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One of 2 things has failed Chris. Either the motor thermistor has opened from overheating or the capacitor has failed.
You can test the capacitor by moaking sure the sel,ector switch is off and the fan is unplugged. Using an analog meter probe the 2 wires going to he cap on a resistance scale of R x 1000. If the meter jumps and then returnes to infinity the cap is probably good. Each time you reverse the leads (polarity) it should repeat the monentary jump and return to infinity.
Most of the thermistors are hidden in the motor winding area and are connected to a hair like wire. If you can find a replacement thermistor at an electronics shop bonus! But changing it out will really test ones abilities... even my own. My success rate is around 50 % because as you try to get access to the thermistor... you end up breaking another hair like winding wire. Been there done that.... i.e broken wire .004 dia. or smaller.
the fan changes speed by inserting a capacitor of different values in series with the motor .. direct drive to the motor is the fastest speed .. a large capacitor in series slows it down a bit and a smaller capacitor slows it down more ... so if your fan is running at full speed all the time then one of the capacitors is shorted or the switch is bad .. if its stuck on one of the lower speed settings then the switch has a bad contact .. the capacitors are mounted together in a small box with several wires going to the pull chain switch .. you can replace the capacitor box .. and you can replace the 3 or 4 position switch ... or you can remove all that stuff and put in a remote controled system .. that involves a box that just fits inside the fan .. it is hooked to AC power and neutral .. it then hooks up to the lilght and the fan giving you control over both .. you can vary brightness and fan speed .. you would no longer need the fan or light pull switch or the capacitors ... you could also get a new fan having such a controller .. since yours is fairly old it might be worthwhile to upgrade .. some of the remote controls allow you to set a temperature ..if the room goes above that temp then the fan turns on automatically and the speed is determined by how much higher the room temprature is from that set value .. some remotes also give you an additional very low fan speed .. thats nice at night when you just need a gentle breeze .. some also allow you to set a delay before the lights go out after you have clicked "turn off" ... that gives you time to exit the room or get in bed before the lights actually go out ... kindof nice features that might make it worth while to up grade .. to get parts for your old fan see this URL http://www.ceiling-fans-n-more.com/hampton-bay-ceiling-fan-parts.php
since Home Depot sells hampton bay .. then they might have parts as well .. worth a try .. you can also see new models there ..
The Inteli-Touch system does have a slight learning curve.
How the system works is. You turn the power switch on, and leave it on, all the time. To set fan speed, you press and HOLD the fan button and it will go. . beeeep. beeeeeeeeep. beeeeeeeeeeeeeep. beeeeeeeeeeeeeeeeeeeeep beeeeeeeeeeeeeeeeeeeeeeeeeeeeep beeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeep (higher pitched) when you reach your desired speed you let go of the fan button and it stays on that speed. So if you want to go to speed 4 you wait for the fourth beep and let the button go. To turn off the fan, press and release the fan button, to turn it back on to speed 4, press and release again. It has a memory. If you want to go to a higher speed while on speed 4 (or any other speed) just press and hold. To slow down the fan, you must turn the fan off by pressing and releasing the fan button, then pressing and holding until you get to the speed your desire.
The instructions which came with the fan should explain the rest. After you get used to using the IT control system, you will love it. I do. I have two Casablanca IT Victorian II fans in my living room. They are featured in this video. http://www.youtube.com/watch?v=2pv55wZqohs
On high speeds, they usually do. They have like a vibration sound to them. Have you tried each speed on the fan. With the lights, you're not going to get a humming sound. Only when the fan is on. And yes, usually at the higher speeds (3 speed fan), they do seem pretty loud. I'd have a family member or friend listen and get their feedback before contemplating changing it. Feel free to contact me back with your feedback, and I can help you from there. Good Luck, and I hope this works out for you. - Jim
The heat sensor or thermal switch can go bad, so can the motor.
Try a few things;
shut off power going to fan. try cleaning out the thermostat housing using some compressed air on low pressure, or use a vacuum cleaner on blow, or a hair dryer on no heat. you can also spray the inside with contact/motor cleaner(home depot electric dept.) and then blow the thermostat out of any dust or particles that may have lodged inside.
To see if the thermostat works at all, turn power to fan on. Take a hair dryer on heat and place near thermostat - to see if fan comes on.
To rule out a bad motor, the thermostat can be bypassed by hooking up the feed wires to the fan itself, if you're handy with wiring.
Ventamatic web site does list replacement parts for fans... Good luck!