Verify that the humidifier's water supply is open, and that its distribution media is indeed wet. Some humidifiers have rotating drums with water pans that fill from a float valve, others may use a solenoid valve to control water flow over a media pad. Some even have misting nozzles. Advice on setting the humidistat based on avoiding condensation on your windows is correct; keep it as high as passible and keep backing it down as dictated by your windows.
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"The trouble with people idiot-proofing things, is the resulting evolution of the idiot." Me
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