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Calling AC experts of the OT. AC hits setpoint, warms back to 80+, rinse and repeat

Posted on 7/18/20 at 9:53 pm
Posted by dualed
Member since Sep 2010
4692 posts
Posted on 7/18/20 at 9:53 pm
So within the past few days my home AC has gone on the fritz. A couple nights ago I noticed it was warm in the house so I looked and it was showing 81 on the thermostat while my setpoint was at 72. I just killed the power to it then brought it back online and it cooled down to the setpoint and I thought it was fine. Next morning it does the same exact thing though.

I called someone out today and it turned out I had a bunch of gunk on my coils outside from cutting grass, etc. Just basically organic debris. So he cleaned it up, tested to see if I needed any freon (I didn't) and it started cooling again. Well, just a few minutes ago the wife and I notice it was warm inside again and sure enough, its showing 79 inside.

Not sure where to go at this point. Nothing is dirty and everything checked out to the guy who came and looked at the unit earlier today. Now we did talk about the fact that my unit is currently 16 years old and only has a guaranteed life of 15 years, but he even noted how it seemed to be in good working condition.

What says the OT?
Posted by Eightballjacket
Member since Jan 2016
7314 posts
Posted on 7/18/20 at 9:55 pm to
Get window units and don't look back
Posted by Sun God
Member since Jul 2009
44874 posts
Posted on 7/18/20 at 9:55 pm to
Drain pan full in the attic?
This post was edited on 7/18/20 at 9:56 pm
Posted by WPBTiger
Parts Unknown
Member since Nov 2011
30997 posts
Posted on 7/18/20 at 9:56 pm to
Drain line clogged setting off float switch.
Posted by BuddyRoeaux
Northshore
Member since Jun 2019
2696 posts
Posted on 7/18/20 at 9:57 pm to
Take your filter out and look up at the Look up coils in the A frame to see if it’s frozen over. Turn off the compressor and run it in just fan cycle to thaw it if it is frozen over.
This post was edited on 7/18/20 at 10:01 pm
Posted by nugget
Mostly Peaceful Poster
Member since Dec 2009
13815 posts
Posted on 7/18/20 at 9:57 pm to
Could very well be a bad thermostat. If your compressor is running and you’re not low on gas, I’d replace it.
Posted by Freight Joker
Member since Aug 2019
2743 posts
Posted on 7/18/20 at 9:57 pm to
Set set point to 81

Problem solved

That’ll be $350
Posted by TROLA
BATON ROUGE
Member since Apr 2004
12330 posts
Posted on 7/18/20 at 9:58 pm to
It could easily be a malfunctioning thermostat. You can replace it for cheap to see if that’s the issue. 20-50 bucks for a new one. The wiring is easy to do..
Posted by dualed
Member since Sep 2010
4692 posts
Posted on 7/18/20 at 9:58 pm to
quote:

Drain pan full in the attic?


Dry as a bone.
Posted by sleepytime
Member since Feb 2014
3579 posts
Posted on 7/18/20 at 9:59 pm to
Yep. Drain line is probably partially clogged and takes a while for the pan to drain/reset the switch
Posted by thadcastle
Member since Dec 2019
2615 posts
Posted on 7/18/20 at 10:00 pm to
Check your drain pan. If it is not that, it could be a pressure switch on you compressor/unit. Some units when the pressure is too high/low requires a manual reset which would explain the unit working again for a little bit after a power cycle.
This post was edited on 7/18/20 at 10:01 pm
Posted by footswitch
New Market
Member since Apr 2015
3909 posts
Posted on 7/18/20 at 10:02 pm to
16 years is the problem.
Time for a new unit.
Posted by dualed
Member since Sep 2010
4692 posts
Posted on 7/18/20 at 10:03 pm to
quote:

16 years is the problem.
Time for a new unit.


I don't want to hear that solution just yet.
Posted by medtiger
Member since Sep 2003
21662 posts
Posted on 7/18/20 at 10:04 pm to
How does your house get to 81 then 79 degrees before you notice there's a problem?
Posted by dualed
Member since Sep 2010
4692 posts
Posted on 7/18/20 at 10:07 pm to
quote:

How does your house get to 81 then 79 degrees before you notice there's a problem?


We just aren't as observant to a small change in temperature I guess?
Posted by Sun God
Member since Jul 2009
44874 posts
Posted on 7/18/20 at 10:08 pm to
Did it feel like 81?
Posted by borotiger
Murfreesboro Tennessee
Member since Jan 2004
10531 posts
Posted on 7/18/20 at 10:09 pm to
Sounds like your evaporator or condenser lines are freezing.

Your HVAC guy needs (unless you have the ability) to determine if the system is telling the compressor to come on all the time.

This post was edited on 7/18/20 at 10:10 pm
Posted by dualed
Member since Sep 2010
4692 posts
Posted on 7/18/20 at 10:09 pm to
quote:

Did it feel like 81?


Yeah its definitely hotter in here. Enough to make me sweat. I don't suspect that the thermostat is showing a temperature hotter than the house actually is if that's where you're going.
Posted by PrivatePublic
Member since Nov 2012
17848 posts
Posted on 7/18/20 at 10:11 pm to
Bad compressor, keels over when running, starts back up when you power cycle it.
Posted by Sun God
Member since Jul 2009
44874 posts
Posted on 7/18/20 at 10:11 pm to
Yeah that’s where I was going.

If everything is still running, drain pan is empty, and it’s still not cooling it’s probably gonna be a pricey fix.
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