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Back in the fall of 2010 I had my local HVAC guys install an Aprilaire 600M humidifier on my Lennox G60 two stage furnace. It worked great until the beginning of this heating season when I noticed that the air was getting dryer and dryer each day. (I use a calibrated Taylor hygrometer to monitor the humidity). I then checked and found that the humidifier wasn't turning on. Called the HVAC guys back and they found that the humidistat control panel was bad and replaced it. Before this problem came up, I used to keep the humidistat at about 35, which would result in an indoor humidity of between 45-50, which is very comfortable. After the new control panel was put in, the humidifier works but unless there's cooking on the stove or people showering the humidity doesn't seem to be able to go above 45, even though I almost have the control maxed out. Is there an adjustment (other than the dial) that controls the sensitivity of the control panel? If not, I'll probably have to have them come back and replace this one. I may have problems with a warranty claim though, cause it still technically works. Thoughts?
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