Contactor buzz or something else?

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  #1  
Old 07-02-19, 05:49 PM
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Contactor buzz or something else?

My outside compressor was making an buzzing noise but the unit was otherwise working.. I believe it was the contactor.... when I moved the contactor with my screwdriver the buzzing would either stop or change frequency. I put a new one in and it seems to have stopped but I wanted to assure I didnt mask a bigger issue.

Can I assume the contactor is the problem and not elsewhere because the unit was working and cooling?

 
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Old 07-02-19, 07:58 PM
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Some contractors can be noisy. Some new ones can be as noisy as the ones they replace.
If you replaced the contactor and all is quiet now..... you're good.
 
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Old 07-03-19, 05:37 AM
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Do capacitors buzz?

Is it the coil thats buzzes on a contactor? Nothing appeared loose or broken on the old one... just the pads slightly blackened.
 
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Old 07-03-19, 05:59 AM
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Hi, Pads meaning the contacts? They can be black but should not be pitted badly, replace and do not clean, best to replace the whole contactor as you did.
Don’t recall hearing a cap buzz.
Geo
 
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Old 07-03-19, 09:03 AM
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No.... capacitors don't buzz.
Changing the contactor is a smart move as the contacts get blackened with age. The part that buzzes is the metal armature that the coil draws in. If the armature doesn't sit flat on the coil.... it buzzes.
 
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