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Old 08-05-2015, 05:50 PM   #1
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Fan Noise after replacing start capacitor


Hey y'all!

I was out of town this past week and my wife calls and the AC is out.

So I give it a whirl. Fan not turning. I replaced the GE 97F5705 with the Genteq 27L570 which seems to be the newer but smaller in size replacement.

Anywho, I hook it up, fans start whirling, cool air coming out of ducts, but its really noisy and that can't be good. Any ideas what it could be?

I'm under the impression I have the right replacement capacitor.

Thanks for any tips,

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Old 08-05-2015, 05:55 PM   #2
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The microfarad rating is the size not the physical size. You should have something like 45+5mfd, 370 or 440 VAC on the original. Check it and compare to the replacement. If wrong replace it with the proper size ASAP.

You can replace a 370 VAC with a 440 but not the other way around.

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Old 08-05-2015, 06:01 PM   #3
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Everything is same:

5uf
+06 - 06%
50/60hz
370VAC
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Old 08-05-2015, 06:29 PM   #4
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I assume it is the furnace fan not outdoor fan.

Does not matter anyway as we cannot diagnose noise over the net. Could have worn out bearings.
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Old 08-05-2015, 06:32 PM   #5
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Ya outside ac unit. Figured as much if it wasn't the capacitor. Guess I'll have to pony up. Thanks for the help.
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