Outside Fan unit hums but won't start unless ...

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Old 06-24-13, 05:57 AM
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Question Outside Fan unit hums but won't start unless ...

Outside Fan unit hums but won't start unless I physically spin the blades to get it to "catch".

It will then run for 5 to 20 minutes and then "fault" out again. My inside unit will keep running until I turn it off.

I've been doing the following steps:
  • Turn unit on.
  • Sprint outside to unit (which is now humming or buzzing.)
  • Use tongs to spin blades (often times this takes several attempts to keep the unit running because blades seem to stick (only when unit is engaged.))
  • If it does manage to spin on it own, I enjoy cool air for 5 to 20 minutes until it stops.


Sometimes the I've been able to get it to start when I time my spinning of the blades with the start of the unit with the help of my son. This is a little easier, but cause the blades seem to move more freely when the unit is not engaged.

Thanks in advance.
 
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Old 06-24-13, 07:05 AM
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you have problem in the fan motor
or in the capacitor
check when its stop spinning if the motor get hot
 
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Old 06-24-13, 08:55 AM
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There should be a power disconnect within sight of your outside unit. Pull the disconnect to remove power to the unit (also handy for your hand propping to get it going since it should be close by). Does the fan blade turn freely. If not it could indicate that the bearings are going

When the unit shuts off after 10 minutes is it because the thermostat commanded it to turn off? If not it could mean the motor is overheating and a thermal protection is kicking in and won't allow it to run again until it cools down.

Do you have a volt meter? Even better do you have one with a capacitor test function?
 
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Old 06-24-13, 09:19 AM
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Thanks to both of you.

The outside unit will just shut off after 10 minutes, but the inside blower still runs. My T-stat has an indicator light stating that outside unit is not responding.

Could this be a contactor issue?
 
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Old 06-24-13, 09:31 AM
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It could be one of several problems. If your condensor fan slows down or doesn't stay running at maximum speed the compressor will shut down on high heat. There is usually a high pressure switch that will cause the contractor to open.

If you intend to service the unit yourself replace the fan capacitor first. It's the least costliest part that could cause your fan problem. Don't delay.....it won't get better by itself.
 
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Old 06-24-13, 12:15 PM
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Well, the duel capacitor wasn't the issue.

I guess it's time to try the fan motor.
 
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Old 06-24-13, 08:44 PM
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Bought and installed new fan. So far, it has worked without issue.

Thanks again!
 
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Old 06-24-13, 08:48 PM
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Good news

Just so you know.....you didn't replace the capacitor in vain. When replacing the fan motor it's recommended to change the cap. at the same time.
 
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