Hi everyone- I have a furnace mounted humidifier question. My unit doesn't have a name or model number on it, so I'm not sure who made it. There's a company name inside, probably of the seller and/or installer, but I can't find them. (See pictures attached - one is the inside of the unit and the other is the inside of the cover.) But it has a spray nozzle that goes inside the duct and a humidistat that attaches to the return. I noticed some water dripping from the furnace and discovered that there is water spraying from the nozzle even when the furnace is off. My assumption would be a solenoid that's stuck in the open position, but I'm confused by a couple of controls inside the humidifier. There are two knobs - one is labeled "Fan Off" and ranges from 80 to 120 (degrees I guess?) The other says "Diff" and ranges from 0 to 50. If I turn the "Fan Off" knob up to a higher number, the hissing of the spray stops. That tells me that the solenoid is capable of shutting off when it's told to and maybe my problem is with a setting on those knobs. So my questions: 1. Am I looking at this incorrectly and I really do have a bad solenoid? 2. If not, what do those control knobs do and how do I adjust them so I'm not spraying when the furnace is off? Thank you for any help and guidance.