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Thank you for your question do you have a volt meter or a way to verify that the fan motor is getting power from the speed control. if so you will need to check the motor to see if it is getting voltage from the controller to operate. if the motor is getting voltage to run from the speed control and is not running it may be a capacitor. Try to spin the motor by hand with power to it if the motor starts to operate most likely you have a bad capacitor if not and you are getting voltage to the motor then you have a bad motor.
You can check capacitance using the NF setting on your meter if it is capable. What is the model of your fluke so I can check if it has the capabilities of checking a capacitor? Also to check voltage on the wire you could use a razor knife and bare a small portion of wire, just make sure you use electrical tape to wrap the wire back up after testing.
Graingers will be able to match either the capacitor or the motor if you have have one were you are located. You could also send me a picture of the motor data label and i could try and locate one for you online or direct ship it to you with a premium service.
Sounds like your meter will most likely not be able to check capacitance, but you can try and spin the motor while it is trying to run, if the capacitor is the issue the motor will likely start running so watch your fingers. Check it on all 3 speeds you may have lost a speed as well as the capacitor. One last thing I am not sure how much this humidifier costs but unless you really want to fix it, it maybe an option just to replace the whole thing.
But I can try and help you out the best I can from the PC.
We can do a premium service and you can send me your number and I will respond to you with my info.
Grainger stocks or can get just about any motor you need I use them for my company when I have a motor that is not standard. They can cross any motor or you can through their website. If you find the motor or a cross and dont like the price I can certainly see if I can get it cheaper for you. You can just PM me those pics if you would like.
I would say your issue is in the speed control the motor or the cap.
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Let me look on some details, OK?
not the capacitor then, I would definately be suspicious of the motor. If you can check the motor for voltage after the peed control. If you are getting power to the motor and it is not operating then it needs to be replaced.
just upload your pictures here and I can help you locate one!
You maybe able to match a motor like that up at johnstone supply, but without any numbers I can not do it online. I have exhausted my resources with honeywell also they do not stock those motors for resale. Sorry but I think thats all i can do from here!
If you can find some numbers on the motor I maybe able to do more, also if you could please rate me 3 star or above I would appreciate it!