pretty sure its the 3 speed pull chain switch.$4.50 to $6.00 at home depot or lowes or hardware/elecrtical store.
how 2 replace switch.
1.turn off breaker to fan/fan lights,probably that whole room.
may need extension cord & floor lamp from closest room with electric, so u can see.
2.need 6ft step ladder to get up to fan.look see how to get to fan speed switch. speed switch unscrews from outside but body of switch is inside fan cover.
3. need to take fan off ceiling to replace switch.
4.switch has 4 wires, power feed into switch and 3 selector
wires that go to high speed winding,medium speed winding and low speed winding.
speed selector switch has 4 settings, off, low,medium,high.
about ac circuits , black wire is 120 volts, hot.
white wires are neutral return wire. an ac voltmeter will read 120volts ac with its red and black probes between black,hot and
white= neutal=ground which is green. If wired properly and polarity was observed, white and green ground wires both connect to the neutral ground buss bar in the circuit breaker panel box and are the same electrical point.
black wires,and the selector handle getting the hot juice into the fan and white returns the used juice to the circuit breaker panel box.
If polarity was observed, you can touch white and ground without getting a shock.
black will jolt or even fry you dead, so make sure the breaker to the fan is off, so that the circuit is de-energized before you touch it.
PLEASE NOTE--- make drawing on paper of what color wires from the fan motor go to what color wires on the selector switch.
If the switch has 4 black wires, you need to put different color electrical tape as a marker, on each wire. or ,to be cheap, you can use white paper,scissors to cut paper,and pencil and write 1,2,3,4 on the paper and tape to the 4 switch wires.
that is: wire # 1 from the switch goes to the black wire from the wall--ac hot
wire #2 from switch goes to yellow fan motor winding,
wire # 3 from switch goes to orange wire from fan motor
wires are specific and NOT interchangeable.
go to www.ehow.com
& type into search engine box
how to replace fan motor speed selector switch.