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Outside unit fan slows then stops even after replacing fan motor and capacitor

Outside unit fan slows then stops even after replacing fan motor and capacitor


  #1  
Old 07-28-10, 12:19 PM
S
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Outside unit fan slows then stops even after replacing fan motor and capacitor

First I replaced the capacitor having done this before and had it solve the problem though the capacitor wasn't popped out and leaking oil. Same thing fan starts slowly then stops after a bit had this problem last year when I had to nudge it to start it but then it'd go ok for weeks at a time.

Anyhow since the capacitor didn't solve the problem I thought well maybe it's the fan motor so I got another one. Same thing it starts runs for about 5 mins or so then slowly stops.

Could it be the capacitor I got is not the right one or isn't working .. what else could it be?

Thanks in advance.
 
  #2  
Old 07-28-10, 12:33 PM
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Your problem is likely worn motor bushings.
You may be able to check this by removing the condenser fan blade and moving the motor shaft side to side.
If there is any movement whatsoever the motor will need to be replaced.

Replacing bushings is not usually a good long term solution as there is normally scoring of the shaft which will quickly damage
the new bushing.
 
  #3  
Old 07-28-10, 12:36 PM
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already replaced the fan motor though.
 
  #4  
Old 07-28-10, 01:21 PM
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could it be that they just gave me a capacitor that isn't large enough? nevermind confirmed it with the parts store it's 5uf required by both fans and it's a 5uf capacitor.

So still and a standstill
 

Last edited by shanel; 07-28-10 at 01:52 PM.
  #5  
Old 07-28-10, 04:34 PM
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Could be a bad contactor. This is 240 volts and needs to be checked with the unit on with a volt meter. This should be done by someone qualified for testing high voltage circuits. Also have the amp draw on the motor checked. The capacitors need to be replaced with the same capacitance value as well as a voltage rating equal to or higher than the original. It's always best to have an HVAC tech troubleshoot high voltage problems than to take the chance of getting electrocuted.
 
 

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