I have an Aprilaire 550 humidifier. The solenoid water supply valve makes a loud banging noice when openning or closing. And a message appears on my thermostat to call for service. What is the problem?
The solenoid is going bad and might start a leak later if not fixed or likely won't stop the water flow! Get it replaced!
SOURCE: What is the saddle valve?
Your humidifier will have either a copper or plastic tubing attached to it. This tubing is the water tubing. If you follow that line to where it "taps" into a water line (near the water heater or a water line under your house), there should be a water shut-off valve. The water shut-off valve could be any type of valve but is normally a saddle valve. You could skip the step of shutting off this valve; however, it is good practice to shut the valve off for two reasons: 1. in the event of a water leak, you will be able to easily locate the valve to shut off the water. 2. if the valve is not "excercised" from time to time, the seals will dry rot and the valve will not be capable of doing it's job when the need arises.
Here is a video showing you how to trace your water line to your saddle valve. There is additional information on the video that you might find helpful as well.
SOURCE: Bad Problem with solenoid valve.
I was getting a loud "clunk" when the solenoid turned on. By reducing the water input from a full stream to a trickle, pressure to the solenoid was reduced and the "clunk" became an a barely audible "tick" sound.
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