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That unit is specialized and proprietary and you will not find any information to service it yourself. Since it is licensed and considered medically regulated, you must return it to the manufacturer for repair
Perhaps your machine stops when it has reached the desired humidity level you selected. It doesn't have to be empty when it reaches that selected level. My mother thought the same thing but was so relieved to find out it was working properly all the time.
If it has a humidistat in the power cord it may have gotten wet when refilling. Blow the water out, or remove the screw to open the small casing and dry it out. If it was wet, the unit should start running normally.
Hello, check to see if you are getting 24 volts to the solenoid valve, if you are and the solenoid does to click to let the water in it must be replaced. If you are not getting 24 volts start at the transformer and work your way toward the solenoid valve to find where the voltage stops.
Aprilaire, a manufacturer of indoor air quality products including thermostats, air cleaners and dehumidifiers, also offers a line of whole house humidifiers. Installed in your existing heating and cooling system, humidity is produced by a supplied water source that flows over a water panel before being distributed throughout your air through the heating and cooling system. Issues you may need to troubleshoot with your Aprilaire humidifier include error messages and the unit producing too little or too much humidity.
Things You'll Need:
Replacement water panel
Turn down the control dial by one setting if condensation appears on your windows or walls.
Turn up the control dial by one setting if there is a lack of humidity, often indicated by dry skin or peeling wallpaper or paint.
Turn the control dial to "Test/Reset" if the humidifier does not run. Verify the heating and air conditioning unit blower is operating. If the heating and air conditioning unit is not operating or you are unable to resolve the issue contact a heating contractor.
Contact a heating contractor if you turn the control dial to "Off" and the humidifier continues to run.
Contact your Aprilaire dealer (see Resources) if you notice an error code on the display and the "Call Dealer for Service" light flashes.
Turn the control dial to "Off" and turn off the water supply if the yellow "Change Water Panel" light flashes. Lift the front panel off of the humidifier. Slide out the water panel. Insert a new water panel. Replace the front cover. Turn the control dial to "Test/Reset" until the "Humidifier On" light flashes. If you feel uncomfortable changing the water panel, contact a heating contractor.
Tips & Warnings
Purchase replacement water panels through your Aprilaire dealer or a heating contractor.
It would appear to me that you have lost the 24 volt power supply to the thermostat. In referencing the manuals for this thermostat, available @ www.honeywell.com, I've found that when the thermostat is not connected to the wall plate (plate mounted on the wall, that the thermostat either snaps or screws into), it will display the -AC. This being said, either the thermostat is loose on the wall currently, or your 24 volt transformer has died. Hope this helps.
I have the same type of Aprilaire humidifier unit with automatic temperature sensing control. My unit also displayed the 'E3' code. The HVAC technician was on site today and replaced the temperature sensing unit that is located outside the house. The humidifier is functioning normally once again.
I had that last night. I turned off the unit for a couple of hours and it came back on and ran and cooled. I have no friggin' idea if it will work but it got us through last night.
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