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AC unit capacitor replacement - is this normal?

Posted on 4/1/25 at 7:38 pm
Posted by HeadChange
Abort gay babies
Member since May 2009
43897 posts
Posted on 4/1/25 at 7:38 pm
AC unit stopped working and after a quick google search capacitor seemed to be the culprit. Since it’s a cheap part and easy to replace I figured I’d replace it regardless. Matched the units/ratings on old capacitor with the new one, hooked it up and put the fuses back in.

Once I did that, the fan started to kick on, then stopped - this cycle happened over and over for about 2-3 minutes and then the fan came on and got up to speed and is acting and sounding normal, have cold air going through the house.

I figured maybe because it’s a new capacitor, it doesn’t have a stored charge so the initial startup would be clunky, but the internet says a new capacitor doesn’t need a pre charge. Is it just Chinese junk or something else? Or is that normal behavior with a new capacitor it?
Posted by LEASTBAY
Member since Aug 2007
15637 posts
Posted on 4/1/25 at 7:52 pm to
I have a carrier infinity and it does something like this when changing the capacitor. Something with the thermostat resetting and the computer boards or whatever I figure. Do you have a similar style unit?
Posted by HeadChange
Abort gay babies
Member since May 2009
43897 posts
Posted on 4/1/25 at 8:01 pm to
Dunno, looks like a normal residential unit to me. Brand is Ruud, didn’t look at anything other than the capacitor really. It’s at my moms house which is raised so I just wanted to be in and out with the capacitor
Posted by dragginass
Member since Jan 2013
2969 posts
Posted on 4/1/25 at 8:15 pm to
Sounds more like a fan motor issue than a capacitor issue. May have just been coincidence.
Posted by jlsufan
Baton Rouge
Member since May 2021
356 posts
Posted on 4/1/25 at 8:39 pm to
was it a dual capacitor? in other words did it have 3 terminals....you may have hooked it up incorrectly with the start and run capacitor terminals switched
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