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Depending on your model, the CF could mean the filter needs to be changed or that the unit needs to be reset. If your model doesn't have a reset button, you can unplug the unit from the outlet for 5 minutes.
Do you mean Dehumidifier? A machine that takes the humidity out of the air. If this is what you mean and you hear the fan motor working with no water dripping then the problem is that the coil which holds freon gas has leaked out the gas and can be recharged again with the leak fixed of course. Depending how old the unit is you may be better off buying a new model. Repairs can be costly. Hope this helps!
Hello, You can tell if the humidifier is working if you see water flowing into the drain line. Also , when the furnace turns on you should here a click at the solenoid valve on the humidifier, this means that the solenoid is open and letting water into the humidifier.
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
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.