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If you can easily get to motor I would unplug unit and check motor to see if it turns freely. If it does I would plug the unit back in and see if the humming noise is coming from motor. Ifyou decide that the motor is the source of the noise and you can do so safely spin the fan and see if it will try to run, If it does I would unplug unit and give fan motor and blades a thorough cleaning. Clean any hair,lint or dust from aaround motor shaft. A small motor like these does not take much to slow or stop them. Plug it back in and try it. If it stiil does not work I would replace the motor. Hope this helps. Thanks
Humidifier should be powered from the furnace heating 24 volt terminals through a humidistat and then to your humidifier. The fan and the water solenoid on the unit should come on together. if the water is not turned on the fan should still run, unless the unit is not plugged in.
If you are having problems getting the vaporizer to work, just add salt to the water (seems so crazy simple but it works!). Also, make sure the removable column is tightly fixed inside; give it a few minutes and it should start to blow.
Depending upon your model, start at the above link and read the instructions. Just click "details" under the model in question.
you can bypass the humidistat by shorting the 2 brown wires on the bottom of the humidifier. just remove the 2 wire nuts and touch the 2 together (just 24v)if it comes on then there is a control problem with the humidistat or wiring if it doesnt come on the control board or transformer may be bad or you dont have 120v to the humidifier on the plug. also make sure your furnace blower is running cause the hum cant come on if its wired properly unless the fan is running. you also may want to go to www.aprilaire.com and get a maintenace kit from their online store. it comes with pad and new hose along with a couple other things.
On my water wheel several parameters must be met. 1. Power on, cord plugged in. 2. Water in tank, the float arm needs to move to indicate water present, the red light on the dash indicates no water. 3. Humidity controll set higher than the room atmosphere humidity, clockwise is higher on mine. 4. The fan speed selecter must be on either high or low, the fan won't run unless one position is selected. I hope this helps
if humidifier was wired into thermostat circuit for power instead of seperate transformer , this can happen. you need to see if you voltage going to the solenoid valve. if you do , and it isn't opening, the valve is bad . this is assuming that it is using a # 50 relay to come on only when the fan runs . . make sure the water valve is open