Replaced Bad Capacitor Now Just Hear Humming When Turned On

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Old 07-14-16, 07:36 AM
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Replaced Bad Capacitor Now Just Hear Humming When Turned On

Lost air yesterday. I knew enough to check the capacitor, which was bulging. It turned out to be dead. I installed a new one, and now when I turn on the air, all I get is a humming noise from the unit. The fan isn't turning. Anything simple I should be looking at?
 
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Old 07-14-16, 07:43 AM
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Humming noise from where.... the air handler or the condensor ?
Did you replace it with the same value capacitor ?
Does the motor spin freely ?
 
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Old 07-14-16, 07:48 AM
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Same value capacitor. I'll check where the noise is coming from and if the motor spins.
 
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Old 07-14-16, 08:29 AM
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Motor spins freely. The humming was more of a buzz and was coming from the new capacitor. I double checked the connections and they're all plugged in where they're supposed to be.
 
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Old 07-15-16, 01:21 PM
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Problem solved. The capacitor was definitely bad. But so was one, not both, of the fuses of the fuses at the unit. I didn't think to check since contactor was pulling. Turns out, I just wasn't getting enough juice. My advice to anyone is to always follow the path of power. I jumped the gun and looked past the fuses. Things like fuses, capacitors, and contactors are cheap and really are easily replaced by the average person.
 
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Old 07-15-16, 09:52 PM
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I've never heard a capacitor hum before.
If one fuse was blown that would mean no 240v and there shouldn't be any noise.... at all except from the contactor which gets it power from inside the house.

Your diagnostic methods were tough to follow but glad you got it working.
 
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