Who works on home AC?

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
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
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
I believe it eventually shuts off. I haven't noticed it on 24/7.
 

OffshoreDrilling

This is my safe space
Donating Member
Joined
Aug 28, 2007
Messages
29,146
Reaction score
132
Location
Chicago
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?
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
Turned off ac at thermostat, furnace turned off, compressor is still running
 

OffshoreDrilling

This is my safe space
Donating Member
Joined
Aug 28, 2007
Messages
29,146
Reaction score
132
Location
Chicago
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?
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
still running, if I flip the breaker it stops and wont restart until the ac kicks on again
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
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...
 

OffshoreDrilling

This is my safe space
Donating Member
Joined
Aug 28, 2007
Messages
29,146
Reaction score
132
Location
Chicago
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.
 

OffshoreDrilling

This is my safe space
Donating Member
Joined
Aug 28, 2007
Messages
29,146
Reaction score
132
Location
Chicago
i also don't work on much residential stuff, not sure what gimmicky energy savings crap they toss in units these days.
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
I was planning to turn the ac off tonight.

Just checked and the compressor is still running.
 

OffshoreDrilling

This is my safe space
Donating Member
Joined
Aug 28, 2007
Messages
29,146
Reaction score
132
Location
Chicago
I do this for a living, on infinitely more complex equipment :bowrofl: 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
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
Contactor thing seems to be the likely culprit.
 

OffshoreDrilling

This is my safe space
Donating Member
Joined
Aug 28, 2007
Messages
29,146
Reaction score
132
Location
Chicago
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.
 

10sec

I haz dat teddy bear smile.
Donating Member
Joined
Jul 26, 2008
Messages
23,339
Reaction score
113
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.
 

EmersonHart13

Member Selfie
Donating Member
Joined
Jul 18, 2007
Messages
46,809
Reaction score
891
I googled but I kept running into posts about the furnace kept running and not the compressor...
 

Create an account or login to comment

You must be a member in order to leave a comment

Create account

Create an account on our community. It's easy!

Log in

Already have an account? Log in here.

Top Bottom