Celing Fan Hum
 

I have a ceiling fan that hums badly. Is not dimmed is running at full
speed or one notch down with the pull chain. Is not a 120Hz buzz but a slow
hum modulated by the blade position. In other words the hum changes
cyclically around the blade circle. It is not mechanical because it stop
immediately after cutting power.

Any idea on what to look for when I get it down?

Thanks

MG

"MG" wrote in message
nk.net...
I have a ceiling fan that hums badly. Is not dimmed is running at full
speed or one notch down with the pull chain. Is not a 120Hz buzz but a
slow hum modulated by the blade position. In other words the hum changes
cyclically around the blade circle. It is not mechanical because it stop
immediately after cutting power.

Any idea on what to look for when I get it down?

Thanks

MG

I had a fan do this and it turned out to be a loose light fixture attached
to the fan that was vibrating. If your fan has a light fixture attached, I'd
check that before taking the fan down. On mine, each bulb has a cover
attached by three small screws. I just tightened the screws and the hum went
away.

David

On Sat, 04 Jun 2005 14:10:11 GMT, "MG" wrote:

I have a ceiling fan that hums badly. Is not dimmed is running at full
speed or one notch down with the pull chain. Is not a 120Hz buzz but a slow
hum modulated by the blade position. In other words the hum changes
cyclically around the blade circle. It is not mechanical because it stop
immediately after cutting power.

Any idea on what to look for when I get it down?

Thanks

MG


Maybe the starting capacitor; especially if an old unit.
In the US, the AC is at 60 Hz which is a fairly low
frequency. The fan speed is likely a harmonic of
60 Hz as well.

Thunder

"MG" wrote in message
nk.net...
I have a ceiling fan that hums badly. Is not dimmed is running at full
speed or one notch down with the pull chain. Is not a 120Hz buzz but a
slow
hum modulated by the blade position. In other words the hum changes
cyclically around the blade circle. It is not mechanical because it stop
immediately after cutting power.

Any idea on what to look for when I get it down?

Thanks

MG

Sounds like the motor has a problem.

Have you checked all of the wiring? Especially if the motor is grounded?

WAG

good question