Humidifier is on manual mode and must be turned up to 7 for it to go on even though the RH in the house is 34% water panel is new.

Consumer question:

Humidifier is on manual mode and must be turned up to 7 for it to go on even though the RH in the house is 34% water panel is new.  This is 2nd year or operation.  Last year was working when set at 4 or 5.

Aprilaires’ response:

Thank you for contacting us with regards to your model 700 Humidifier. Based on the information you provided, we would expect that the humidistat will only operate when set to 6 or 7. In the manual mode, this humidistat  will target 45% RH at 7, 40% at 6, 35% at 5, and so on. Every number lower is 5% less humidity. If your furnace is running and the humidistat is calling for humidity to operate at 7, it should run until you reach 45%. We would also expect that if you turn the knob to a lower setting slowly, it should turn off around 5. Here is a copy of the owner’s manual for your humidifier. Please look it over at your convenience.
We appreciate the opportunity to be of assistance.

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