BigRich
Member
I have a whole house Aprilaire 800 steam humidifier controlled by an Aprilaire model 62 humidity controller. It has worked fine for the past ten years but it doesn't seem to want to come on this year.
It cycles and works in test/reset mode when the dial/switch is turned to that setting but the digital number does not match the dial setting as I turn it when it is not in test mode.
In the past, I just turned the dial and paid little attention to what the digital display said so I don't know whether it should follow the dial setting but it sure seems like it should. Attached is a picture I took when I turned the dial to "7" (6 1/2). As you can see the display says "1".
After a reset the digital display seems to go higher. The last time I reset it I turned the knob slowly and the digital display reached “5” by the time the knob pointer got to “7”. Then it seems to degenerate to a lower reading. I never noticed before because you need to move the knob a little to get the digital display to switch from humidity % to the number.
Basically my questions are:
I have ordered a new controller and I won't be able to replace the one I have until next weekend. Is there a simple method to bypass this controller? I don't mean run it in manual mode, I would do that but the humidity measuring circuit thinks the humidity is just fine (actually a lot higher than it is even at the highest setting) and won't send a humidity demand to the humidifier.
If there is no relationship between the knob number and the digital reading, what do the digital numbers represent?
The manual doesn’t cover the digital readings at all (it refers to the dial/knob settings) and the unit is not functioning as it should. It has been down in the mid-teens outside and the humidity in the house is down to the mid to upper 20% range and the controller is not calling for the humidifier to come on.

It cycles and works in test/reset mode when the dial/switch is turned to that setting but the digital number does not match the dial setting as I turn it when it is not in test mode.
In the past, I just turned the dial and paid little attention to what the digital display said so I don't know whether it should follow the dial setting but it sure seems like it should. Attached is a picture I took when I turned the dial to "7" (6 1/2). As you can see the display says "1".
After a reset the digital display seems to go higher. The last time I reset it I turned the knob slowly and the digital display reached “5” by the time the knob pointer got to “7”. Then it seems to degenerate to a lower reading. I never noticed before because you need to move the knob a little to get the digital display to switch from humidity % to the number.
Basically my questions are:
I have ordered a new controller and I won't be able to replace the one I have until next weekend. Is there a simple method to bypass this controller? I don't mean run it in manual mode, I would do that but the humidity measuring circuit thinks the humidity is just fine (actually a lot higher than it is even at the highest setting) and won't send a humidity demand to the humidifier.
If there is no relationship between the knob number and the digital reading, what do the digital numbers represent?
The manual doesn’t cover the digital readings at all (it refers to the dial/knob settings) and the unit is not functioning as it should. It has been down in the mid-teens outside and the humidity in the house is down to the mid to upper 20% range and the controller is not calling for the humidifier to come on.
