When the humidifier turns on,their is a vibrating noise and the vibration can be felt in the tubing from the hot water pipe to the selenoid.
I have a General Aire humidifier on my furnace. I was having the same issue with vibration noise. I took the solenoid off and took it apart. There is a part that had a screen and a very small hole. I cleaned all the parts in my ultrasonic cleaner. The I reassembled the solenoid. It had an electromagnet that was held on by one nut. I reinstalled the solenoid mechanism and started the system. I had way better water flow, but still some vibration. I tightened the nut holding the solenoid and electromagnet together and the vibration stopped.
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I removed the screen filter and that eliminated the vibration.ordered a new filter and will install it upon reciept.
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