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Central air fan not running  Rate Topic 
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 Posted: Wed Aug 2nd, 2006 09:12 pm
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AceHighFlush
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Hi everyone.  I've been surfing all over the net trying to find a place that can help me find out whats wrong with my AC.  Hopefully, this is the place.  Here is my problem.

I came home and the central air unit outside was buzzing but that was it.  No fan, nothing.  I shut it off and waited about an hour to start it up.  This time it sounded like the compressor was trying to run, but the fan wouldn't.  I gave the fan a nudge to see if it was binding, but it ran freely and actually started to run.

Although the fan didnt seem to run at 100%(maybe 75% normal speed) cold air was again flowing through my house........for about 10 minutes.

The fan on the central unit stopped and would not go even if I prodded it a little.  The compressor was still making a noise like it was trying to work, and parts of the unit were extremely hot.

I have read similar posts, but I would more than appreciate any insight as to what is actually going wrong and what I would have to replace.  I am a jack of all trades, and master of none and dont mind jumping into a project I know nothing about as long as I have some good advice leading me along the right path. 

And brothers and sisters, I'm at the bottom end of the learning curve when it comes to central air. Thanks.

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 Posted: Thu Aug 3rd, 2006 03:12 am
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AccApp
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You solved your own problem right before your own eyes. Replace the condenser fan motor. Any mfg's markings on the unit? Model? Serial number?

The compressor has an internal limit which protects it if it gets too hot. When the fan stalls the compressor overheats and stops. Applianceman had a post a while back about getting the fan blade off the motor. It's not a hard job if you can get the right motor.



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 Posted: Thu Aug 3rd, 2006 05:15 am
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applianceman18007260692
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before you replace the fan motor check the capacitor to see if its leaking or swollen  and let us know dude

 



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 Posted: Fri Aug 4th, 2006 09:11 pm
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AceHighFlush
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Hi guys.  I checked both capacitors and they look fine. So I went and bought another fan motor and a new capacitor for it(was only $6)  Here is my dilemna....there is an extra wire on the new motor.

On the old motor there were 3 wires, yellow, black and brown.  On the new motor, I have yellow, black, brown and brown/white.  I was told to hook up the brown and brown/white to the new capacitor and then just connect the Y and Bl to the old connections.....but.....

When I looked at the old connections it went like this.  Yellow was connected to the main power switch while the brown and black were connected to the capacitor.  On the black connection side of the capacitor there is a black jumper cable leading to the power switch opposite the yellow.  Soooo, if I hook up the new motor and connect Br and Br/wh to the new capacitor, Y to the Y, I still have the black that I'm really not sure where it should go.

Should this also be connected to the capacitor? along with the original black jumper?  If you can decipher this mess, I would be grateful. 

Sitting here sweating my Ace off.......

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 Posted: Sat Aug 5th, 2006 11:09 am
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AccApp
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If the yellow lead is hooked up to unswitched L1, hook the black wire up to switched L2. Just make sure you get the rotation direction correct, most replacement motors are reversible. Also make sure you secure the new cap so it does not bounce around. Take out the old cap and remove the black jumper wire, hook up the new motor's black wire where the jumper was connected.



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 Posted: Sat Aug 5th, 2006 05:07 pm
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AceHighFlush
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hey Ahammer. I'm glad ur on. Dont leave , cuz this is not working

 

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 Posted: Sat Aug 5th, 2006 05:11 pm
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AceHighFlush
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On the old mtr, the black and brown went to the cap, while the Yellow looked to be hooked up directly to the "main switch".  I was told to hook up the brown and brown/white to the new cap, and on one side of the cap, attach both the black wire and the black jumper wire that was hooked up to the old cap.  Well, i did that and nothing.  The unit just buzzes and no fan movement.  Before, I could at least give the old fan a push and it would work for 10 min.  Now, nothing...Let me know what you know please.....

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 Posted: Sat Aug 5th, 2006 05:41 pm
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AceHighFlush
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Hi Ahammer.  Thanks, I am off to hook everything up as you described... Give me 5-10 min and I will let you know....thanks.

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 Posted: Sat Aug 5th, 2006 06:04 pm
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AceHighFlush
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hi ahammer. Ok, i hooked it up as you said and still nothing.. when set to cool, the unit buzzes and the switch depresses on the unit, but nothing else......I tested for power at the lead points and it came up 0.....if this is a fuse problem i'm gonna kick the dog.........real hard.......Let me know ...thanks

 

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 Posted: Sat Aug 5th, 2006 06:16 pm
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AceHighFlush
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Hi Ahammer....Ok, i just kicked the dog....not getting a reading...i'm running down to the hardware store to get replacement fuses.....let you know in 15.....thx

 

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 Posted: Sat Aug 5th, 2006 06:55 pm
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AceHighFlush
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Lol, didnt kick the dog, but gave myself a good kick in the Ace.....After changing the fuses, she's up again and purring like a kitten......My pregnant wife and 3 year old daughter send their thank-you's.......And I send a thousand thank yous for staying on line with me while I muddled through this:D....You are truly a scholar and a gentleman Ahammer and the cyber repair world is a better place with you in it.  Thank-you. 

Question though, first thing i did was check the fuses and they were fine.......did I do something while changing the fan motor to blow the fuses?

Signed,

Cooling off with an ice cold beer in my soon to be cooled off home....;)

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 Posted: Mon Aug 7th, 2006 10:08 pm
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applianceman18007260692
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well done hammer! keep up the good work!



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