Hunter Fan model 53214 has developed an high pitched whine at all speeds, balance seems perfect...what do you suggest?

SOURCE: My Hunter fan will only switch from high to low speed and won't

if the three speed switch is functioning the middle speed winding is bad.  Either replace the fan or hook up a wall speed control and keep the fan on high.

SOURCE: hunter speed control problem

I have the exact same problem. Called Hunter's tech support and they confirmed the capacitor must be bad. This is the black box that has 4 wires going to the switch. They are sending me a new one for under $12. I haven't received it yet, but the wires from it going to the switch can be removed from the switch by shoving a paper clip along side the wire, this'll release the spring clip holding the wire in. Not sure, but I may have to cut and wire nut any wires that go elsewhere.

I recommend you call them too and as long as you have the 5 digit model number (usually on top of fan) they should be able to get you what you need.

P.S. it is highly unlikely that it is in the switch. I tried replacing it with one from Home Depot and I actually got Low-Off-High, which is worse. The Hunter tech support guy said you can't use after market switches with their fans.

SOURCE: Hunter ceiling fan is stuck on high speed

If it has a chain, buy a light dimmer switch so it will not have 1 speed anymore. If it has a remote control, buy a new remote control like your old one. Try different numbers on remote control.

SOURCE: Hunter ceiling fan-just installed -possible speed control problem

Sounds like the fan is defective. All internal wiring from the switch to the motor is factory installed. The fan has power going to it. Just to make sure, double check the wiring from the ceiling fixture to the fan.
Problem could be a faulty switch on the fan or faulty motor(bad winding for med. speed). Try reverse switch on the fan to operate the opposite direction and see if medium speed works. If medium does work in opposite direction, it pretty much points to a defective fan. In any case, unless you discover that the ceiling wires were reversed going into the fan, I'd say new fan to the returns dept.

SOURCE: Constant high pitched whining noise. Increases

you could be low on transmission fluid check that and make sure it registering properly on the dipstick.