The automatic damper sticks open unless I close it with a rod I was wondering if the spring was bad?

humidifiers have a drain and if there is water going in it will be coming out the drain. check drain to see if it is clear, check hoses going into top of humidifier for cracks, check filter in humidifier.

Try to disconnect the main power to the unit and if the water valve is still open and water is running, you have a bad valve (the valve stuck open). Tap on the valve body it may help on sticking it, if not replace it.

Hello, sounds like either a low voltage wiring issue or the solenoid is bad. I would check the wiring and make sure it is all secure and tight, if the wiring checks out good replace the solenoid valve.

No. Open in the winter and closed in the summer

Try closing damper slightly between humidifier and furnace????

If the valve noise is excessive, or more than it was originally, then yes, replace the valve.

If the noise is no worse than it was originally, then you may be overly sensitive to the noise its making.

Also, check that the valve has not shifted slightly in such a way that it's opening and closing rattles it against something that it didn't used to rattle against. A sheet metal panel will amplify the valve opening and closing.

Let me know what you find.

trace thre copper tube backwards to where it connects to main water line if there is a valve there open and close it if your not sure whats open or closed try it both ways there is also a little restriction device either on inlet or outlet of solenoid that may be clogged

It is not likely to be caused by the selonoid valve. The selonoid is designed to be either open or closed, so if the unit is calling for humidity, it should be 100% open allowing as much water as possible to flow through. In cases of a bad selonoid, it will usually stick open or stick closed, but I have never heard of one allowing too much water through. Check to make sure your drain is clear and that the incoming line to the humidifier is positioned properly on the inside of the unit. If this doesn't solve the problem, it could be that the water line to the humidifier is too large, allowing more flow than the unit is designed for.

limit switch may be stuck open.open top door on furnace switch is round with little black hose on it. disconnect hose from furnace side and **** on it to see if it will close.reconnect hose and try furnace

Sounds like the air flow is too great and it is blowing the water in the bottom of the tray around before it gets a chance to drain. Try placing your summer, winter damper at half closed to slow the airflow down a little.