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Old 07-20-2009, 09:34 AM
 
660 posts, read 2,304,654 times
Reputation: 545

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Hi,

Yesterday, one of my outside AC Units (larger) one stopped working. It was not giving any noise and sending in the hot air through the registers.

Today, I turned it on and the AC unit was making a loud buzz noise but the fan was not running. Not sure what is wrong. So, I turned it off.

Any ideas what is wrong?

I live in Houston, TX.
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Old 07-20-2009, 09:43 AM
 
Location: Lafayette, Louisiana
14,097 posts, read 14,425,325 times
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Hard to say without seeing it in person but it sounds like either the fan motor needs to be replaced or the capacitor needs to be replaced. Best to call a tech and have him test the equipment to see what part is bad and replace that part.
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Old 07-20-2009, 09:51 AM
 
660 posts, read 2,304,654 times
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Hi SailOrDave,

Thanks for the fast reply!

In either of the case how much do you think will it cost.

Motor Replacement = $$$

Capacitor Replacement = $$$
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Old 07-20-2009, 10:02 AM
 
Location: Lafayette, Louisiana
14,097 posts, read 14,425,325 times
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I honestly don't know. I work with a guy who does home AC repair as a side job. He said replacing a capacitor is cheap and easy. He says in most cases he's seen, the capacitor will go out before the motor. The motor is harder and more expensive to replace so the labor may cost more. Call around for estimates and a repair call out during normal working hours to avoid overtime cost. If you have them come out, pay for the works incuding unit cleaning and refrigerant level check. Some repair services will take payments. If not, see if your bank will offer a signature loan of $500 to $1,000 for home repair.
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Old 07-20-2009, 11:49 AM
 
3,020 posts, read 16,688,489 times
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Default More than likely it is the capacitor..............

These new ones are not like the old ones. The old ones had like PCB's in them, the materials got changed.

The new ones do not have as good a working life. They also have a shelf live, can not set on the shelf forever before you get it. Plus you must be sure it is the exact replacement one for that unit. Hopefully with the same identical stock number.

Easy to replace. You could just pull it, take it with you to an electrical supply house, see if you can get a replacement, try that first at the cheapest possible cost if money is going to be a concern. wee gamble but can work out well. If the motor is gone, usually that puppy is totally dead, they do not buzz or squeak or nothing.

Always hold on to the old one, bring it back with you. That way you have a record of exactly what the OEM one was. You can get this dribble that this stock number replaces that one and they might not be the same. May or may not be correct, the World is a funny place. Might also look at the packaging of the new one and see if it is dated. Probably should be.

Mark your leads prior to disconnect. Always helps to be prepared for Murphy's Laws and be able to get back exactly where you was. Maybe it polarized, maybe not. I have no clue at this keyboard. Some of those capacitors are dual, two in the pak, serves more than one function. I don't monkey with AC's much. Don't even have one installed. Just be sure it is the exact replacement.
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Old 07-20-2009, 03:00 PM
 
27,234 posts, read 20,934,527 times
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You can sometimes hear the transformer buzzing when it's not working but it's not an extremely loud buzz. You might also be hearing the contactor chatter. I had a contactor that would pull in but because an insect had crawled in between the contacts it had pitted the contactor beyond repair. This was on a unit that was slightly older than a year. I replaced the contactor with one that has a cover for the contact points. You might be hearing the compressor hum also and the fan just isn't running. If the outside fan isn't running, unless it's raining on the unit, it won't be able to reject the heat and the line sets would get warmer with each second of run time. Capacitors, for the most part, swell up when they are actually bad. With a volt ohm meter you could easily find out what the problem is if you understand how electricity works.

Watch out for capacitors they are quick release batteries that can kill under certain circumstances. That's not to scare you but just a warning. The proper way to discharge a capacitor is a 20,000 ohm resistor in between the terminals. If you wanted to get a wild hair and buy you a decent capacitor tester you'd know right off the bat. Again always discharge the capacitor before working on it because they will blow fuses in testers if you do not. Capacitors on the side of them give a +/- % that is acceptable for the μF ratings.
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Old 07-20-2009, 04:55 PM
 
3,020 posts, read 16,688,489 times
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Default Yeah, if you don't know the basics about electrics

Should never mess with it. There are real dangers. The capacitor might not kill you but sure can jolt you.

The contactors you can usually just check by pushing it in by hand with an insulated tool. Fuse puller is good.

Kinda reminds me why I always want to get the house energy envelope efficient enough to have lil or no AC. I hate the stuff, don't much like paying those high electric bills either.
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Old 08-15-2011, 05:13 AM
 
1 posts, read 145,118 times
Reputation: 24
I just fixed a friends AC by replacing the capacitor on the Condenser unit out side. $25, its fairly easy to replace MAKE SURE YOU TURN OFF ALL POWER TO THE WHOLE AC UNIT AND USE INSULATED TOOLS. Also since you will need to the numbers of the old one you may have to disconnect it first, take pictures on how the wires are connected to the top of the capacitor. Finding a place that will sell to the general public will the big issue, most places that sell it require you to have a business because they only sell resale/retail type purchases. I was lucky enough to work for a place that had a business account with them. (johnstone supply). Good luck.
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Old 07-07-2013, 11:56 PM
 
2 posts, read 70,787 times
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please help needed, I am a handy man and i can do it by my self, my inside unit is blowing worm aire, and my out side unit have humming noise and make clik noise evry 1 minit but fan unit out side not working, do you thing good possebilty could be the copacitare?
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Old 07-10-2013, 03:14 AM
 
Location: S.A., Texas ~ Home of the HUD secretary farm~
99,345 posts, read 26,299,558 times
Reputation: 135580
Quote:
Originally Posted by basselghassani View Post
please help needed, I am a handy man and i can do it by my self, my inside unit is blowing worm aire, and my out side unit have humming noise and make clik noise evry 1 minit but fan unit out side not working, do you thing good possebilty could be the copacitare?
It's a good possibility the capacitor is bad and the compressor is attempting to start. If the compressor and fan share a combination capacitor it could be bad and affecting both.
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