My ceiling fan is 8 years old and worked just fine until a few days ago. I
noticed the pull chain on the light stopped working. Before I could replace
the switch, it started to work again and seems to be okay; but the three
speed fan is now a one speed. I changed the fan switch, taking care to get
the 4 wires right. This didn't fix the problem. Am I missing a clue here?
What else could be wrong?
On Thu, 10 Jun 2004 8:04:04 -0700, Mike Cummins wrote
Is the fan switch mounted on the fan or in a wall box? Some fans have the
speed control capacitors and switch built into them rather than placed
externally. A 3-speed fan has two capacitors for the speed control. The
"hot" line conductor is connected to a switch that goes straight-through for
high speed, through one capacitor for low and through both in parallel for
medium. (There is also a "run" capacitor for the auxiliary winding). If the
low-speed capacitor has failed by shorting, then all the switch settings will
result in high-speed.
Here's a typical control circuit - couldn't show the switch properly, but if
you're still with me, you'll understand:
Line +-+ Hi -> +-----------------------+----------->Yellow>------+
M Cap | |
+-+ Med (Both Caps) -> +--||---+ |
L Cap | |
+-+ Low (Low Cap Only) -> +--||---+ |
| |->Purple>--+ |
|Rev | ) Main ) Aux
|Switch| ) Winding ) Winding
| |->Brown>---+ |
To repair this, you can replace the burned capacitor, or you can remove the
switch and speed capacitors and install an external speed control in a wall
Do NOT just put an external control in place w/o first removing the internal
components. You can damage the fan that way (which might involve smoke and
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