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It may be clogged with mineral scale. Empty the water that you now have in the tank and refill it with a 50/50 solution of White Vinegar and Bottled Distilled Water. Let it soak for several hours and then turn the unit ON. If it starts working as it should. let it run another 5 minutes, turn it OF and empty the tank. Refill the tank with Bottled Distilled Water and allow it to run at least 45 minutes to flush the system. After that, if you do not detect any vinegar odor, you can continue to use the remaining Distilled water.
If the unit didn't work as it should have after several hours of soaking. Turn the unit OFF and let it soak overnight. If this solved the problem, I would recommend that you continue to use Bottled Distilled Water for normal operation, rather than tap water.
The automatic shutoff switch from the furnace to the humidifier has probably gone bad and will need to be replaced. However If the humidifier has a float valve in it like a toilet tank, it may be hung in the open position,which allows the water to continually run. Take the top of the humidifier and check the float valve's operation. It may simply need cleaning.
Water will flow over the filter pad as long as the unit is calling for humidity. once the unit is satisfied the solenoid valve should stop the water flow. if the water continues to flow with out call then solenoid valve has failed open. hope this helps.suppling an owners manual in case you need one.
http://www.aprilaire.com/themes/aa/en/manuals/AA-Humidifier-Owners.pdf
It can be one of two things first you either have air in your watter line in this case let water run for a while and see if you get air if so let it run until it quits spitting or contact your water company for help.Second the diaphram is worn in the top of the valve in this case the whole valve will need to be replaced turn off water flush toilet put pan or bowl under water line at toilet remove water line at toilet .Unscrew the fitting and remove hose next remove the large plastic nut on the bottom of tank .Some water will leak out hence the bowl! remove valve replace wit new one line up in same direction it was removed put on new rubber washer supplied,Tighten plastic nut replace hose and tighten turn on water that should fix it!
If the water continues runs nonstop even when the heater is turned off, you might have either a bad solenoid valve or a bad humidistat. Simply disconnect one of the two low voltage wires going into the unit. If the water turns off then your problem is most likely your humidistat or the low voltage wiring. If the water continues to run even when the low voltage is disconnected you have a defective solenoid valve.
Good luck.......
You need to determine whether the problem is in the solenoid or in the furnace electronics. You could put a voltmeter on the solenoid connection to see if the furnace is still holding the solenoid open after the blower stops. This will tell you whether it is the solenoid or not.
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