A possible reason is that the start-and-run capacitor on the fan motor has developed a fault, meaning it has gone wrong and doesn't work to start the motor any more. If you flick the fan blades and that spins the motor enough to get it moving, if it continues running until it next gets switched off, then you know the start-and-run capacitor has died.
As you asked this question here, it is unlikely you are already a licensed electrician, so you will need to call one to get this fault fixed, or have a complete new ceiling fan installed.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
If you do this work yourself, always turn off the power
at the breaker box/fuse panel BEFORE you attempt to do any work AND
always use an electrician's test meter having metal-tipped probes
(not a simple proximity voltage indicator)
to insure the circuit is, in fact, de-energized.
You don't say where this fan is - it could be in a wall vent as an extractor fan or in an air conditioner unit or in an electric space heater...
There could be many possible reasons why the fan won't turn. Here are just two of them:
1) Dust and dirt deposited from the air is clogging-up its fan blades and fan housing so the blades won't spin until you flick them. The fan and its housing needs to be cleaned out.
2) The start-and-run capacitor on the fan motor has developed a fault, meaning it has gone wrong and doesn't work to start the motor any more. When you flick the fan blades that spins the motor enough to get it moving and it will continue running until it next gets switched off by the AC unit's thermostat.
As you asked this question here, it is unlikely you are already a licensed heating and ventilation technician, so you will need to call one to get this fault fixed.
It will get worse unless you get it done soon.
If you do this work yourself,
always turn off the power at the breaker box/fuse panel
BEFORE you attempt to do any work
AND
always use a meter or voltage indicator to insure the circuit is, in fact, de-energize.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
home appliances
All dimmer switches hum. The older they get, the louder the hum. If you have compact florescent bulbs in the fixture, this will cause the switch to hum louder.
Electronic ballast does not hum as much as a choke. Minute hum of electronic ballast is the small inductor and capacitor producing an oscillation for high voltage generation,
If the hum is more like a whirring or spinning noise, the starter drive, also known as bendix, needs to be replaced.
hum tere se puch rehain hain g
bhai hum aap sa poch rahay hain
What kind of noise: A motor hum? A high-pitched sound? Which lights: the kitchen lights? The ceiling fan light? Sounds like you have your lights on a dimmer and that will cause a high-pitch sound. The noise is motor hum and a "clinking noise" almost like the glass domes are loose (they aren't). The lights I was referring to are the ceiling fan lights. I am not using a dimmer switch. Also, it is a Hunter ceiling fan (I don't know the model. It was a mid-range fan as far as price: $109.00)
Motors are electric, and they normally hum. Engines roar.
There are many reasons why your ceiling fan could buzzing. One reason can be losse screws. Tighten the screws in the blades. If you have found the screws are loose in the blades, this could be the main cause or only cause of your problem. You can find more info about stopping your ceiling fan buzzing on this website: http://www.ceiling-fan-wizard.com/noisy-ceiling-fan.html
choir members in your pipes
Probably wheel bearings or wheels are unbalanced
most likely a cooling fan for the engine or tranny, but I've seen ECUs hum intermittently when vehicle is off.
Yes. It means that the CD is spinning... that is the hum you probably hear. Otherwise, it could be that dust collected on the fans in the Xbox and the weight from that unbalanced the fan, which would cause it to rub on the outside of the box containing the fan. But is most likely the CD spinning.
There may be three possible causes of fuel pump hum on a Ford Escape. These are the exhaust leak, wheel bearing, or a bad tire.
many times it'd the run capacitor (that cylinder) where the wires from the fan run. if the fan is turned on and you hear a hum, tap the blade. if the fan turns, then that's the problem.
A bad radio speaker
induced currents,usually caused by damp weather wet etc
might want to check your drums