CAP VSC-DNe controller problems?

Ok, so I have a ten inch dura-breeze speed controllable fan. I have it hooked up to a new Cap vsc-dne thermostat. The thermostat turns the fan off and on rapidly causing a woofing sound. It is supposed to be a speed controlled thermostat, is this normal? Is this bad for my fan? Any input would be great?

Sounds like speed control on the fan is having a little fight with speed control on vsc-dne. Use only one speed control. Turn fan speed control to full and adjust speed with vsc-dne and see what happens.

I got one of those;
either I don't understand it (maybe) or
the friggin thing is stupidly designed (also likely)
or its broke (very likely given its a CAP)
..if/when you figure out how to actually get it to stop a fan from humming, et I'll be lurking...
good luck bro

Vsc-dne is not a variac based speed controller so it will make motor groan at reduced speeds.

Its not a groan, its a woofing, because it is rapidly turning it on and off. The speed it turns on and off slows way down when it wants the fan to run slower

Try the speed control on another motor like a different fan. Might be a bad control.