Need help fixing electric fan

Thread Starter

mrel

Joined Jan 20, 2009
156
  1. Hello
    Trying to figure how to fix this electric fan ,I can feel fan housing vibrating but fan not spinning, if I spin fan blade the fan will spin few seconds.
    The fan has 3 speed.
    I open the back cover of the fan beside the switch there AC Capactor small plastic black box mark 2.5 uf 250 volt.
    mrel
 

GopherT

Joined Nov 23, 2012
7,983
  1. Hello
    Trying to figure how to fix this electric fan ,I can feel fan housing vibrating but fan not spinning, if I spin fan blade the fan will spin few seconds.
    The fan has 3 speed.
    I open the back cover of the fan beside the switch there AC Capactor small plastic black box mark 2.5 uf 250 volt.
    mrel
Generally, there are a few possibilities.
1) the oil-impregnated bushing on the motor is dried out and has high friction (usually if not used in a long time).

2) the capacitor has failed (often from not being used but can just get worse with age and fail)

3) the power switch fails - builds up oxides (looks like "carbon" but it is black copper oxide) and high resistance on the switch. "High" can only be a few ohms or tens of ohms on your ohm meter but enough to cause a problem.

If the blade turns easily by hand, and the switch has reasonably low resistance, I would focus on the capacitor.
 

Kermit2

Joined Feb 5, 2010
4,158
Add some oil to the shaft. If the back end is not accessible, then minor disassembly is required.

I've fixed many many fans this way. The fact that you can spin it by hand and it works for a short while is a good indicator it needs lube.
 

#12

Joined Nov 30, 2010
18,076
If the switch is good, and the oil and the capacitor don't fix it, the motor windings are bad.:(

I have never bought a 20 inch box fan. I find them set out on trash day, replace the fuse, oil the bearings, and use them for years.:p
 
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