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Old 06-03-2014, 09:42 PM   #1
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Default Who works on home AC?

My AC Compressor is staying on after my furnace turns off. The unit was installed in 2010. It's a Copeland Scroll.

Who can solve my problem?

Thanks,

John
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Old 06-03-2014, 09:50 PM   #2
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Does it ever shut off, or run continuously
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Old 06-03-2014, 09:52 PM   #3
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I believe it eventually shuts off. I haven't noticed it on 24/7.
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Old 06-03-2014, 09:56 PM   #4
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crank down the thermostat so the A/C kicks on. Go to your furnace and shut off the power. does the condensing unit still run?
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Old 06-03-2014, 10:04 PM   #5
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No, it shut off
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Old 06-03-2014, 10:06 PM   #6
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Turned off ac at thermostat, furnace turned off, compressor is still running
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Old 06-03-2014, 10:09 PM   #7
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hmm.
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Old 06-03-2014, 10:11 PM   #8
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My first suspicion was a stuck contactor on the condensing unit. Killing the furnace power shut that off though.

have a spare thermostat lying around by chance?
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Old 06-03-2014, 10:11 PM   #9
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still running, if I flip the breaker it stops and wont restart until the ac kicks on again
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Old 06-03-2014, 10:12 PM   #10
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and are there any other problems? House reaching set temp?
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Old 06-03-2014, 10:14 PM   #11
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It reaches temp, everything seems to work well enough. AC might be running a lot but that might just be my imagination as it has barely been on this year and I don't yet have a good measure of what is normal.

We get a mean afternoon sun that heats our house up really bad...
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Old 06-03-2014, 10:19 PM   #12
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Electrically, residential air conditioning is an extremely simple control system. When your thermostat calls for cooling, it closes contacts to the compressor contractor coil and indoor fan relay coil. Thats it.

My guess is your thermostat if you are actually having a problem. I don't think anything is wrong though. Your evaporator would be a solid block of ice if its running for an extremely long time without the fan on. If that was happening your house wouldn't be making temperature either. because there would be no airflow.

sleep on it, see if its still doing the same thing tomorrow when it cools off with this rain.
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Old 06-03-2014, 10:20 PM   #13
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i also don't work on much residential stuff, not sure what gimmicky energy savings crap they toss in units these days.
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Old 06-03-2014, 10:21 PM   #14
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I was planning to turn the ac off tonight.

Just checked and the compressor is still running.
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Old 06-03-2014, 10:22 PM   #15
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pull your thermostat off the wall while its running real quick
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Old 06-03-2014, 10:25 PM   #16
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Quote:
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still running, if I flip the breaker it stops and wont restart until the ac kicks on again
and was this the breaker for the furnace, or the two pole breaker for the AC unit?
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Old 06-03-2014, 10:27 PM   #17
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Google bitches, looks like Jared is spot on from google answers.

https://answers.yahoo.com/question/i...9113517AAV9179
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Old 06-03-2014, 10:30 PM   #18
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I do this for a living, on infinitely more complex equipment i hope i get some credit. I could figure this out in 30sec with a meter in person. Trying to diagnose a problem with no test instruments, and remotely is a little more finesse
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Old 06-03-2014, 10:31 PM   #19
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http://www.applianceblog.com/mainfor...t-stop-running

Googled for a long while before posting. Just tried above and removing wire did nothing.
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Old 06-03-2014, 10:32 PM   #20
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Contactor thing seems to be the likely culprit.
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Old 06-03-2014, 10:33 PM   #21
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Quote:
Originally Posted by OffshoreDrilling View Post
and was this the breaker for the furnace, or the two pole breaker for the AC unit?

AC Unit
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Old 06-03-2014, 10:34 PM   #22
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leave the AC unit breaker on, kill the one for the furnace or the switch on the furnace. If the AC unit stays running, you 100% have a bad contactor.
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Old 06-03-2014, 10:35 PM   #23
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I always go internet (google search) before I start asking people I know. Usually if you had the problem, I'm sure someone else has too, and they posted it somewhere. I had a problem with my dryer and boom, after joining a forum this God like person came from the heavens and suggested the problem I had WITH the links to the parts and a "how to" video to fix it. Spend $25 and 10 min of my time and had a perfectly good dryer. That guy is my hero.
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Old 06-03-2014, 10:36 PM   #24
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I googled but I kept running into posts about the furnace kept running and not the compressor...
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Old 06-03-2014, 10:36 PM   #25
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http://www.amazon.com/CONTACTOR-ENCL...tactor+24+volt
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