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Old 07-26-2011, 08:43 AM   #1
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I turn my AC unit off but the compressor fan still runs


My air has been running just fine but yesterday when I shut it off (it was finally below 90) the compressor fan (I think, it's the one on the outside unit) kept running. Is this a problem with the relay switch? If so, where can I locate it? I'm fairly handy so I don't mind doing my own fixes but I know very little about AC so if anyone can direct me as to where to look and how to fix it, I'd greatly appreciate it.

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Old 07-26-2011, 09:02 AM   #2
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I turn my AC unit off but the compressor fan still runs


I meant to say my condenser fan.....

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Old 07-26-2011, 09:35 AM   #3
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I turn my AC unit off but the compressor fan still runs


Check the contract, may be stuck. Turn off your AC on thermostat. You should have a safe switch close by the condenser.
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Old 07-26-2011, 09:42 AM   #4
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I turn my AC unit off but the compressor fan still runs


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Check the contract, may be stuck. Turn off your AC on thermostat. You should have a safe switch close by the condenser.
I did turn the unit off from the thermostat and the waited for about 15 minutes and the condenser fan was still going so I went outside and removed the fuse plug (is that the right term?) because I didn't want the motor to burn out. I then waited about an hour and put the fuse plug back in. The fan started going immediately so I removed the plug again and that is currently where I am at with this.
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Old 07-26-2011, 09:46 AM   #5
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I turn my AC unit off but the compressor fan still runs


Your contactor is stuck.
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Old 07-26-2011, 09:51 AM   #6
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I turn my AC unit off but the compressor fan still runs


Is the compressor still running too, or only the fan?

Be extremely careful around the outside unit, as one potential cause of that symptom is a ground fault in the outside unit's wiring. Such a fault can cause all the metal parts of the outside unit to be electrified.
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Old 07-26-2011, 10:20 AM   #7
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I turn my AC unit off but the compressor fan still runs


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Your contactor is stuck.

Regarding that diagram: Is that what I'll find if I remove the panel on the outside unit?
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Old 07-26-2011, 10:23 AM   #8
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I turn my AC unit off but the compressor fan still runs


Yep. Just in case of a ground fault, shut off the power to the outside unit before you attempt to remove the panel.

Can you tell if the compressor and fan are both running, or just the fan?
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Old 07-26-2011, 10:24 AM   #9
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I turn my AC unit off but the compressor fan still runs


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Yep. Just in case of a ground fault, shut off the power to the outside unit before you attempt to remove the panel.

Can you tell if the compressor and fan are both running, or just the fan?

Absolutely. Just the fan is running as far as I can tell.
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Old 07-26-2011, 10:27 AM   #10
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I turn my AC unit off but the compressor fan still runs


If the compressor still starts and stops normally when you turn the thermostat on and off, it's not the contactor. Do you have a multimeter?
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Old 07-26-2011, 10:31 AM   #11
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I turn my AC unit off but the compressor fan still runs


Well the air runs fine if I turn it back on via the thermostat; is that what you mean? No I don't have a multimeter.
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Old 07-26-2011, 02:34 PM   #12
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I turn my AC unit off but the compressor fan still runs


might be time to just call a tech, I'm afraid. Without a multimeter there isn't much more troubleshooting you can do.
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Old 07-26-2011, 02:41 PM   #13
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I turn my AC unit off but the compressor fan still runs


shut the stat no cool call..then shut the disconnect next to the condenser...remove the access panel on the outside section/condenser and the electrical panel..."alls off with no call or power" can you push the contactor in/springs back out with a pencil or pen...or is it stuck closed..when that closes when your stat calls the compressor and fan both start....
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Old 07-26-2011, 02:52 PM   #14
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I turn my AC unit off but the compressor fan still runs


OK. Appreciate the help.

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