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Bruce County Boy/Snowbird
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Anyone with experience in Household A/C?



Our Carrier TKB024 2 ton A/C unit has stopped and trying to restart it just blows the Breaker. The unit outside the house with the fan just hums and no fan turns then thebreaker blows.



The unit is 17 years old and has never caused us a problem.



Any idea what is wrong? Will likely need a A/C technician to look at it.
 

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17 years old, but did you do any kind of preventative maintenance on it?

The unit only has two major parts in it, the compressor and the fan. See if the fan turns easily by hand. Unplug the fan and try to start the AC. Then unplug the compressor and see if the fan spins when power is applied. If that's good, it's likely a shorted capacitor or just the compressor is locked up.

You'll need a good meter if you want to test the capacitors, which you should do.
 

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Bruce County Boy/Snowbird
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Thanks for the advice. Will give it a try now.



We had the service people in for the Oil furnace and A/C system every 2 years. Don't know what they did, but we never had any problems before this.
 

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Sounds like what made mine go out , the compressor fan had cut a wire and would not turn on and blew the circuit breakers , my neighbor repaired the cut wire , we reset the breakers and we have ac.
I hope your's can be fixed this easy too. I don't know much about these things .
We had a capacitor go out a few years ago and the same thing.
 

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Bruce County Boy/Snowbird
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Silicon Sam wrote:
17 years old, but did you do any kind of preventative maintenance on it?

The unit only has two major parts in it, the compressor and the fan. See if the fan turns easily by hand. Unplug the fan and try to start the AC. Then unplug the compressor and see if the fan spins when power is applied. If that's good, it's likely a shorted capacitor or just the compressor is locked up.

You'll need a good meter if you want to test the capacitors, which you should do.
Fan turns freely by hand..Neither will start up..Fan tries to turn but breaker kicks in.



Thanks all.



I will call the Technician in the morning..Hopefully he gets here before we go to Nassir3
 

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Does sound like a bad start capacitor on the fan. If the cap is tested good, then the fan is suspect. If the fan is good, then it's on to the compressor. If my memory is right, the A/C units are usually expected to last about 12- 15 years with good maint. Gosh, I hope they get it fixed for you quick! jimsjinx
 

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Start capacitors are a major PITA. I'd definitely start with them.
 

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A unit that old is probably a SEERS 9 or 10 at the most, newer SEERS 15 units are out now and the Federal requirement for a replacement is a SEERS 13. Replace it and the coil inside the house, you'll be glad you did. I had to replace mine 2 years ago and it helped a lot on the electric bill. Cost me a grand total of 2600 bucks for the unit, complete with new thermostat and install fees.
 

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Yep, it does sound like a bad capacitor. Actually most use a run capacitor, the motor can't run without the phase shift provided by the cap. I had to replace one in my AC last fall. In my case it was pretty easy to find being as it had bulged quite a bit.
 

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Bruce County Boy/Snowbird
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Tech was just here. Up and running again...Bad start capcitor.

Thanks everyone for your assistance.
 

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Bagmaster wrote:
A unit that old is probably a SEERS 9 or 10 at the most, newer SEERS 15 units are out now and the Federal requirement for a replacement is a SEERS 13. Replace it and the coil inside the house, you'll be glad you did. I had to replace mine 2 years ago and it helped a lot on the electric bill. Cost me a grand total of 2600 bucks for the unit, complete with new thermostat and install fees.
A carrier 38 tkb 024 is a 10 seer. 17 yrs ago it was high seer,& yes, now 13 isthe minimum. But they do not make R22 units any more. The new stuff is R410a,which is a blend of different refrigerants that run at very high pressures,and is ozone friendlier [lol] and yes, 15seer are out, but some manufacturers claim up to 22seer. read the fine print that would be the 2ton 3ton, & may be 4ton units, so buyers beware! if you need to replace your old outdoor a/c you will have to replace the
indoor coil as well. and don't expect anything more than 13 or 14 seer if you do not upgrade your furnace and blower. Also, I always put in a new line set because the oil in the R22 is not compatible with the oil in the R410A system. Make sure they also put new line dryers in.
 

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My AC went out last week as well. Guess what, bad connection to the compressor start capacitor. Had to replace the cap and wire to the compressor.

Another band-aid for this piece of junk AC system.
 
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