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Old 08-10-2012, 01:35 PM   #1
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Just cant figure out my AC issue...


So I'm fairly handy and know how to search the internet for solutions, and I just can't seem to figure this out. I just bought myself a house and this is my first experience with central AC. The house was vacant for a while and I'm not sure when the last AC service was done. The AC unit was working wonderfully for 2 weeks. Then 2 days ago, I got to the house to work on it and the AC was not working. What I've done so far:

1. The pipes have not frozen over, I went into the crawlspace and checked the pipes.
2. I've reset the breakers inside and the breaker outside right by the condenser. The breakers are not tripped.
3. Made sure the unit is not set to just fan. The furnace fans run fine, but they are just recirculating the warm air inside the house.
4. I did some reading online, and I thought it may be the condensate pump, so I emptied the water out of the bottom and tried to reset everything, but it still isn't working. I checked the tube as much as I could and did not see a blockage along the drain line. It may be that the condensate pump is just broken, period- but I don't know how to tell that.


The outside condenser keeps trying to run, it hums for a second, but then shuts down. It does this every 15-30 min.

Does anyone have any thoughts on this? I'm hoping to try to save some money and figure this out without needing to call a repair tech out. I can purchase a new condensate pump and replace it, but didn't want spend the money to do that if I don't need to and it isn't the issue! TIA!

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Old 08-10-2012, 01:51 PM   #2
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Just cant figure out my AC issue...


test your pump by filling it with water and seeing it come on an pump the water out.

what you are describing sounds like a defective dual feed capacitor in the outside unit or a burnt wire to it. These some times can be visually checked due to if it is swelled or leaking it is bad. they are in the control panel at the outside unit. they are cylinder shaped about the size or smaller that a soda can. Could be other things as well but that is the most common failure which matches your descrip.


Last edited by turnermech; 08-10-2012 at 01:54 PM.
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Old 08-10-2012, 02:06 PM   #3
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Just cant figure out my AC issue...


Thanks for the response!

Hmm, well it was filled with water that I emptied, so if it was working it shouldn't have had water in it- right?

The DFC or burnt wire sounds a little beyond my fixing capacity and more along the lines of a repair guy
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Old 08-10-2012, 03:55 PM   #4
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Just cant figure out my AC issue...


Quote:
Originally Posted by ohsweetmadness View Post
Thanks for the response!

Hmm, well it was filled with water that I emptied, so if it was working it shouldn't have had water in it- right?

The DFC or burnt wire sounds a little beyond my fixing capacity and more along the lines of a repair guy
most condensate pumps take approx 1 gallon of water for them to come on and then pump most all of that out. you could have not had enough water to come on by its self when you dumped it.

either way the pump has no way to cause the sounds you are hearing outside. they may prevent the outside unit from running but would break the 24v signal and you would hear nothing. your noise means the unit is trying to start and can't. this would prove to me you most likely have the 24v signal.
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Old 08-10-2012, 04:54 PM   #5
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Just cant figure out my AC issue...


Time to call a tech and get the cap swapped out
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