April Air Humidifier

probably. Meter the wires going to the solenoid. If they are dead then the solenoid is stuck. If they have 24VAC on them then the relay board is bad. Really not much else to them. (I'm ASSuming the 224 is similar to the 760 with which I'm familiar.)

nate

You could also try cleaning out the solenoid, but if it won't close with no voltage on it, it's probably bad or even if you free it up, it's likely to seize again. If it turns out the solenoid is bad, I have a working used one from a 760. Not sure if it's the same, but you can probably figure it out from AA website. If so and you're interested in it, email me and we can work out something.

Most common failure is the valve getting cruded up from minerals in the water. I havent had much luck with trying to clean one and tthey can be fairly expensive. The last time I replaced mine I installed an inline water filter like the ones you use on a refridgerator and havent had to change it since. Those saddle valves are also next to worthless. They are made for lazy plumbers.

Jimmie

I'd follow Nate's instruction,however it is also possible that whatever the unit uses to sense and regulate the water, for example a float switch or grounding probe, could also be at fault

Actually, no need for a meter. Just pull one of the wires (wire nut) off one side of the solenoid. If water still runs, replace the solenoid. Bubba