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Old 07-12-2010, 03:21 AM   #1
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


Hi, I have a Carrier unit that I just recently noticed making a strange noise when it turns off. If you're near the outside unit when it turns off you'll hear a second or two of knocking (like someone sticking something in a fan blade to slow it down). I'm concerned about this as I know these units can be expensive. Our water heater seems to be on its way out as well, so we really don't need another even bigger problem. But I'd rather know than not know. Am I in real trouble here?
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Old 07-12-2010, 06:26 AM   #2
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


Without hearing the noise. Can't say if its serious or not.
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Old 07-12-2010, 10:11 AM   #3
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


Do you know a good AC service company? Ask your neighbors if you know any of them, friends or co-workers. You might want to pay for a service call so a good tech can check it. The water heater may just need to be flushed and you may need a new heating element - they cost about $10.

Frank Lardino
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Old 07-12-2010, 10:50 AM   #4
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


A distinguished gentleman from Canada on another thread on this very forum told me, for my compressor with the same symptom, that it was a broken motor support spring inside the compressor, with no cure [and an indefinite service lifetime remaining for the compressor].

But it could also be a worn fan bearing or a loose fan blade setscrew.

Last edited by Yoyizit; 07-12-2010 at 10:59 AM.
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Old 07-12-2010, 12:32 PM   #5
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


Guess I'd better find someone to look at it. *fingers crossed*

Thanks!
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Old 07-12-2010, 06:42 PM   #6
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


Distinguished, Hah, Cranky, Yah.
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Old 07-12-2010, 07:49 PM   #7
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Central air (outside unit) makes strange noise when it turns off. Am I in trouble?


Oooooook...
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