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Re: Fan motor changes speeds on its own.
The control component or the control circuit for the fan can be causing the speed variation, or the bearings on the thing can be wearing (or contaminated) with the same result. If you can make a test bench, look (feel with a test pad, really) for drive transistors that get hotter than they should or an inconstant power resistor or shunt.
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The water level sensor fell into the fan. Unplug the humidifier from the wall, stick your hand in between the fan blade and locate the sensor. It is a small black rectangular piece the size of a nickel but rectangular and 3 nickels thick. It also has a 2 inch stem sticking out of that clicks back and forth when you push it. Stick the sensor back into the sensor whole and the flashing f will go away and the humidifier will come on again.
It could be getting clogged up. The lint screen has GOT to be kept clean or the machines fan will pull dust into the machine and it will cake on everything inside, including the fan(will make more sound while running) and can get into the bearings of the fan causing the problems you mention. It may also be a poor electrical connection. If you have ever OILED the motor...you'll have to clean it. It's not meant to have a lot of oil or grease on it.
I just bought a used one of these at a sale. Horribly dirty, grimy, rusty, etc. Anyway, similar problem with fan. Clean it off and WD-40 or silicon it. You should be able to see an almost immediate response unless it's another problem. My fan went from a low speed when turned on "High" and from a complete stop on "low" to actually turning on low. Anyway, I laid it on it's front, sprayed some 40 on the back fan bolt (pin, screw, whatever), then used a pen to click the safety so it would turn on with the back off and in less than a minute it was at full speed. Good luck!
If there is only one spot on the fan control dial that turns on the fan, it seems that the fan control pot has failed and needs to be replaced. You can call the company and order one and it should fix your problem 800 989 2299.