is too dry. Please advise me on how to correct this issue.

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