Condensor fan/compressor not running

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Old 06-14-17, 09:35 AM
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Condensor fan/compressor not running

Great forum. You guys have been great with my heating questions; hope you don't mind an AC one now that summer's almost here.

I installed a Hamilton central air unit 17 years ago and it has been flawless. I had it running yesterday for several hours, and all was fine. Then I noticed cool air ws no longer coming out of the vents. Checked outside, and the fan was not running; it seems the compressor ws not going either.

I checked all the connections today, and tried starting it up again. When I turn it on, the air handler fan runs fine. Outside, it just hums. If I spin the fan, it starts running but I think the compressor is still not running.

My guess is the capacitor? It's the original capacitor, has three leads - one to 240 volts, one to the compressor and one to the fan.

Does this make sense? Just replace it? Is there anyting else I should be considering?

Thanks.
 
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Old 06-14-17, 10:20 AM
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Since the capacitor has 3 leads, it's a dual capacitor. One section is for the compressor, the other is for the fan. The fan running after giving it a "push" is a classic sign of a bad capacitor, so it's a safe bet that the fan side is bad. With any luck, the other (compressor) side is also bad, causing the compressor to not start. There's a good chance that replacing the capacitor will restore normal operation.
 
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Old 06-14-17, 10:30 AM
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Thanks Bob1425. I'll get another one and give it a try. Does it seem odd that both sides would fail at the same time?
 
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Old 06-14-17, 01:10 PM
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It may be a little odd that both sides went bad at the same time, however it's not unheard of. For the price of a new capacitor, it's definitely worth trying.
 
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Old 06-14-17, 01:16 PM
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Thanks again. Ordered a new one; I'll post the results when I get it.
 
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Old 06-17-17, 10:13 AM
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Capacitor replaced ($12) and it's running like a dream. Thanks again Bob.
 
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Old 06-17-17, 10:41 AM
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Glad to hear that you got it working for the whopping sum of $12! Good Job!
 
 

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